Renal hydatid cyst

Case contributed by Dr MT Niknejad

Presentation

Known and operated case of hepatic hydatid cyst. Left flank pain. Hematuria and hydaturia reported on recent urine analysis.

Patient Data

Age: 45 years
Gender: Male
CT

A 58 mm thick-walled multiloculated cystic lesion with fine mural and septal calcifications is noted at the lower pole of the left kidney that bulges into the collecting system. 

Postoperative changes are seen due to hydatid cystectomy (regarding patient history) at the right liver lobe. Focal coarse calcification and a few small cyst-like lesions are noted at the surgical site.

The gallbladder is not seen at the anatomical location due to prior resection.

The prostate gland is mildly enlarged. 

Case Discussion

The patient underwent left renal cyst resection, and histopathology evaluation confirmed renal hydatid cyst

CT scan is a sensitive modality for diagnosing renal hydatid cyst and shows a unilocular or multilocular cyst with or without peripheral calcification. CT scan may also indicate a detached membrane and daughter cysts with lower density than the maternal matrix.

It should be noted that hydaturia is a pathognomonic sign of renal hydatidosis.

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