A 17-year-old boy presented with fatigue, hypoxia, palpitations, and anemia (hemoglobin 3.5 g/dL). The search for the etiology of the bleeding began with a Meckel scan. A photopenic region in the gastric body and a region of abnormal tracer uptake in the right midabdomen were unexpected findings. Further investigation with ultrasound and computed tomography revealed a gastric mass, which proved to be a gastrointestinal stromal tumor at pathology. The right-sided tracer uptake resulted from stasis in the collecting system of a malpositioned right kidney, a cause of false uptake in a Meckel scan.