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Case Reports
. 2018;27(3):297-300.
doi: 10.1159/000488878. Epub 2018 Mar 29.

Isolated Renal Hydatid Cyst Misdiagnosed and Operated as a Cystic Renal Tumor

Rabea A Gadelkareem  1 , Ayman A Elqady  1 , Sayed K Abd-Elshafy  2 , Hisham Imam  3 , Hassan A Abolella  1
Affiliations
Case Reports

Isolated Renal Hydatid Cyst Misdiagnosed and Operated as a Cystic Renal Tumor

Rabea A Gadelkareem et al. Med Princ Pract. 2018.

Abstract

Objective: The aim of this work is the presentation of a case of isolated renal hydatid cyst with novel findings and an unusual surgical scenario.

Clinical presentation and intervention: A 54-year-old female patient presented with left loin pain and a palpable left renal mass. Imaging described a well-demarcated left renal cystic lesion with a double-layer wall. Radical nephrectomy was performed due to the possibility of malignancy. On retrograde revision, the double-layer wall represented the detached germinative membrane of a hydatid cyst that was confirmed by histopathology.

Conclusion: Isolated renal hydatid cyst could be misinterpreted as a renal tumor. It should be considered in the differential diagnosis of renal cystic lesions.

Keywords: Cystic renal tumor; Echinococcus granulosus; Renal hydatid cyst; Renal pseudotumor.

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Figures

Fig. 1
Fig. 1
Abdominal computed tomography coronal view: a unilocular cyst involving major parts of the left kidney with a double-contour appearance.
Fig. 2
Fig. 2
Magnetic resonance imaging of the abdomen. a Transverse view showing the large cyst occupying great parts of the left kidney with a double-layer wall. b Diffuse-weighted study showing internal signals that were misinterpreted as intramural hemorrhage.
Fig. 3
Fig. 3
Cut-surface of the left kidney showing a well-formed huge unilocular cyst filled with a detached folded whitish germinative membrane.
Fig. 4
Fig. 4
Histopathological overview of the renal hydatid cyst. a Low-power view of the histology of inner scolices forming and the thick outer layer of the hydatid cyst. HE stain. Original magnification ×40. b Histology of the wall of the hydatid cyst with a characteristic chitinous layer admixed with inflammatory cells. HE stain. Original magnification ×100. c High-power view of layers of hydatid cyst admixed with plenty of eosinophils. HE stain. Original magnification ×400. d Kidney parenchyma adjacent to the hydatid cyst exhibits chronic pyelonephritis. HE stain. Original magnification ×100.
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