Myxoma of the renal sinus: case report and literature review

Myxoma is a rare mesenchymal tumor and it is mainly seen in heart and skin.Renal myxoma is extremely rare. To date, eleven cases of kidney myxomas havebeen reported in the literature. One of them is myxoma of the renal sinus. Ourcase was an 82-year-old man admitted to our hospital symptoms related to theurinary tract obstruction. Abdominal computerized tomography revealed a solid,hypodense mass 9 cm in diameter infiltrating the renal parenchyma in the renalpelvis. The patient underwent nephrectomy. The resected kidney containedgelatinous tumor with indistinct borders. The tumor was composed of slender,bland, spindle-shaped cells with large amounts of mucoid material. Tumor cellswere positively stained with vimentin, focally stained positive for smoothmuscle actin and had negative reactivity for S-100 protein, epithelial membraneantigen and pancytokeratin. Herein we report the second case of renal myxomaarising from the renal sinus.