Fig. 1

MRI, colonoscopic and operative findings of the lateral pararectal mass in the same patient. A Sagittal image showing a large mucocele without sphincteric involvement (A). Image B confirms the mucocele locale and dimensions on axial MRI. B On flexible endoscopy the mucocele appears as a pararectal submucosal mass without any luminal connexion. C Clear mucoid material was evacuated from the mass. D The operative specimen included part of the rectal mucocele with visible rectal mucosa and retained staples. F Operative view in which the mucocele was formally opened and marsupialized with the rectal lumen