Pseudotumoral form of neuroschistosomiasis: report of three cases in Ganzi, China.

The authors report three rare cases of neuroschistosomiasis lacking extracranial involvement. No parasitic eggs were detected in the stool with the Kato-Katz thick smear methods. Computed tomography of the brains showed hypodense signals, and magnetic resonance imaging showed isointense signals on T1-weighted images, hyperintense signals on T2-weighted images, and intensely enhancing nodules in the brain after intravenous administration of gadolinium. High-grade gliomas were suspected, and operations or radiosurgery was performed. Cerebral schistosomiasis was confirmed in all cases by biopsy of the brain lesions, revealing granulomas containing embedded Schistosoma japonicum eggs. All cases were definitively diagnosed as brain schistosomiasis japonica. Praziquantel and corticosteroids were administered, and the prognoses were good for all case patients. Although the aforementioned pattern of imaging examinations is not present in all cases of neuroschistosomiasis, a diagnosis of neuroschistosomiasis should be considered when this pattern of imaging is observed; cerebrospinal fluid serological exams are also recommended.