Solid and XXXX . A report of two cases with immunohistochemical and ultrastructural studies.

@entity1 @entity788 @entity5
Two @entity788 were found in young @entity1 without detectable functional symptoms. These @entity5 were identical in gross, histological and electron microscopic features. Each of them formed a large abdominal mass. One of them was found because of this abdominal mass, while the other was found incidentally. Grossly, the @entity5 were well circumscribed by a firm, white, fibrous capsule, and their cut-surfaces showed mainly cystic degenerative changes with necrotic and hemorrhagic material, with only some solid portions. The solid portions were composed of uniform cells forming solid and papillary structures with numerous PAS-positive diastase-resistant granules. Immunohistochemical staining for alpha 1-antitrypsin showed a granular distribution. Electron microscopic examination showed that the @entity5 cells had numerous mitochondria, zymogen-like granules, and annulate lamellae. These findings strongly suggested acinar cell differentiation, although ductal and endocrine differentiation have also been observed by others. Therefore, this type of @entity5 can best be termed an @entity5 . There was no recurrence in either @entity1 after the operation. Long survival can be expected, but reports indicate that this @entity5 should be recognized as a lesion of @entity5 .
