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Seminal vesicle cyst with ipsilateral renal agenesis

Case contributed by Dr Chris O'Donnell

Presentation:

Pelvic pain, ? ureteric obstruction

Patient Data:

Age: 30
Gender: Male
Race: Caucasian

Well-defined hyperdense mass (HU = 50) sitting behind the bladder in the region of the right seminal vesicle.  Note absent right kidney and hypertrophied left kidney.

Modality: Ultrasound

US confirms an echolucent lesion behind the bladder with posterior acoustic enhancement indicative of a cyst - note no blood flow on colour Doppler analysis.  No kidney in the right renal fossa.

Case Discussion:

These seminal vesicle cysts occur as a result of maldevelopment in the distal mesonephric duct and absence of the ureretic bud.  This causes renal agenesis and obstruction to the seminal vesicle and secondary cyst formation due to atresia of the ejeculatory duct.

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