PMC2811309_01
Magnetic resonance image demonstrates a 3.0x2.5 cm size solid mass with mildly enhancement on left kidney lower pole with a central necrotic portion.
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F1
T2-weighted MRI demonstrated a mildly hyperintense lesion, possibly renal cell carcinoma (Fig. 1).
Left kidney coronal opening specimen shows a well-circumscribed encapsulated mass measuring 2.7x2.8 cm size, involving the lower pole. The mass revealed areas of myxoid change necrosis, and cystic change.
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F2
The tumors were well encapsulated with dense collagenous fibrous tissue (Fig. 2).
Microscopic findings. (A) The low power appearance demonstrating a capsule of dense collagenous fibrous tissue and myxoid zone and inflammation with cellular zone consisting of spindle cells arranged in fascicles. (B) The area of myofibroblastic proliferation showing densely cellular fascicles. The tumor cells were potive for smooth muscle actin (C) and vimentin (D).
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F3
Histologic examination of the tumor revealed spindle cells with myxoid change admixed with lymphocytes, and plasma cells (Fig. 3A, B). The spindle cells were diffusely positive for vimentin, and focally positive for both actin and epithelial membrane antigen (EMA) (Fig. 3C, D).