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© 2025. This work is published under https://www.jpatholtm.org/articles/archive.php (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

Mucoceles, commonly observed in the appendix, are mucin-filled, dilated structures arising from a range of etiologies. Cases associated with dysplastic or neoplastic epithelium can rupture and disseminate within the abdominopelvic cavity. Similar lesions in other parts of the colon are exceedingly rare, with only 16 colonic mucoceles having been reported. The first case of a colonic mucinous neoplasm with dysplasia resembling a low-grade appendiceal mucinous neoplasm involving rectal stump was described in 2016. Here, we present the second such case arising in the rectal stump, identified in a 44-year-old male with extensive surgical history. Microscopic examination revealed low-grade dysplastic epithelium lining the cyst and mucin dissecting into the stroma, without evidence of rupture or extramural mucin. The patient was followed for 16 months without recurrence or peritoneal disease. The exact etiology and outcome of these rare lesions remain unknown, requiring close follow-up.

Details

Title
Mucocele of the rectal stump: mucinous cystic neoplasm with low-grade dysplasia simulating low-grade appendiceal mucinous neoplasm
Author
Aydin, Hasan Basri 1 ; Faraz, Maria 1 ; Chismark, A David 2 ; Qiu, Haiyan 1 ; Lee, Hwajeong 1 

 Department of Pathology and Laboratory Medicine, Albany Medical Center, Albany, NY, USA 
 Department of Surgery, Albany Medical Center, Albany, NY, USA 
Pages
139-146
Section
CASE STUDY
Publication year
2025
Publication date
Mar 2025
Publisher
Korean Society of Pathologists, Korean Society for Cytopathology
ISSN
23837837
e-ISSN
23837845
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
3187245880
Copyright
© 2025. This work is published under https://www.jpatholtm.org/articles/archive.php (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.