Fig. 5From: Gastric volvulus associated with shrinkage of a gastrointestinal stromal tumor by neoadjuvant imatinib: a case reporta, b Hematoxylin–eosin staining shows spindle-shaped mitotic tumor cells below 5/HPF and a grade 1b response to preoperative imatinib. c, d Immunohistochemical staining shows that the tumor is positive for KIT and CD34Back to article page