Fig. 1

Preoperative findings. a The primary site of angiosarcoma of the scalp shows infiltrative spread. An arrow shows the nodule. The tumor is demarcated by the red-brown color (arrowheads). b Tumor cells from the primary site of the scalp (biopsy specimen). c Preoperative findings on contrast-enhanced computed tomography. Focal wall thickening of the small intestine is surrounded by ascites (arrows), and free air is present (arrowheads)