Glioblastoma. a Pleomorphic tumor cells with indistinct cytoplasm and prominent, fibrillary processes in a left neck level 2 FNA (Field-stained direct smear ×10). b The features are recapitulated in the CNB obtained from the same site with tumor necrosis (asterisk) and skeletal muscle fibers (right margin) seen in the same field (HE-stained tissue section ×20). FNA, fine-needle aspiration; CNB, core-needle biopsy.