Rectal Mucinous Adenocarcinoma Invading Retrorectal Dermoid Cysts: A Case Report

Abstract

Rectal mucinous adenocarcinoma is a subtype of colorectal adenocarcinoma, which is more aggressive and prone to invade adjacent normal organs or tissues compared with non-mucinous adenocarcinoma. Retrorectal dermoid cyst is a rare congenital disease, which usually are benign but with a potential for malignant degeneration. In this article, we report a case which presented a rectal mucinous adenocarcinoma invading into retrorectal dermoid cysts, indicating that besides adjacent normal organs or tissues, malignancies can also invade adjacent tumors, making their diagnosis and management more complicated. In such cases, double primary tumors should be considered, and they should be removed surgically.

Diagnostic, Therapeutic and Evolutionary Problems of Retro-Rectal Tumors (About 3 Cases)

“…However, due to their location, they can manifest themselves by very different clinical signs. More rarely, these tumors can be revealed by: • A pelvic tumor syndrome which may include pelvic pain [5], compressive disorders [3], urinary signs in 10% of cases [6] and neurological signs in 10% of cases [7,8] such as uni or bilateral lumbosciatalgia; • Superinfection occurs in 20-30% of cases [3], [9]; • Malignant transformation [3] and • Other clinical signs may be associated [3] including anal or gluteal pruritus that is resistant to antihistamine, corticosteroids and antiparasitic drugs. The diagnosis is made clinically by digital rectal examination [5], [7], [10].…”

Retrorectal Mucinous Adenocarcinoma Arising from a Tailgut Cyst: A Case Report

“…Other diagnoses are infrequently reported following such appearances on imaging. One case of rectal mucinous adenocarcinoma invading retrorectal dermoid cysts was recently reported [7]. Another very similar case of retrorectal mass, multilocular cystic on MRI with disseminated calcifications, involved retrorectal metastasis of pancreatic mucinous adenocarcinoma [8].…”