Journal List > Korean J Hepatobiliary Pancreat Surg > v.16(2) > 1040573

Kwon, Kim, Lee, Jang, Park, Han, and Kang: Myoepithelial hamartoma as a solitary mass in the pancreatic parenchyma: the first case report

Abstract

Solid hamartoma of the pancreas is very rare, and only 3 cases have been reported thus far. A patient underwent pancreaticoduodenectomy due to a mass in the head of the pancreas which was suspected to be a borderline malignant tumor, but the histologic diagnosis turned out to be myoepithelial hamartoma (MEH) or adenomyoma. It was characterized by benign duct and glandular structures surrounded by proliferating smooth muscle, and acinus formation was not observed. Immunohistochemical stain for smooth muscle actin (SMA) was positive in spindle cells, and CD34 was negative, differentiating it from the three previously reported cases of solid hamartoma of the pancreas. MEH is an entity that is on the same spectrum as heterotopic pancreas. MEH is rare and has usually been reported in the gastrointestinal tract. To the best of our knowledge, MEH has never been reported in the pancreas. Therefore we report the world's first documented case of MEH of the pancreas.

References

1. Lasser A, Koufman WB. Adenomyoma of the stomach. Am J Dig Dis. 1977. 22:965–969.
2. Ryan A, Lafnitzegger JR, Lin DH, et al. Myoepithelial hamartoma of the duodenal wall. Virchows Arch. 1998. 432:191–194.
3. Nagata S, Yamaguchi K, Inoue T, et al. Solid pancreatic hamartoma. Pathol Int. 2007. 57:276–280.
4. Pauser U, da Silva MT, Placke J, et al. Cellular hamartoma resembling gastrointestinal stromal tumor: a solid tumor of the pancreas expressing c-kit (CD117). Mod Pathol. 2005. 18:1211–1216.
5. Sternberg SS, Mills SE, Carter D. Sternberg's diagnostic surgical pathology. 2004. 4th ed. Lippincott Williams & Wilkins.
6. Lewin KJ, Appelman HD. Tumors of the esophagus and stomach. 1996. Armed Forces Institute of Pathology.
7. Hai S, Yamamoto S, Tanaka H, et al. Adenomyoma of the common hepatic duct mimicking bile duct cancer: report of a case. Surg Today. 2007. 37:608–611.
8. Tomibayashi A, Sasaki S, Nakayama H, et al. Adenomyoma of the small intestine in an adult: report of a case. Surg Today. 2011. 41:1101–1105.
9. Pouget RR, Bacon HE. Myoepithelial hamartoma of the rectum. Dis Colon Rectum. 1961. 4:409–412.
10. Yu HC, Lo GH, Lai KH, et al. Adenomyoma of the jejunum ---a rare cause of gastrointestinal bleeding. J Chin Med Assoc. 2008. 71:96–99.
11. Takeyama J, Sato T, Tanaka H, et al. Adenomyoma of the stomach mimicking infantile hypertrophic pyloric stenosis. J Pediatr Surg. 2007. 42:E11–E12.
12. Lee JS, Kim HS, Jung JJ, et al. Adenomyoma of the small intestine in an adult: a rare cause of intussusception. J Gastroenterol. 2002. 37:556–559.
13. Tanaka N, Seya T, Onda M, et al. Myoepithelial hamartoma of the small bowel: report of a case. Surg Today. 1996. 26:1010–1013.
14. Ikegami R, Watanabe Y, Tainaka T. Myoepithelial hamartoma causing small-bowel intussusception: a case report and literature review. Pediatr Surg Int. 2006. 22:387–389.
15. Ly DP, Barnard NJ, Schwarz RE. Gastric adenomyoma: definitely benign or defiantly premalignant. Dig Dis Sci. 2004. 49:1930–1934.
TOOLS
Similar articles