Cystic malformation of the seminal vesicle is rare congenital urogenital tract anomaly. It can be isolated anomaly. It can be associated with other urinary tract anomalies. Clinical presentation may be extremely variable. In symptomatic patients surgical intervention is required so radiological features and clinical aspects are very important for patient's management. CASE REPORT: A 32 yr male patient was admitted with complaints of dysuria, frequency of micturition and intermittent febrile

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... odes since last two months. A long course of antibiotics was given to him with clinical diagnosis of urinary tract infection. At the time of admission urine examination was normal. Per rectal examination revealed a firm mass located just superior to the prostate. Ultrasound of the abdomen and pelvis was performed which revealed absence of right kidney and hypertrophy of contralateral kidney which was also malrotated and improperly ascended. There was a cystic lesion at the anatomical site of seminal vesicle which is not seen separately, the prostate also appeared smaller in size. Transrectal ultrasound was performed for further characterization which revealed a large tubular cystic lesion entirely replacing the seminal vesicle. There was no solid component. The prostate was well visualized however it was smaller in size. Patient was further investigated with IVU, CT scan and MRI. Intravenous urography revealed absent right kidney and compensatory hypertrophy of left kidney. Left kidney was malrotated and incompletely ascended however it showed prompt and normal excretion. The left ureter and urinary bladder were normal. Plain and post intravenous contrast CT scan of the abdomen was performed. There was hypodense mass lesion of water attenuation in the pelvis at the bladder base more to the right side with non visualization of the seminal vesicles separately. There was no contrast enhancement. Plain MRI was performed using dedicated pelvic coil on 1.5 T GE units. Axial, coronal and sagittal T1W and T2 W sequences were performed. It showed a tortuous tubular structure of fluid signal intensity entirely replacing the seminal vesicles. It measured approximately 8x7x6 cms in size. There was no solid component. The prostate was small in size however appeared normal in morphology and signal characteristics. The rest of the pelvic structures were normal. So based on the imaging findings diagnosis of congenital cystic anomaly of the seminal vesicle was made.