char = N;code = 78
char = o;code = 111
char = n;code = 110
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char = e;code = 101
char = l;code = 108
char = i;code = 105
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char = l;code = 108
char = ;code = 32
char = C;code = 67
char = T;code = 84
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char = y;code = 121
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char = t;code = 116
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char = c;code = 99
char = a;code = 97
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char = l;code = 108
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char = i;code = 105
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char = i;code = 105
char = l;code = 108
char = d;code = 100
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = .;code = 46
result sql = Non-contrast thin-section helical CT of urinary tract calculi in children.
Non-contrast thin-section helical CT of urinary tract calculi in children.
char = <;code = 60
char = b;code = 98
char = >;code = 62
char = B;code = 66
char = A;code = 65
char = C;code = 67
char = K;code = 75
char = G;code = 71
char = R;code = 82
char = O;code = 79
char = U;code = 85
char = N;code = 78
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char = :;code = 58
char = ;code = 32
char = <;code = 60
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char = N;code = 78
char = o;code = 111
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char = -;code = 45
char = c;code = 99
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char = r;code = 114
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char = t;code = 116
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char = n;code = 110
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char = e;code = 101
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char = i;code = 105
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char = T;code = 84
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char = t;code = 116
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char = w;code = 119
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char = t;code = 116
char = h;code = 104
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char = t;code = 116
char = h;code = 104
char = e;code = 101
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char = t;code = 116
char = e;code = 101
char = c;code = 99
char = h;code = 104
char = n;code = 110
char = i;code = 105
char = q;code = 113
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char = <;code = 60
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char = <;code = 60
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char = P;code = 80
char = U;code = 85
char = R;code = 82
char = P;code = 80
char = O;code = 79
char = S;code = 83
char = E;code = 69
char = ;code = 32
char = :;code = 58
char = ;code = 32
char = <;code = 60
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char = b;code = 98
char = >;code = 62
char = T;code = 84
char = o;code = 111
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char = l;code = 108
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char = h;code = 104
char = e;code = 101
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char = l;code = 108
char = i;code = 105
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char = s;code = 115
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char = e;code = 101
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char = C;code = 67
char = T;code = 84
char = ;code = 32
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char = d;code = 100
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char = a;code = 97
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char = ;code = 32
char = u;code = 117
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char = c;code = 99
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char = c;code = 99
char = a;code = 97
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char = c;code = 99
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char = l;code = 108
char = i;code = 105
char = ;code = 32
char = i;code = 105
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char = i;code = 105
char = l;code = 108
char = d;code = 100
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char = .;code = 46
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char = r;code = 114
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char = >;code = 62
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
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char = <;code = 60
char = b;code = 98
char = >;code = 62
char = M;code = 77
char = A;code = 65
char = T;code = 84
char = E;code = 69
char = R;code = 82
char = I;code = 73
char = A;code = 65
char = L;code = 76
char = S;code = 83
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char = A;code = 65
char = N;code = 78
char = D;code = 68
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char = H;code = 72
char = O;code = 79
char = D;code = 68
char = S;code = 83
char = ;code = 32
char = :;code = 58
char = ;code = 32
char = <;code = 60
char = /;code = 47
char = b;code = 98
char = >;code = 62
char = R;code = 82
char = a;code = 97
char = d;code = 100
char = i;code = 105
char = o;code = 111
char = l;code = 108
char = o;code = 111
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char = y;code = 121
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char = t;code = 116
char = a;code = 97
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char = e;code = 101
char = s;code = 115
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char = t;code = 116
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = r;code = 114
char = e;code = 101
char = e;code = 101
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char = p;code = 112
char = e;code = 101
char = d;code = 100
char = i;code = 105
char = a;code = 97
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = s;code = 115
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char = a;code = 97
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char = r;code = 114
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = v;code = 118
char = i;code = 105
char = e;code = 101
char = w;code = 119
char = e;code = 101
char = d;code = 100
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char = t;code = 116
char = o;code = 111
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = m;code = 109
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char = n;code = 110
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = l;code = 108
char = i;code = 105
char = n;code = 110
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = f;code = 102
char = i;code = 105
char = r;code = 114
char = m;code = 109
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = e;code = 101
char = v;code = 118
