Summary
A case of annular pancreas found in a 45 year man was successfully treated by surgical resection. An histological and immunohistochemical study of the endocrine component within the resected annular tissue showed its identity with that of the postero-inferior head in the normal adult pancreas, both tissues being characterized by very high PP cell content, extremely few A cells and irregularly shaped islets.
This observation supports a common origin of the two tissues from the ventral pancreatic primordium.
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Sessa, F., Fiocca, R., Tenti, P. et al. Pancreatic polypeptide rich tissue in the annular pancreas. Vichows Archiv A Pathol Anat 399, 227–232 (1983). https://doi.org/10.1007/BF00619582
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DOI: https://doi.org/10.1007/BF00619582