Case Report

A Case of Renal Hydatid Cyst Mimicking a Non-opaque Kidney Stone


  • Ümit Gül
  • Mehmet Vehbi Kayra

Received Date: 02.01.2017 Accepted Date: 01.03.2017 J Urol Surg 2018;5(1):37-38

Hydatid cyst is an endemic disease in several regions of the world. Renal involvement is rare. Association with kidney stones is even less likely. We report a case with isolated renal hydatid disease mimicking a non-opaque kidney stone.

Keywords: Cystic hydatid,Kidney stone,Treatment


Hydatid cyst, which is a parasitic infestation caused by Echinococcus granulosus leading to hydatid disease, is endemic in several regions of the world. It maintains its importance as a common health problem in this region. Although mainly the liver and lungs are affected, the kidney and other organs are involved in 2-4% of cases. Isolated renal involvement is rare and coexistence with kidney stones is also extremely rare (1,2,3). We assume that this report of the case of hydatic cyst mimicking a non-opaque kidney stone will contribute to the literature.

Case Presentation

Written informed consent was obtained from the patient. A 26-year-old female patient was admitted to the urology clinic with right flank pain. The patient had a history of ureterorenoscopy and stone manipulation for right ureteral stones. Her physical examination was normal except for right costovertebral angle tenderness. Urinalysis revealed a large number of erythrocytes and leukocytes. Urine culture for bacterial pathogens revealed no microorganism growth. Dense fluid adjacent to the lower pole of the right kidney was observed on ultrasonography. Two cystic lesions with thick septa were observed in the upper pole, one being 27x19 mm and the other 23x13 mm in diameter. There were multiple stones in the renal pelvis reaching a diameter of 12 mm. No clear urinary tract calculus image was detected on the X-ray view of the kidney poles. Staghorn calculi were observed in the right kidney on stone protocol computed tomography scans (Figure 1a, 1b). The total stone  size was measured as 55x24x18 mm on computed tomography. The patient underwent percutaneous nephrolithotomy operation. Upon entry into the collecting system, a necrotic membranous structure filling the collecting system was found. This formation was totally cleaned with a foreign body forceps (Figure 2). No intraoperative hemodynamic instability was seen. The operation was completed after insertion of a 16F nephrostomy tube. Pathological examination of the excised material revealed intense calcification over lamellar hyalinized cystic structures and although no daughter vesicles or germinative membrane were reported, the case was diagnosed as hydatid cyst. There were no other foci in whole body scans. Indirect hemagglutination test was negative. Albendazole 400 mg/day was started after consultation with the department of infectious diseases.


The most common symptom of renal hydatid disease is abdominal and lumbar pain, however, palpable mass, hematuria, and fever are also observed. Determination of daughter cysts and cyst wall layers in the urine are diagnostic. This occurs with the opening of the cyst to the collecting system and has been reported in 5% to 28% of patients (4,5). There are no pathognomonic serological and immunological tests for renal hydatid disease. Imaging studies play a pivotal role in the diagnosis. Unilocular and multilocular cysts are observed on ultrasonography. Further evaluation with computed tomography can be used to identify calcification and daughter cysts. Isolated intrarenal hydatid cyst is a very rare disease. Radiological evaluation plays important role in diagnosis. However, the diagnosis of the disease cannot be usually achieved in the preoperative period since there is no specific laboratory finding. Treatment of renal hydatid cysts is the surgical excision of the cyst however, several percutaneous methods are also available. Surgical treatment alternatives are total cystectomy, pericystectomy, partial cystectomy, and total or partial nephrectomy. The cyst should be removed without rupture to reduce the possibility of planting. Allergic reactions, anaphylaxis, and even death may be seen because of intraoperative cyst rupture resulting in spilling of cystic material into the operative field. The kidney should be isolated from the surroundings using betadine-soaked sponges and hypertonic saline; 2% formalin, 1% iodine or 0.5% silver nitrate should be administered to the cyst cavity. Albendazole treatment may be used pre- and post-operatively in order to prevent recurrence. Cystic material was filling the renal collecting system in our patient. The patient did not have any symptoms other than pain. She did not define urinary excretion of cystic formations. Ultrasonography revealed septal cysts and renal pelvic calculi. Computed tomography showed a staghorn calculi image. The patient underwent percutaneous nephrolithotomy operation. Necrotic membranous formations seen upon entry into the collecting system were totally cleaned with foreign body forceps. Albendazole was started postoperatively at a dose of 400 mg/day. The treatment lasted for 3 months. The patient is being followed without problems in the first year after surgery.


Informed Consent: Written informed consent was obtained from patients who participated in this study.

Peer-review: Externally peer-reviewed.

Authorship Contributions

Surgical and Medical Practices: Ü.G., M.V.K., Concept: Ü.G., Design: Ü.G., Data Collection or Processing: M.V.K., Analysis or Interpretation: Ü.G., M.V.K., Writing: Ü.G.

Conflict of Interest: No conflict of interest was declared by the authors.

Financial Disclosure: The authors declared that this study has received no financial support.


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