Gastrointestinal stromal tumor Gastrointestinal stromal tumor. This is an example of the spindle cell subtype. Perinuclear vacuoles (arrow) are frequently seen in this subtype of GIST. Source: Pathology of the Gastrointestinal Tract, Pathology: A Modern Case Study Citation: Reisner HM. Pathology: A Modern Case Study; 2015 Available at: http://accessmedicine.mhmedical.com/DownloadImage.aspx?image=/data/books/1569/rei_ch9_f019.png&sec=95969851&BookID=1569&ChapterSecID=95969741&imagename= Accessed: December 27, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved