Adult polycystic disease of kidneys: a potential cause of false-positive 67Ga images.

A 56-year-old man with adult polycystic disease of the kidneys complicated by renal failure, hypertension, and bacteremia underwent bilateral nephrectomy because the enlarged kidneys compromised his gastrointestinal function and respiratory capacity. A scan using 99mTc-methylene diphosphonate demonstrated nonfunctioning kidneys, bilaterally. An unusual radioactivity pattern in the bowel in 67Ga scintigraphy was due to extreme renal enlargement and should be kept in mind to avoid misinterpretation.