Figure 3
From: Diagnosis and management of retroperitoneal ancient schwannomas
A. The tumor is composed of spindle cell proliferation with hyper-and hypocellular areas and focal cystic degeneration. Rare atypical large nuclei are present in the absence of significant mitotic activity B. Hyalinized and thickened blood vessels can be observed and fibrotic stroma. Immuno-staining was positive for S-100 (not shown).