Biological studies on fresh water snails target to Schistosoma mansoni infection

In this study ,upon exposure of laboratory Egyptian B. alexandrina and B. glabrata snails to its homologus strain of S. mansoni, two different phenotype strains " susceptible and resistant " were distinguished . The aim of this study is to investigate the biological differences between the two types of Biomphalaria snails either susceptible or resistant at different ages. The investigated parameters included mortality, survival, percentage of susceptibility / resistance to parasitic infection and fecundity. The results of the preliminary exposure experiment revealed that parental snail stock was not completely susceptible and tend to be partially refractory to infection. The results also showed a strong association between the levels of egg production and susceptibility to parasite infection. Where breeding experiment revealed that, total egg number, E/M and EM values produced by resistant phenotype of both snail species were more than those produced by susceptible progeny snails. Also, it was noticed that, egg production is associated inversely proportion with snail age

CT manifestations of brain lymphoma

During the period from January 1993 to January 1994, the CT findings of 16 patients with histologically proven diffuse histiocytic lymphoma of the brain were reviewed at radiodiagnosis department, Ain-Shams University Hospitals. Their age ranged from 7 to 63 years, 11 cases were males and 5 were females. Primary disease was proved in 4 cases, while secondary disease was found in 12 cases. Both primary and secondary diseases exhibited the characteristic CT appearance consisting of a large, solid homogenously enhanced mass with varying amounts of edema and very minimal or even no mass effect. Peripheral secondary lymphomas outside the brain stem and basal ganglia usually contained areas of low attenuation consistent with necrosis. Multifocal lesions were found to occur more likely in secondary than in primary lymphomas