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = u;code = 117
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = a;code = 97
char = g;code = 103
char = n;code = 110
char = o;code = 111
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = .;code = 46
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
char = <;code = 60
char = b;code = 98
char = >;code = 62
char = R;code = 82
char = E;code = 69
char = S;code = 83
char = U;code = 85
char = L;code = 76
char = T;code = 84
char = S;code = 83
char = ;code = 32
char = :;code = 58
char = ;code = 32
char = <;code = 60
char = /;code = 47
char = b;code = 98
char = >;code = 62
char = O;code = 79
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = h;code = 104
char = u;code = 117
char = n;code = 110
char = d;code = 100
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = i;code = 105
char = r;code = 114
char = t;code = 116
char = y;code = 121
char = -;code = 45
char = s;code = 115
char = e;code = 101
char = v;code = 118
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = s;code = 115
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = 1;code = 49
char = 1;code = 49
char = 3;code = 51
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = i;code = 105
char = l;code = 108
char = d;code = 100
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = (;code = 40
char = m;code = 109
char = e;code = 101
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = g;code = 103
char = e;code = 101
char = :;code = 58
char = ;code = 32
char = 1;code = 49
char = 1;code = 49
char = .;code = 46
char = 2;code = 50
char = ;code = 32
char = y;code = 121
char = e;code = 101
char = a;code = 97
char = r;code = 114
char = s;code = 115
char = );code = 41
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = u;code = 117
char = d;code = 100
char = i;code = 105
char = e;code = 101
char = d;code = 100
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = i;code = 105
char = r;code = 114
char = t;code = 116
char = y;code = 121
char = -;code = 45
char = e;code = 101
char = i;code = 105
char = g;code = 103
char = h;code = 104
char = t;code = 116
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = 9;code = 57
char = 4;code = 52
char = ;code = 32
char = e;code = 101
char = x;code = 120
char = a;code = 97
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = (;code = 40
char = 4;code = 52
char = 0;code = 48
char = %;code = 37
char = );code = 41
char = ;code = 32
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = m;code = 109
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = 8;code = 56
char = 2;code = 50
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = i;code = 105
char = l;code = 108
char = d;code = 100
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = a;code = 97
char = c;code = 99
char = u;code = 117
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = /;code = 47
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = h;code = 104
char = e;code = 101
char = m;code = 109
char = a;code = 97
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = i;code = 105
char = a;code = 97
char = ;code = 32
char = s;code = 115
char = h;code = 104
char = o;code = 111
char = w;code = 119
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = c;code = 99
char = u;code = 117
char = l;code = 108
char = i;code = 105
char = .;code = 46
char = ;code = 32
char = A;code = 65
char = l;code = 108
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = n;code = 110
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = a;code = 97
char = g;code = 103
char = n;code = 110
char = o;code = 111
char = s;code = 115
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = g;code = 103
char = g;code = 103
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = y;code = 121
char = ;code = 32
char = C;code = 67
char = T;code = 84
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = 1;code = 49
char = 6;code = 54
char = ;code = 32
char = s;code = 115
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = (;code = 40
char = 1;code = 49
char = 7;code = 55
char = %;code = 37
char = );code = 41
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = w;code = 119
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = y;code = 121
char = -;code = 45
char = e;code = 101
char = i;code = 105
char = g;code = 103
char = h;code = 104
char = t;code = 116
char = ;code = 32
char = s;code = 115
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = m;code = 109
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = 1;code = 49
char = 0;code = 48
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = y;code = 121
char = m;code = 109
char = p;code = 112
char = t;code = 116
char = o;code = 111
char = m;code = 109
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = c;code = 99
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char = c;code = 99
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char = i;code = 105
char = l;code = 108
char = d;code = 100
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = k;code = 107
char = n;code = 110
char = o;code = 111
char = w;code = 119
char = n;code = 110
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = c;code = 99
char = u;code = 117
char = l;code = 108
char = u;code = 117
char = s;code = 115
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char = d;code = 100
char = i;code = 105
char = s;code = 115
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
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char = c;code = 99
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char = n;code = 110
char = f;code = 102
char = i;code = 105
char = r;code = 114
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = o;code = 111
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = b;code = 98
char = u;code = 117
char = r;code = 114
char = d;code = 100
char = e;code = 101
char = n;code = 110
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char = o;code = 111
char = n;code = 110
char = ;code = 32
char = 2;code = 50
char = 1;code = 49
char = ;code = 32
char = s;code = 115
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = (;code = 40
char = 7;code = 55
char = 5;code = 53
char = %;code = 37
char = );code = 41
char = ;code = 32
char = a;code = 97
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char = d;code = 100
char = ;code = 32
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = s;code = 115
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = u;code = 117
char = r;code = 114
char = e;code = 101
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = c;code = 99
char = u;code = 117
char = l;code = 108
char = i;code = 105
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = 6;code = 54
char = ;code = 32
char = s;code = 115
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = (;code = 40
char = 2;code = 50
char = 1;code = 49
char = %;code = 37
char = );code = 41
char = .;code = 46
char = ;code = 32
char = U;code = 85
char = p;code = 112
