| Popis: |
Various globular materials appeared in the stroma of a low malignancy type of mucoepidermoid carcinoma (24-year-old woman: MDC 073-76) were studied by electron microscopy and by x-ray microanalytic method. Results were as follows: 1. These globular materials may be classified into five types. 2. Type I was electron-lucid vesicle with unit membrane, and was considered to have matrix vesicle-like functions. 3. Type II was electron-lucid globular materials with a electron-dense periphery, which had no evidence of calcification. 4. Type III was closed or round layer structure being composed of minute granular crystals. 5. Type IV was globular material, composed of both minute granular and needle-like crystals. 6. Type V was globular material only with developing needle-like crystals. 7. Type III and IV were mainly composed of P and Ca, therefore these structures were thought to be calcified. 8. It was considered that type V was similar to the matrix vesicle in initiation site of bone calcification, according to its ultrastructure and the results of analysis. |
