Résumé
Biomphalaria glabrata, highly susceptible to Schistosoma mansoni, were seen to shed less and less cercariae along the time of infection. Histological examination kept a close correlation with this changing pattern of cercarial shedding, turning an initial picture of no-reaction (tolerance) gradually into one of hemocyte proliferation with formation of focal encapsulating lesions around disintegrating sporocysts and cercariae, a change that became disseminated toward the 142nd day post miracidial exposure. Findings were suggestive of a gradual installation of acquired immunity in snails infected with S. mansoni
Sujets)
Animaux , Biomphalaria/ultrastructure , Schistosomiase à Schistosoma mansoni/physiopathologie , Biomphalaria/parasitologie , Système digestif/parasitologie , Système digestif/anatomopathologie , Glandes exocrines/parasitologie , Glandes exocrines/anatomopathologie , Rein/parasitologie , Rein/anatomopathologie , Schistosoma mansoni/isolement et purification , Facteurs tempsRésumé
Os autores apresentam 4 casos de tumor pleomórfico ou tumor misto de glândula lacrimal. É o tumnor benigno mais frequente da glândula lacrimal e contém elementos da linhagagem epitelial e conjuntiva. A apresentaçäo clínica é analisada. O estudo pré-operatório inclui Rx de crânio e tomografia computadorizada. O tratamento é cirúrgico e o resultado final é satisfatório com ressecçäo total em todos os casos.