A Rare Case of a Solitary Fibrous Tumor of the Spermatic Cord

Abstract

Solitary fibrous tumors (SFTs) are rare mesenchymal tumors, originally identified in the pleura. Even though they have subsequently been described in several extrapleural sites, the incidence of SFTs in the spermatic cord is particularly rare. Here, we report a case of a 27-year-old male that presented with a 3-year history of left scrotal swelling. Computed tomography (CT) and ultrasound demonstrated multiple solid, hypoechoic well-circumscribed masses that were separate from the testis. Surgical excision of the mass led to pathologic diagnosis of a solitary fibrous tumor involving the spermatic cord. Solitary fibrous tumors, although rare, are an important differential diagnosis for urogenital tumors.

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“…While CD34 and Bcl-2 have high sensitivity for the detection of SFT [ 13 ], the presence of the NAB2-STAT6 fusion gene is the most specific marker [ 14 ]. Benign SFTs are negative for CD117, desmin, smooth muscle actin, S100 protein, and inhibin, although malignant SFTs have been shown to be positive for S100, cytokeratin, vimentin, and p53 mutations as well [ 8 ]. This particular SFT was considered to be low-risk and nonmalignant due to small size (approximately 2 cm) and benign histology, including no appreciable mitotic figures.…”