Splenosis mimicking tumor recurrence in renal cell carcinoma: detection on selective spleen scintigraphy.

A 2-year-old boy had been operated on for a giant renal cell carcinoma including splenectomy because of disrupture of the splenic capsule. During a follow-up examination, 3 nodules were detected by ultrasound in the splenorenal area. This gave reason to suspect tumor recurrence. Considering the possibility of splenosis, a selective spleen scan using denatured red blood cells was performed as a final diagnostic step. This method confirmed the nodules as representing splenic tissue. Splenosis should be included in the differential diagnosis of solid masses in the postsplenectomy patient.