Percutaneous ultrasound-guided bowel biopsy of a pseudokidney mass

A 35-year-old man was admitted to our department for weight loss, long-lasting constipation, and abdominal pain. Abdominal ultrasound (US) examination revealed a segmental wall thickening of the sigmoid colon with an ultrasound aspect of a pseudokidney lesion (70 mm in diameter) (Figure 1). The concerned bowel tract had no cleavage from the bladder. Furthermore, a thickening of the pericolic fat was detected. Computed tomography (CT) confirmed the presence of a homogeneously dense lesion of the sigmoid colon tightly connected to the bladder and suspicious for malignancy. Colonoscopy was performed and stopped at the distal sigmoid colon because of the presence of a non-ulcerated stricture. Therefore, a percutaneous US-guided bowel biopsy of the pseudokidney lesion was performed using a 21-G needle without bleeding or other complications.