False impression of positive Meckel's scintigraphy caused by ectopic cross-fused kidneys

A 3-year-old boy with a history of intermittent rectal bleeding was referred to our department for evaluation of a Meckel's diverticulum. Three foci of increased uptake were noted in the midlower abdominal region during early dynamic acquisition, but they faded in the following hour. When the patient data were reviewed retrospectively, the authors noted that Tc-99m DTPA and Tc-99m DMSA renal scintigraphic studies had been performed previously for recurrent urinary tract infections, which revealed ectopically located cross-fused kidney. The observed activity was judged to be a result of the calyces of the ectopic kidneys and therefore negative for Meckel's diverticulum.