Presentation
Examined for perineal pain.
Patient Data
Age: 35 years
Gender: Male
From the case:
Seminal vesicle cyst with ipsilateral renal agenesis



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The sonogram shows a hypoechoic cystic mass, 4.0 cm at greatest diameter, approaching the posterior aspect of the right seminal vesicle. Note the lack of the right kidney in the renal fossa. Hypertrophy of the left kidney.
Case Discussion
The differential diagnosis of cystic pelvic masses in the male includes tumor, abscess, large ectopic ureterocele, lymphangioma, lymphocele, Müllerian duct cysts and ejaculatory duct cysts, both of which are midline in location.