Fig. 4

Pathological examinations. a Gross appearance of the resected specimen. The tumor measured 43 × 35 mm in size, and a 10-mm distal resection margin was secured. b Cross-sectional view of the tumor. Magnified view of the square area is shown in (c). c Histological examination (hematoxylin and eosin staining). All of the tumor cells caused hyaline degeneration