Figure 1

(A) Magnetic resonance imaging (MRI) of the pelvis demonstrated a large mass in the urinary bladder that shows focal contrast medium enhancement on the left side with adjacent vesical wall thickening and obliteration of the lower signal intensity on T2WI. (B) Macroscopically, the urinary bladder contained a nonencapsulated, huge, and lobular mass, which was located in the left trigone and measured 14 × 13 × 7 cm in size. (C) and (D) On the cut surface, this tumor was composed of a predominant white, myofibrous-like component, and myxomatous (asterisk), hemorrhage, and tumor necrosis foci. Several hard osteochondroid-like nodules were also palpable within this tumor (arrow).