[Myositis ossificans progressiva (M.o.p.)--a morphological and biochemical study (author's transl)].

In a two-year-old girl suffering from myositis ossificans progressiva a biopsy specimen from a soft tissue tumor was examined by electron microscopy and by collagen electrophoresis (SDS-Polyacrylamide Gel Electrophoresis). Electron microscopic findings of the biopsy specimen showed that the collagen appeared to be similar to type II collagen which can be found for example in hyaline cartilage however collagen electrophoresis revealed neither any certain signs of type II collagen nor any different proportion of type I and type III collagen compared to a healthy child.