Ectopic pancreas at the ampulla of Vater diagnosed with endoscopic snare papillectomy: A case report and review of literature

Table 1 Histological classification of ectopic pancreas

Heinrich classification (1909)

Type I - Contains acini, ducts and islands of Langerhans

Type II - Contains acini and ducts, but lacks endocrine elements

Type III Comprises proliferating ducts, exhibiting neither acini nor endocrine elements

Gasper Fuentes Classification (1973)

Type I - typical pancreatic tissue with acini, ducts, and islet cells similar to the normal pancreas.

Type II (canalicular variety) - pancreatic ducts only.

Type III (exocrine pancreas) - acinar tissue only.

Type IV (endocrine pancreas) - islet cells only.