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = c;code = 99
char = u;code = 117
char = l;code = 108
char = i;code = 105
char = ;code = 32
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = m;code = 109
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = 1;code = 49
char = 0;code = 48
char = ;code = 32
char = o;code = 111
char = f;code = 102
char = ;code = 32
char = 1;code = 49
char = 5;code = 53
char = ;code = 32
char = s;code = 115
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = s;code = 115
char = ;code = 32
char = (;code = 40
char = 6;code = 54
char = 7;code = 55
char = %;code = 37
char = );code = 41
char = ;code = 32
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = f;code = 102
char = o;code = 111
char = r;code = 114
char = m;code = 109
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = o;code = 111
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char = e;code = 101
char = v;code = 118
char = a;code = 97
char = l;code = 108
char = u;code = 117
char = a;code = 97
char = t;code = 116
char = e;code = 101
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char = f;code = 102
char = o;code = 111
char = r;code = 114
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = c;code = 99
char = u;code = 117
char = l;code = 108
char = i;code = 105
char = ;code = 32
char = i;code = 105
char = n;code = 110
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char = p;code = 112
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = s;code = 115
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char = w;code = 119
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char = t;code = 116
char = h;code = 104
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char = k;code = 107
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char = o;code = 111
char = w;code = 119
char = n;code = 110
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char = n;code = 110
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char = n;code = 110
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char = c;code = 99
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char = a;code = 97
char = r;code = 114
char = y;code = 121
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char = t;code = 116
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char = c;code = 99
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char = a;code = 97
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char = m;code = 109
char = a;code = 97
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char = i;code = 105
char = t;code = 116
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char = e;code = 101
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char = .;code = 46
char = <;code = 60
char = b;code = 98
char = r;code = 114
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char = >;code = 62
char = <;code = 60
char = b;code = 98
char = r;code = 114
char = /;code = 47
char = >;code = 62
char = <;code = 60
char = b;code = 98
char = >;code = 62
char = C;code = 67
char = O;code = 79
char = N;code = 78
char = C;code = 67
char = L;code = 76
char = U;code = 85
char = S;code = 83
char = I;code = 73
char = O;code = 79
char = N;code = 78
char = S;code = 83
char = ;code = 32
char = :;code = 58
char = ;code = 32
char = <;code = 60
char = /;code = 47
char = b;code = 98
char = >;code = 62
char = N;code = 78
char = o;code = 111
char = n;code = 110
char = -;code = 45
char = c;code = 99
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char = t;code = 116
char = r;code = 114
char = a;code = 97
char = s;code = 115
char = t;code = 116
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char = t;code = 116
char = h;code = 104
char = i;code = 105
char = n;code = 110
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char = s;code = 115
char = e;code = 101
char = c;code = 99
char = t;code = 116
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char = o;code = 111
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char = ;code = 32
char = h;code = 104
char = e;code = 101
char = l;code = 108
char = i;code = 105
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = C;code = 67
char = T;code = 84
char = ;code = 32
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = a;code = 97
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char = u;code = 117
char = s;code = 115
char = e;code = 101
char = f;code = 102
char = u;code = 117
char = l;code = 108
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char = m;code = 109
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char = t;code = 116
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char = o;code = 111
char = d;code = 100
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char = t;code = 116
char = o;code = 111
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char = d;code = 100
char = i;code = 105
char = a;code = 97
char = g;code = 103
char = n;code = 110
char = o;code = 111
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = u;code = 117
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = a;code = 97
char = r;code = 114
char = y;code = 121
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char = t;code = 116
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = l;code = 108
char = c;code = 99
char = u;code = 117
char = l;code = 108
char = i;code = 105
char = ;code = 32
char = i;code = 105
char = n;code = 110
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char = c;code = 99
char = h;code = 104
char = i;code = 105
char = l;code = 108
char = d;code = 100
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = .;code = 46
char = ;code = 32
char = R;code = 82
char = a;code = 97
char = d;code = 100
char = i;code = 105
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = d;code = 100
char = o;code = 111
char = s;code = 115
char = e;code = 101
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char = i;code = 105
char = n;code = 110
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char = t;code = 116
char = h;code = 104
char = i;code = 105
char = s;code = 115
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char = r;code = 114
char = e;code = 101
char = t;code = 116
char = r;code = 114
char = o;code = 111
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
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char = s;code = 115
char = t;code = 116
char = u;code = 117
char = d;code = 100
char = y;code = 121
char = ;code = 32
char = m;code = 109
char = a;code = 97
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char = e;code = 101
char = x;code = 120
char = c;code = 99
char = e;code = 101
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
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result sql = BACKGROUND : Non-contrast thin-section helical CT has gained acceptance for the diagnosis of urinary tract calculi in adults, but experience with the technique in children is limited.

