Rectal adenocarcinoma and ejaculatory duct cyst on MRI
Rectal bleeding. Sigmoidoscopy and biopsy confirm rectal adenocarcinoma. Staging MRI.
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There is a semi-annular anterior mid-rectal lesion of intermediate signal intensity. It is 3 cm long and the distal edge is 6 cm from the anal margin. There is no penetration through the muscularis propria. There are 2 lymph nodes in the mesorectum with abnormal signal. There are no abnormal inguinal or pelvic sidewall nodes, and no signs of extramural venous invasion. The rectal cancer is staged as T2 N1 Mx V0, CRM clear.
There is an incidental round structure arising from base of the prostate, situated between the seminal vesicles. It is high signal on T2 weighted images and is an ejaculatory duct cyst.