Sequential histological changes in Biomphalaria glabrata during the course of Schistosoma mansoni infection

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

Tumor misto da glândula lacrimal / Lacrimal gland mixed tumor

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.