Retroperitoneal haemangiopericytoma.

A 55-year-old woman, diagnosed with a renal mass by abdominal ultrasonography (USG) in an external medical centre, presented to our hospital. The medical history was unremarkable except for diabetes mellitus and hypertension. The haemogram and urine tests were normal. The only pathology revealed in routine biochemistry tests was increased glucose level (164 mg/dL). The repeat USG performed in our hospital revealed a solid hypoechoic mass lesion approximately 4 cm in diameter closely adjacent to the right kidney. At Doppler ultrasonography, the tumour demonstrated intense vascularisation. An abdominal CT scan was performed to characterise the lesion. The CT scan revealed a 42Ã-39 mm mass lesion with regular contours adjacent to the right kidney. In the arterial phase, the tumour demonstrated intense enhancement and in the delayed phase the images showed washout (figure 1). The patient underwent surgery and after histopathological examination retroperitoneal haemangiopericytoma was diagnosed and no relapse or distant organ metastasis was detected throughout the 2-year follow-up.