Adenomyoma of the small intestine

Figure 1 Gross appearance of adenomyoma of the periampullary region. The lesions are observed as intramural nodules covered by mucosa and they protrude into the lumen (A, B, arrows).

Figure 2 Low-power view of adenomyoma of the small intestine. A nodular lesion mainly occupies the submucosa (hematoxylin and eosin stain, × 10).

Figure 3 High-power view of adenomyoma of the small intestine. The lesion consists of glandular structures of various sizes and interlacing smooth muscle bundles (hematoxylin and eosin stain, × 40).

Figure 4 Appearance of goblet cells (A, arrows) and Paneth cells (B, arrows) in the intestinal adenomyoma (hematoxylin and eosin stain, × 400).

Figure 5 Results of immunohistochemical staining for cytokeratin 7 and cytokeratin 20. The glandular element of the lesion is positive for cytokeratin 7 (A) and negative for cytokeratin 20 (B) (× 200).

Figure 6 Results of immunohistochemical staining for desmin. Smooth muscle cells surrounding the glandular elements are positive for desmin (× 100).