Dome-Type: A Distinctive Variant of Colonic Adenocarcinoma

• Main Authors: Giacomo Puppa, Mariella Molaro
• Format: Article
• Language: English
• Published: Hindawi Limited 2012-01-01
• Series: Case Reports in Pathology
• Online Access: http://dx.doi.org/10.1155/2012/284064

Introduction. Ten cases of dome-type adenocarcinoma of the colon have been reported so far. Most of them were presented as early lesions, with endoscopic and microscopic distinguishing features. Methods and Results. A raised plaque was removed from the right colon during colonoscopy in a 56-year-old man. Histopathological examination showed a cancerized adenoma invading the submucosa with several typical features of dome-type adenocarcinoma, in particular the associated prominent lymphoid tissue. Immunohistochemistry showed retention of the mismatch repair proteins MLH-1, MSH-2, MLH-6, and PMS-2. Conclusion. We report an additional case of dome-type adenocarcinoma of the colon as an early, low-risk, and microsatellite stable tumor, indicating that this particular histotype may deserve specific consideration for both classification and management.