Schistosomiasis (Bilharzia) of the spinal cord: case reports and clinical profile.

Eight cases of schistosomiasis of the spinal cord are described. These fall into two groups. Four patients had clinical and myelographic evidence of lesions in the conus medullaris and were found to have bilharzial granulomas at operation. Four patients had normal or equivocal myelographic appearances, but the coincidence of unexplained lower cord or cauda equina lesions with evidence of bilharzia led to the presumed diagnosis of spinal cord bilharzia. These patients, together with data from 39 cases reported in the world literature since 1969, have been used to compile a clinical profile of this condition. The clinical picture is the product of two types of reaction to bilharzial infestation, granuloma and necrotic myelitis, affecting the lower cord and cauda equina in varying proportions. Granuloma is the better defined entity because it is diagnosed following operation and biopsy. Myelitis is seldom proved and its diagnosis depends on circumstantial evidence. Both S. mansoni and S. haematobium may be responsible for either type.