Figure 15.

Gastrointestinal stromal tumour (GIST). (a) Photograph of resected and opened exophytic mass originating from a jejunal loop (not shown) in a 79-year-old woman who presented with abdominal discomfort shows a well-defined inner core (asterisk) surrounded by a larger solid tissue with necrotic and haemorrhagic changes. (b) Low-power photomicrograph (magnification ×4; haematoxylin–eosin stain) of the inner core (asterisk) shows involvement of all submucosal layers without infiltration of the mucosal epithelium. (c) CD-117 antibodies stain confirms GIST diagnosis (asterisk).