Unusual retrovesical cystic mass in a male patient.

Primary tumors of the seminal vesicles are very rare, with most reported cases being malignant. Benign tumors of the seminal vesicles are even rarer. A spectrum of tumors is derived from both epithelium and stroma and constitutes a distinct subset termed "epithelial-stromal tumors." We present the classic imaging findings of a cystadenoma of the seminal vesicles in a 23-year-old man, who presented with lower abdominal pain and obstructive urinary symptoms. Crown