Perianal superficial CD34-positive fibroblastic tumor: A case report

Figure 1 Postoperative gross pathology. A subcutaneous tumor approximately 8 cm in diameter was observed in the perianal area.

Figure 2 Histopathological examination by hematoxylin-eosin staining (0. 45 ×). A tumor with a clear boundary was located in the upper dermis.

Figure 3 Histopathological examination by hematoxylin-eosin staining (20 ×). The tumor cells grew as mixed nodules in dense areas and sparse areas.

Figure 4 Immunohistochemical examination by the EnVision method (400 ×). A: Diffuse and strong expression of CD34 in the dense area; B: The expression of CD34 was positive in the sparse area.

Figure 5 Ultrasound image. A perianal cystic mass, which was initially considered as a perianal abscess, was observed.