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Important Notice

Case report
Year : 2022 | Month : May | Volume : 16 | Issue : 5 | Page : TD04 - TD07 Full Version

Role of Imaging in the Diagnosis of Isolated Renal Echinococcosis: A Case Report

Published: May 1, 2022 | DOI:
Kalidindi Valli Manasa, Satish D Patil, Anil G Joshi

1. MBBS, Department of Radio-diagnosis, Shri B.M. Patil Medical College and Research Centre, Vijayapura, Karnataka, India. 2. Associate Professor, Department of Radio-diagnosis, Shri B.M. Patil Medical College and Research Centre, Vijayapura, Karnataka, India. 3. Professor, Department of Radio-diagnosis, Shri B.M. Patil Medical College and Research Centre, Vijayapura, Karnataka, India.

Correspondence Address :
Dr. Kalidindi Valli Manasa,
MBBS, Department of Radio-diagnosis, Shri B.M.Patil Medical College
and Research Centre, Vijayapura, Karnataka, India.


Echinococcosis is a parasitic infection caused by Echinococcus tapeworm. The most common organs involved are liver, lungs and spleen. Primary renal echinococcosis is a very rare manifestation of hydatid disease. Clinical manifestations in primary renal echinococcosis are variable and can have varied symptomatologies which are non specific. A 62-year-old female patient presented with abdominal fullness since six months, palpable mass and left flank pain since three months. On imaging, a large multiloculated cyst and multiple peripherally situated daughter cysts involving the middle and lower pole of left kidney with gross dilatation of upper pole calyx with severe cortical thinning was noted. It usually presents as a cystic renal mass on imaging and often gets misdiagnosed and operated as a cystic renal malignancy. Hence, radiological imaging plays an important role and care should be taken when dealing with a cystic renal mass to avoid unnecessary nephrectomies.


Echinococcus infection, Hydatid cyst, Kidneys, Nephrectomy

Case Report

A 62-year-old female patient presented to Out Patient Department (OPD) with complaints of abdominal fullness since six months, palpable mass and left flank pain which was dull aching type since three months. On per abdomen examination, there was a large non tender mass filling the left hypochondrium, left lumbar and umbilical regions which are firm in consistency and measuring approximately about 10x9 cm. No history of weight loss and cachexia. No evidence of significant lymphadenopathy. Systemic examination otherwise shows no significant abnormality. No significant family history noted.

On ultrasound abdomen, a thin-walled cystic lesion (Table/Fig 1),(Table/Fig 2) giving posterior acoustic enhancement measuring about 12×12 cm involving mid and lower pole of left kidney with multiple daughter cysts within giving ‘cyst within cyst’ appearance was noted (Table/Fig 2). On colourdoppler imaging, the cyst wall showed minimal vascularity (Table/Fig 3).

On non contrast computed tomography: Left kidney was enlarged in size with evidence of a large well defined thin walled multiloculated hypodense cystic lesion measuring about 12 cm × 10 cm × 12 cm with multiple daughter cysts and septations within giving ‘Cart-Wheel appearance’ causing architectural distortion was noted involving the middle and lower pole of left kidney (Table/Fig 4). The lesion was causing expansion of the perinephric space and obliteration of anterior pararenal space, however posterior para-renal space was relatively preserved (Table/Fig 5),(Table/Fig 6). No evidence of calcific foci noted within.

The mass was seen medially crossing the midline and displacing the aorta and Inferior Vena Cava (IVC), laterally it was displacing lateral conal and transversalis fascia, anteriorly the mass was seen displacing gerota’s fascia and parietal peritoneum, posteriorly displacing zuckerkandl’s fascia, superiorly displacing body and tail of pancreas, splenic vessels, inferiorly it is seen displacing small bowel loops and descending colon.

Gross dilatation of upper pole of the calyx was noted with severe cortical thinning measuring about 5 mm. Sudden abrupt narrowing of the distal ureter was noted for a length of 1.5 cm causing gross hydroureter – possibly due to inflammatory stricture (Table/Fig 6).

On contrast enhanced computed tomography: On postcontrast study, the lesion shows minimal enhancement of peripheral capsule and internal septations (Table/Fig 7),(Table/Fig 8),(Table/Fig 9). Upper pole of left kidney shows excretion of contrast on delayed phases (Table/Fig 10).

