Solitary fibrous tumor/hemangiopericytoma. a Cohesive tissue fragment comprised of relatively monomorphous, closely apposed cells with small nucleoli (inset) arranged in a haphazard pattern around a thin-walled vessel (asterisk) in a left scapular FNA (HE-stained cellblock section ×40; inset: Papanicolaou-stained cytospin preparation ×63 oil). b The prior resection demonstrates essentially the same features including multiple mitotic figures (arrows) (HE-stained tissue section ×20). FNA, fine-needle aspiration.