An exceedingly rare type of renal cyst: amoebic cyst.

A 70-year-old male patient with a history of metastatic lung cancer and type-2 diabetes mellitus presented with a complaint of right upper quadrant abdominal pain. Ultrasound showed a septated renal cyst in the right kidney. Abdominal computed tomography confirmed the presence of a septated cyst measuring 98 83mm in the right kidney with calcifications on the cyst borders (Figure 1). Indirect haemagglutination test for hydatid cyst was negative. The patient underwent percutaneous cyst treatment under ultrasound and fluroscopic guidance. During the treatment 245ml of cyst fluid was evacuated. Microbiologic evaluation of the fluid showed Entamoeba histolytica cyst and trophozoites (Figure 2). The patient denied any episode of amoebic dysentery in the past.