The imaging features are classic of the extramucosal intramural mass lesion.

The characteristics of extramucosal intramural mass lesion are when viewed in profile, the lesions have a smooth surface that is etched in white on double contrast radiographs, and there borders form either right angles or slightly obtuse angles with the adjacent gastric wall. The overlying mucosa is usually intact.

The differentials for the extramucosal intramural mass lesions of the stomach are,

Leiomyoma: most common sudmucosal benign lesion; ulceration common; rarely multiple.

Lipoma: Submocosal mass with changeable shape at fluoroscopy, fatty density on CT scan.

Hemangioma: Submucosal mass with phleboliths.

Lymphangioma

Glomus tumour
Neurofibroma: Solitary or multiple submucosal masses.
Ectopic pancreatic rest: Submucosal mass with central umbilication; usually on greater curvature of  the distal antrum; rarely multiple.