Dangle-shaped gallbladder extended to the pelvic cavity in a [99mTc]Tc-MDP SPECT/CT bone scan

A bone scan was performed on a 69-year-old man with small cell lung carcinoma (limited stage) following 2nd course of adjuvant chemotherapy using etoposide and cisplatin demonstrating extra-osseous tracer accumulation in the right lower abdominal cavity originally thought to be in the ascending colon, was proven to be an ectopically located gallbladder extending to the right lower quadrant (RLQ). Otherwise, the bone scan did not show abnormal skeletal uptake. The precise reason for gallbladder excretion of [99mTc]Tc-MDP derivatives is unknown. None of the other patients injected with the same [99mTc]Tc-MDP kit demonstrated any gallbladder or other abnormal soft tissue tracer accumulation. In the interpretation of non-osseous uptakes in the right abdominal cavity, ectopic and/or abnormal shaped gallbladder should be taken into consideration.