[Myospherulosis: a riddle asked by strange bags of marbles. A report of four cases (author's transl)].

Four cases of "myospherulosis" are presented with a review of the thirty cases previously reported in the litterature. The disease is characterized by clusters of spherules, surrounded by a thin membranous bag, within a multicystic reaction of muscular and subcutaneous tissue or of paranasal sinuses. The actual nature of these spherules still remains unknown.

[Histological aspects of mycoses provoked by opportunistic fungi].

The histological study with Hotchkiss-Mc Manus staining and Grocott silver impregnation of tissues invaded by opportunistic fungi is a rapid and easy means of diagnosis. The inflammatory reactions around the fungus give the certitude that it is a pathogen and not a contaminant. The major opportunists among Canidida, Aspergillus, Mucor, Absidia and Cryptococcus species are presented in local and disseminated lesions, but all fungi, saprophytic in the normal host, can become pathogens in the immunodepressed patient.

[Cerebral mucormycosis in the cat caused by Mucor pusillus].

The pathologic examination of the brain of a pet cat, suspected of rabies, showed lesions of mucormycosis. The causal fungus, Mucor (Rhizomucor) pusillus was isolated and identified. The authors describe the lesions produced, the experimental pathogenicity for the rabbit and the morphologic and physiologic characteristics of the isolate.