Background: The rate of renal involvement in pediatric acute lymphoblastic leukemia (ALL) at diagnosis varies between reports because renal involvement is diagnosed on renal size larger than aged-matched standards on conventional modalities. We propose a new method for precise renal involvement detection using 3-D enhanced computed tomography (CT) reconstruction.
Methods: Twenty-five children with ALL were evaluated utilizing 3-D enhanced CT reconstruction to measure renal volume before and after induction therapy, renal mass lesions and renal axis at diagnosis. Renal involvement was defined as a marked decrease of renal volume or the presence of mass lesions.
Results: According to the 3D-CT criteria, nine of 25 patients (36%) had renal involvement. All of them had bilateral mass lesions except for one who had diffuse nephromegaly alone. This method detected renal involvement more accurately than ultrasonography. When using conventional criteria based on the length of the renal axis, 19 of 25 (76%) had renal involvement, including many cases of false-positive nephromegaly. Patients with renal involvement had significantly more extramedullary involvement according to the 3D-CT-based criteria.
Conclusions: The use of 3D-CT reconstruction was accurate in detecting renal involvement in childhood ALL, most of which consisted of piled up mass lesions. Patients with renal involvement should be worked up for the detection of other extramedullary lesions.
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