Fig. 2From: Soft tissue perineurioma involving the kidney: a report of two cases with an emphasis on differential diagnosisMicroscopically, the tumor was unencapsulated with focally entrapped benign renal tubules (A). The tumor cells were arranged in interwoven fascicles or storiform patterns in a myxoid to collagenous matrix (B, C). The tumor cells were elongated, spindle-shaped cells with ovoid to tapering, bland-appearing nuclei (D)Back to article page