Myxolipoma of the renal capsule: A case report

Abstract

INTRODUCTIONAlthough lipomas are the most common mesenchymal tumors of the human body, primary intrarenal lipomas are quite rare. In this report we present a case of benign mesenchymal tumor with lipomatous and myxoid components.PRESENTATION OF CASEA sixty one years old male patient was admitted to our outpatient clinic for a general control since he had a right radical nephrectomy operation due to renal cell carcinoma (RCC) eight years ago and he did not have any urological control for last 3 years. However the urinary ultrasound revealed a mass lesion on left kidney and then on axial contrast-enhanced computed tomography (CT) scan, there were two masses on the left kidney. In the magnetic resonance imaging (MRI), the tumor on cortex was depicted as a homogeneous low-signal intensity on the T1-weighted pulse sequence and as a heterogeneous high-signal intensity on the T2-weighted pulse sequence. In pathological evaluation, the biopsy material of the cortical mass was a tumoral lesion containing lipomatous and mixoid areas without atypia, mitosis or necrosis which was diagnosed as myxolipoma.DISCUSSIONMyxolipoma, an uncommon type of lipoma, is a benign tumor composed mainly of fat cells with myxoid (mucus-like) components. In our case, the tumor was composed of mature adipocytes together with areas rich in mucoid substances and there were no malignant features including lipoblasts, mitosis or abundant capillary network.CONCLUSIONHerein we present a case of a fatty tumor originating from the renal capsule with the histologic diagnosis of myxolipoma. To the best of our knowledge, myxolipoma, a very rare form of lipoma, is not reported in kidney, in the literature before.

Curious case of myxoid adipocytic tumour with ureteropelvic junction obstruction in horseshoe kidney: dilemma in management

“…Cakiroglu et al reported on the myxolipoma of renal capsule, a form of myxoid adipocytic tumour, diagnosed on a nephrectomy specimen. Nephrectomy was done for two renal masses near the hilum 1. Another case of isolated urinary tract involvement has been reported by Chang et al , a case of primary ureteral myxolipoma.…”

Thyrolipoma. Clinical case

“…Доброкачественные неэпителиальные опухоли щитовидной железы, в том числе и тиреолипомы, встречаются крайне редко и по своему гистологическому строению не отличаются от одноименных опухолей дру-гих локализаций [1][2][3]. Микроскопически они повторяют строение зрелой жировой ткани, отличаясь некоторым полиморфиз-мом долек и клеток, между которыми встре-чаются так называемые мультиокулярные клетки [4].…”