Prenatal ultrasound diagnosis of congenital infantile fibrosarcoma and congenital hemangioma: Three case reports

Figure 6 Pathological findings of the congenital infantile fibrosarcoma in Case 1. A: H&E staining image. The tumor cells showing eosinophilic, diffuse sheets of monotonous round cells with fine chromatin, and indistinct nucleoli; B-D: Immunochemistry demonstrated the expression of smooth muscle actin, CD34, and CD31 in the tumor cells; E: The immunochemical study showed that the Ki-67 proliferation index was approximately 20%; F: Using fluorescence in situ hybridization, the tumor cells showed NTRK3 gene rearrangement, with break-apart green (telomeric) and red (centromeric) signals (white arrows).