PURPOSE : To evaluate the utility of non-contrast thin section helical CT for the diagnosis of urinary tract calculi in children.

MATERIALS AND METHODS : Radiology databases at three pediatric institutions were searched to identify all pediatric patients evaluated by "renal stone" protocol CT scans (no oral or intravenous contrast, scans covering the entire urinary tract obtained in helical mode with narrow collimation (< 5 mm)). CT scans were reviewed for the primary finding of urinary tract calculi, for secondary signs of acute urinary tract obstruction and for evidence of alternative diagnoses. Medical records were reviewed to determine clinical presentation and to confirm the eventual diagnosis.

RESULTS : One hundred thirty-seven scans of 113 children (mean age: 11.2 years) were studied. Thirty-eight of 94 examinations (40%) performed on 82 children for acute pain and/or hematuria showed ureteral calculi. Alternative diagnoses were suggested by CT on 16 scans (17%). Twenty-eight scans were performed on 10 asymptomatic children with known calculus disease confirming renal stone burden on 21 scans (75%) and persistent ureteral calculi on 6 scans (21%). Upper tract calculi were demonstrated on 10 of 15 scans (67%) performed to evaluate for calculi in patients with known non-calculus genitourinary tract abnormalities.

CONCLUSIONS : Non-contrast thin section helical CT is a useful method to diagnose urinary tract calculi in children. Radiation dose in this retrospective study may exceed the lowest possible radiation dose for diagnostic accuracy. Further research is needed to optimize CT imaging parameters, while maintaining diagnostic accuracy and minimizing radiation dose.

Publication: Pediatr Radiol 2002 May ;32(5)::326-32.
Publication Date: 2002 May
Study Author(s): Strouse, Peter J;Bates, D Gregory;Bloom, David A;Goodsitt, Mitchell M;
Institution: Section of Pediatric Radiology, C.S. Mott Children's Hospital, University of Michigan Medical Center, 1500 East Medical Center Drive, Ann Arbor 48109-0252, USA. [email protected]
Shortcut link to this study:
BACKGROUND : Non-contrast thin-section helical CT has gained acceptance for the diagnosis of urinary tract calculi in adults, but experience with the technique in children is limited.

PURPOSE : To evaluate the utility of non-contrast thin section helical CT for the diagnosis of urinary tract calculi in children.

MATERIALS AND METHODS : Radiology databases at three pediatric institutions were searched to identify all pediatric patients evaluated by "renal stone" protocol CT scans (no oral or intravenous contrast, scans covering the entire urinary tract obtained in helical mode with narrow collimation (< 5 mm)). CT scans were reviewed for the primary finding of urinary tract calculi, for secondary signs of acute urinary tract obstruction and for evidence of alternative diagnoses. Medical records were reviewed to determine clinical presentation and to confirm the eventual diagnosis.

RESULTS : One hundred thirty-seven scans of 113 children (mean age: 11.2 years) were studied. Thirty-eight of 94 examinations (40%) performed on 82 children for acute pain and/or hematuria showed ureteral calculi. Alternative diagnoses were suggested by CT on 16 scans (17%). Twenty-eight scans were performed on 10 asymptomatic children with known calculus disease confirming renal stone burden on 21 scans (75%) and persistent ureteral calculi on 6 scans (21%). Upper tract calculi were demonstrated on 10 of 15 scans (67%) performed to evaluate for calculi in patients with known non-calculus genitourinary tract abnormalities.

CONCLUSIONS : Non-contrast thin section helical CT is a useful method to diagnose urinary tract calculi in children. Radiation dose in this retrospective study may exceed the lowest possible radiation dose for diagnostic accuracy. Further research is needed to optimize CT imaging parameters, while maintaining diagnostic accuracy and minimizing radiation dose.
PMID: 11956719

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