Granular cell angiosarcoma of the skin: histology, electron microscopy and immunohistochemistry of a newly recognized tumor

We report a unique angiosarcoma of the skin of the face in which a large part of the tumour was of granular cell appearance. Histologically the granular cells resembled those of conventional granular cell tumours. By electron microscopy the granules were identical to those of granular cell tumours but other features were lacking. Stains for vimentin and factor VIII related antigen were positive, but for S-100 protein and CEA were negative. The occurrence of granular cell change in an angiosarcoma supports the view that granular cell tumours are histogenetically diverse.     

人脑内血管的一些超微结构观察

应用电镜观察了人类成体相对正常和二月胎儿的脑内血管,发现前者进入脑内的血管有微动脉、中间微动脉及毛细血管;后者脑内仅见毛细血管。脑内毛细血管衬以单层无孔连续性内皮,内皮细胞向管腔面和基膜面发出突起,在细胞间连接处有突向管腔的边缘褶。脑肿瘤患者及胎脑血管中内皮细胞向管腔的突起长而分枝,呈皱襞状。并对毛细血管内皮细胞的细微结构进行了观察描述。     

Ultrastructure of parathyroid autografts in chronic renal failure including the occurrence of concentric membranous bodies and intermediate filaments

The ultrastructure of long-term parathyroid autografts and their donor glands has been studied in nine patients with chronic renal failure. Autografts showed ultrastructural features of functional activity. Unusual findings included the presence of 'spironolactone-like' concentric membranous bodies derived from the endoplasmic reticulum in one hyperplastic autograft and prominent intracellular intermediate filaments (tonofilaments) in the donor parathyroid gland and recurrent autograft growths in another patient.     

White piedra: ultrastructure and a new microecological aspect

White piedra or trichosporosis is a superficial mycosis of the hair shaft, caused by the yeast Trichosporon beigelii; it has been found in all continents and may involve the hair of any part of the body. We report a case of white piedra on the hairs of the inguinal fold with ultrastructural studies. Transmission electron microscopy showed that the nodules have the same morphological aspects as the fungus in culture (hyphae and arthrospores) except for the presence of a cementant substance. By scanning electron microscopy the elimination of spores was seen on the nodule surface. Interestingly similar nodules were found on cotton fibres of the patient's underwear, which were also studied by scanning electron microscopy. This finding can explain therapeutic failure and demands special hygienic conditions related to clothes.     

小儿急性白血病的免疫表型研究及电镜观察

应用系列单克隆抗体对29例小儿急性白血病进行免疫表型研究,并对其中的12例作电镜超微结构、电镜细胞化学观察。结果显示,用不同研究手段对白血病进行髓系、淋系的分类诊断基本(?)符,根据白血病细胞免疫表型可以明确细胞的不同来源及分化程度,研究中还发现,有较多的混合表型病例(24%)。提示白血病细胞常表现为异质性抗原表达紊乱。电镜观察可以弥补光镜的不足,与光镜结合可提高诊断水平。     

Ultrastructural similarities of adenoid cystic carcinoma and pleomorphic adenoma

Ultrastructural examination of five adenoid cystic carcinomas, three breast and two salivary gland, reveals identical patterns of tumour cell differentiation, organization and distribution of cellular products (Zaloudek, Oertel & Orenstein 1984). In both sites, there is proliferation of two populations of cells, one with characteristics and organization of duct-type luminal epithelial cells and a second that forms the principal proliferating component and has the overall organization and appearance that would suggest that they represent modified myoepithelial cells. Recent ultrastructural studies also indicate that tumour cell types and histological organization similar to those described for adenoid cystic carcinoma occur during histodifferentiation of salivary gland pleomorphic adenoma (Dardick et al. 1983a, b). The characteristic histological pattern of adenoid cystic carcinoma is dependent on the formation of pseudolumina containing proteoglycans and reduplicated basal lamina. Similar, but smaller, lumina of like organization and contents are evident in some cases of pleomorphic adenoma. Both the ultrastructural similarities of the tumour cell types and their organization, in adenoid cystic carcinoma and pleomorphic adenoma, suggest that these tumours have a similar histogenetic basis. The fact that one lesion is malignant and the other benign does not preclude common types of tumour cells and developmental processes.     

Effects of Hemorrhagic Fever Renal Syndrome Virus on Human Bone Marrow Cells Virus on Human Bone marrow Cells

The effects of hemorrhagic fever renal syndrome(HFRS)viruson bone marrow cells are discussed in this paper.Viral antigenicfluorescence in immature marrow cells,especially in megakaryocy-tes,was found in 34 of 45 patients with HFRS by means of IFAand FA.The suspension of marrow cells of 10 patients with HFRSwas inoculated into a flask with Vero-E_6 cells.The strains of HFRSvirus were isolated.Constructural abnormality of bone marrow cellsand virus-like particles were observed in dilated channel of roughendoplasmic reticulum and Golgi apparatus by electron microscopy.These results suggest that human bone marrow cells are one of targetcells which are attacked by HFRS virus and that the virus multip-lication in bone marrow cells can cause a damage of immature cellsand a severe thromocytopenia.