Histochemical Nature of Eosinophilic Globules in Pheochromocytoma of Adrenal Medulla

Eosinophilic globules were observed in 7 out of 11 cases of pheochromocytoma of the adrenal medulla. All of these globules were present in the cytoplasm, and were round and eosinophilic, measuring 3 μm to 30 μm in diameter. These globules were periodic acid Schiff (PAS) -positive with and without diastase predigestion, phosphotungstic acid hematoxylin (PTAH) positive, acid fuchsin positive, and autofluorescent under ultraviolet illumination. These findings were very similar to the eosinophilic globules of yolk sac tumor, hepatocellular carcinoma, Kaposi\u27s sarcoma, and alpha-l-antitrypsin deficiency in light microscopy and histochemistry. They were not stained with Grimelius\u27s method for argyrophil reaction, and Fontana-Masson\u27s method for argentaffin reaction. It might be suggested that eosinophilic globules in pheochromocytoma of the adrenal medulla were not related to the chromaffin secretory granules and these globules were glycoprotein

Case of plasmablastic lymphoma of the sigmoid colon and literature review

Plasmablastic lymphoma (PBL) is a rare form of non-Hodgkin\u27s lymphoma that is associated with human immunodeficiency virus (HIV) infection. Although PBL is most commonly observed in the oral cavity of HIV-positive patients, it can also be observed at extra-oral sites in HIV-negative patients. This report represents an unusual case of HIV-negative PBL that occurred in the sigmoid colon. This patient had a history of systemic lupus erythematosus and an underlying immunosuppressive state from long term steroid therapy. The lymphoma cells were positive for CD138, kappa light chain restriction and Epstein-Barr virus and negative for CD20/L26, CD3, CD79a, UCHL1 (CD45RO) and cytokeratin (AE1/AE3). The patient died approximately 2 mo after the operation. In the present paper, we review cases of PBL of the colon in HIVnegative patients