CD34 and neoplasm: Core needle biopsy (CNB) showed fibroedematous stroma with hemorrhage infiltration of neutrophils and lymphocytes, and hyperplasia of short spindle cells. The immunohistological staining of the spindle cells revealed a negative result for S-100 and a positive result for Cluster of differentiation 34 (CD34), with focal distribution (Figure 3). There were no obvious malignant findings, and the tumor was diagnosed as a benign tumor, such as reactive tissue with coagulation necrosis.