Presentation
Frequent urination with a palpable mass on the digital rectal examination.
Patient Data
A large well-circumscribed lobulated exophytic mass, arising from the left lateral rectal wall with effacement of the muscular layer and preserved mucosal layer, prolapsed in the rectovesical pouch, displacing the urinary bladder and the prostate anteriorly. It displays an isosignal to muscles on T1, intermediate to high signal on T2 with an area of high signal T1 and low signal T2 (probably hemorrhage) and restricted diffusion mainly of the peripheral non-necrotic component. The postcontrast sequences demonstrate a heterogeneous enhancement.
No evidence of local invasion of the adjacent structures.
No pelvic lymphadenopathy or ascites.
Case Discussion
MRI features of a large soft tissue mass arising from the lateral rectal wall, pathologically proven as Rectal gastrointestinal stromal tumor (GIST).
GISTs occur anywhere along the gastrointestinal tract. Colic and rectal location account for approximately 5-7% of cases.
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