Microadenomatosis of the endocrine pancreas in patients with and without the multiple endocrine neoplasia type 1 syndrome

The American Journal of Surgical Pathology
Martin AnlaufG Klöppel


It has been suggested that microadenomatosis of the endocrine pancreas is a hallmark of the multiple endocrine neoplasia type 1 syndrome (MEN1). This study attempts to elucidate the relationship between pancreatic microadenomatosis and the MEN1 and von Hippel-Lindau (VHL) syndromes. Pancreatic tissue specimens from 37 patients (with either microadenomatosis or the MEN1 syndrome) were analyzed using immunohistochemistry, confocal laser scanning microscopy, and morphometric methods. The MEN1 and the VHL status were assessed on the basis of clinical criteria (all patients) and PCR-based mutational analysis (15 and 5 patients, respectively). Pancreatic microadenomatosis was found in 35 of 37 patients, 28 of whom fulfilled the clinicopathologic criteria and 13 the genetic criteria for MEN1, whereas none of the patients had evidence of a VHL syndrome. Microadenomas were present in 26 of the 28 MEN1 patients, and all these tumors were consistently multihormonal. Five of the 9 patients with microadenomatosis and no clinical evidence for MEN1 or VHL also lacked mutations for the respective genes. Five of these 9 patients suffered from hyperinsulinism and revealed multiple insulin-positive tumors. The other patients were nonsymptomatic a...Continue Reading


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