Fig. 3

Histological findings. a Plexiform vascular networks and a prominently myxoid or mucoid matrix were observed in the tumor. The lesion was composed of the admixture of spindle and satellite cells with an atypical shape and hyperchromatic nuclei. The tumor did not contain mature adipose cells. Some lipoblast-like cells with small cytoplasmic vacuoles were observed (arrows, H&E × 200). b Immunohistochemical staining showed positivity for PLAG1 in many of the tumor cells (×400)