A provisional diagnosis of ‘Infective aetiology- likely Renal echinococcosis’ was given with a possible differential to be considered as cystic renal malignancy.

Patient was put on bi-imidazoles 400 mg twice daily for four weeks duration as a measure to prevent spillage and anaphylaxis during surgery. Partial nephrectomy was performed, at which the cyst was removed en bloc. Patient was put-on three-month course of albendazole 200 mg twice daily and advised for a follow-up ultrasound after three months.

Gross specimen shows: Incised cystic mass with multiple smaller, smooth-walled daughter cysts, which were filled with translucent fluid (Table/Fig 11).

On Histopathological examination cyst showed a thin inner germinal layer, middle laminated layer and an outer adventitial layer. Parasitic membranes were obvious in most examined sections, some were continuous and intact containing brood capsules with protoscolices (Table/Fig 12).

Hence, a final diagnosis of renal echinococcosis was made: Postoperative period was uneventful, and patient came for follow-up after two months and an ultrasound was done which was normal (Table/Fig 13).


Primary renal hydatid disease is a zoonotic disease which is caused by ingestion of the parasitic eggs through contaminated food, water, soil, or through direct contact with animals. Parasite generally crosses duodenal mucosa and renal involvement occurs due to haematogenous spread. Renal hydatid does not show specific signs or symptoms and is very rarely involved compared to that of liver or spleen (1). Patients present with non specific symptoms like palpable mass in case of large cysts, flank pain, hydatiduria, malaise, and fever (2). In present study, patient presented with complaints of chronic left flank pain, palpable mass and fullness.

Serology plays a less important role in diagnosis of hydatid disease due to high false negative results (3). Imaging plays an important and major role in diagnosing as well as staging of renal hydatid cyst. Ultrasound demonstrates large thin-walled cyst with multiple daughter cysts within giving ‘cyst within cyst’ appearance (4), floating membranes and hydatid sand. The Gharbi ultrasound classification of cystic echinococcosis (5) consists of five stages: homogeneously hypoechogenic cystic thin-walled lesion (stage 1), septated cystic lesion (stage 2), cystic lesion with daughter lesions (stage 3), pseudo-tumour lesion (stage 4) and calcified or partially calcified lesion -inactive cyst (stage 5). This lesion falls into stage 3 Gharbi ultrasound classification of cystic echinococcosis.

Computed tomogram is a more sensitive imaging modality to look for daughter cysts, calcifications, intracystic gas and for anatomical localisation. CT demonstrates a large thin walled cystic lesion with multiple peripherally placed daughter cysts and septations within giving ‘Cart-wheel appearance’. The lesion may show minimal enhancement of capsule and septations on postcontrast study (6).

In general, surgery is the treatment of choice for large renal hydatid cysts (7). If a preoperative diagnosis of hydatid cyst is made, the surrounding area around the cyst must carefully be isolated by gauze packs, aspiration of the cyst must be done and the cystic fluid must be replaced with scolicidal agent. Another technique is called partial cysto-pericystectomy where the cyst along with the hydatid membrane and daughter cysts are removed with scolicide-soaked swabs (8). Remnant pericystic margin is then sutured. Usually, nephrectomy must be reserved for a non functioning kidney only. So, in case of small cysts, focal or partial resection would be a better option. World Health Organisation (WHO) Informal Working Group on Echinococcosis (WHO-IWGE)-2010 classification system (5) based treatment is used for cystic echinococcus infection. Active lesions need surgical intervention or Percutaneous Aspiration, Injection and Reaspiration (PAIR) + medical management due to risk of spread. However, PAIR is usually avoided due to risk of peritoneal seeding. Inactive lesions need monitoring. Surgical management includes extraperitoneal partial or total nephrectomy. Laparoscopic nephrectomy is avoided as it carries risk of cyst rupture and incomplete removal of the hydatid cyst.

Complete nephrectomy is reserved for non functioning kidneys. Medical management includes administration of albendazole (5-7 mg/kg twice daily) in combination with PAIR and is reserved for non operable cases. Preoperatively to make the cysts less tense three cycles of bi-imidazoles of four weeks duration two weeks apart should be given to prevent spillage and anaphylaxis. To prevent recurrences three months course of albendazole should be given postoperatively.

