Abstract
According to a well-established and widely accepted classification of intestinal tumors, protruding lesions of the duodenum are divided histopathologically into two categories: neoplastic and non-neoplastic.1 The latter category includes inflammatory, hamartomatous, and hyperplastic polyps. In the duodenum, however, there are polypoid lesions that cannot be specifically classified as any of these non-neoplastic types. These indeterminate lesions have been referred to as “unclassified polyps.” Three patients with duodenal polyps that were of the unclassified type were encountered. The polyps had markedly similar and uniform morphologic and histopathologic features.
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