INTRODUCTION: Although 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 CASE: A 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.
DISCUSSION: Myxolipoma, 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.
CONCLUSION: Herein 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.
Written by:
Cakiroglu B, Tas T, Esen T, Ates L, Aksoy SH. Are you the author?
Hisar Intercontinental Hospital Department of Urology, Umraniye, Istanbul, Turkey; Taksim Training and Research Hospital Department of Urology, Istanbul, Turkey; Koc University Medical School Department of Urology, Istanbul, Turkey. 4Hisar Intercontinental Hospital Department of Pathology, Umraniye, Istanbul, Turkey; Hisar Intercontinental Hospital Department of Radiology, Umraniye, Istanbul, Turkey.
Reference: Int J Surg Case Rep. 2015;6C:48-50.
doi: 10.1016/j.ijscr.2014.09.011
PubMed Abstract
PMID: 25524301