Few of the recent case reports published in the literature on isolated renal Echinococcus stress upon the possibility of isolated renal hydatid disease getting misdiagnosed and operated as cystic renal tumours (9), however most of these studies used a single imaging modality to describe its characteristics (10). It is important to be familiar with the radiological signs and imaging features, which are clearly described in this case report using various modalities like ultrasound, colour Doppler imaging, non enhanced CT and contrast enhanced CT. All the typical features of renal hydatid disease like large multiloculated thin-walled cystic lesion with multiple daughter cysts giving ‘cart-wheel appearance’ and daughter cysts with low density content than the maternal matrix have been described in this case report.However, the limitation of this case report was, there was no Diethylenetriamine Pentaacetic Acid (DTPA) scan done prior to planning the partial nephrectomy to assess residual kidney function adequately.

Renal echinococcosis can mimic few cystic renal malignancies and there are reported cases of preoperative misdiagnosis especially in non endemic areas (11). Hence, care should be taken while dealing with cystic renal lesions and avoid unnecessary nephrectomies.


Primary renal echinococcosis is a very rare manifestation of hydatid disease, which presents as a cystic renal mass on imaging and often gets misdiagnosed and operated as a cystic renal malignancy. Hence, care should be taken and echinococcosis should be considered as a differential when dealing with a cystic renal mass to avoid unnecessary nephrectomies.


Kumar SA, Shetty A, Vijaya C, Geethamani V. Isolated primary renal echinococcosis: A rare entity. International Urology and Nephrology. 2013;45(3):613-16. [crossref] [PubMed]
Cappello E, Cacopardo B, Caltabiano E, Volsi SL, Chiara R, Sapienza M, et al. Epidemiology and clinical features of cystic hydatidosis in Western Sicily: A ten-year review. World Journal of Gastroenterology: WJG. 2013;19(48):9351. [crossref] [PubMed]
Nail LC, Reimundes ER, Galluzzo CW, Lebowitz D, Ibrahim YL, Lobrinus JA, et. al Disseminated alveolar echinococcosis resembling metastatic malignancy: A case report. Journal of Medical Case Reports. 2017;11(1):01-06. [crossref] [PubMed]
Chaouch MA, Dougaz MW, Cherni S, Nouira R. Daughter cyst sign in liver hydatid cyst. Journal of Parasitic Diseases. 2019;43(4):737-38. [crossref] [PubMed]
WHO Informal Working Group. International classification of ultrasound images in cystic echinococcosis for application in clinical and field epidemiological settings. Actatropica. 2003;85(2):253-61. [crossref]
Mehta P, Prakash M, Khandelwal N. Radiological manifestations of hydatid disease and its complications. Tropical Parasitology. 2016;6(2):103. [crossref] [PubMed]
Singh V, Devana SK, Gorsi U, Bal A. Isolated renal hydatid cyst masquerading as cystic renal tumor. Urology. 2019;133:e11-12. [crossref] [PubMed]
Pakala T, Molina M, Wu GY. Hepatic echinococcal cysts: A review. Journal of Clinical and Translational Hepatology. 2016;4(1):39. [crossref] [PubMed]
Mohamed I, Tarik M, Mohammed A, Alaoui W, Abdelghani O, Ali B, et al. Primary hydatid cyst looked like renal cell carcinoma: Case report. Journal of Surgical Case Reports. 2020(9):1-3. [crossref] [PubMed]
Hamamci EO, Besim H, Korkmaz A. Unusual locations of hydatid disease and surgical approach. ANZ Journal of Surgery. 2004;74(5):356-60. [crossref] [PubMed]
Alqasem S, Alqurmalah S, Alsahn B, Ahmed A, Moazin M, Alfakhri A, et al. Unilocular huge renal hydatid cyst mimicking simple cyst: A rare case report. Urology Case Reports. 2020;31:101165. [crossref] [PubMed]

DOI and Others

DOI: 10.7860/JCDR/2022/51916.16315

Date of Submission: Aug 15, 2021
Date of Peer Review: Oct 29, 2021
Date of Acceptance: Feb 11, 2022
Date of Publishing: May 01, 2022

• Financial or Other Competing Interests: None
• Was informed consent obtained from the subjects involved in the study? Yes
• For any images presented appropriate consent has been obtained from the subjects. Yes

• Plagiarism X-checker: Aug 18, 2021
• Manual Googling: Feb 09, 2022
• iThenticate Software: Feb 18, 2022 (10%)

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