RESUMEN
The histopathological findings include as following: Gliosis [52%], Neuronal necrosis [37%], Perivascular cuffing [5.4%], hyperemia and hemorrhage in cerebral tissues [32.9%], hyperemia and hemorrhage in meninge[19.2%], prevascullar and preneuronal edema [52%], Meningial edema [16.4%], Vacuole in neurons [2.7%], Vacuole in neuropil [8.2%], protozoal cyct [5.4%]. Frequency of fetal brain lesions consists of: meningitis [9.6%], encephalitis [50.7%], [nonsuppurative encephalitis 38.3%, suppurative encephalitis 12.3%], meningoencephalitis [8.2%], Encephalomalacia [1.4%], congenital anomalies [6.8%][hydrocephaly and hy dranencephaly]. Non purulent encephalitis was the most common lesion in fetal brains that could be caused by viral and protozoal agents. 71% of non-supporative encephalitis consisted of multifocal necrotic encephalitis which are mostly caused by protozoa. The etiology of abortion should be considered in future studies