Neurocysticercosis is caused by central nervous system infestation by the larval stage of the pork tapeworm Taenia sofium (1, review). Cysticercosis has been rare in the Scandinavian countries. To our knowledge no cases from Norway and only three from Denmark and Sweden (2-4) have been reported. We present four patients treated for neurocysticercosis in our department the last two years.
Case reportsPatient 1 (Norwegian-born man, age 52) over three weeks developed general weakness, poor appetite, weight loss, speech problems, confusion and somnolence. On admission, he had impressive and expressive aphasia, dilated pupilla on the right side, right homonymous hemianopsia, dyspraxia and neglect of the right side, and brisk, but symmetrical reflexes. Cerebral computer tomography (CT) and magnetic resonance imaging (MRI) showed an area with central low attenuation and circular contrast enhancement deep in the left temporal lobe. It was surrounded by substantial edema displacing the falx and the third ventricle (Fig. IA). In spite of treatment with dexamethason and mannitol, his intracranial pressure increased. The left temporal lobe was, therefore, resected to avoid herniation. The resected tissue showed chronic inflammatory changes with eosinophilic granulocytes and granulomas, suggestive of parasite infection. Standard blood tests were normal. CSF showed a slight pleocytosis (16 white blood cells/mm3), oligoclonal bands on agar electrophoresis, and an ELISA test for cysticercus IgG was positive (RIVM, National Institute of Public Health and Environmental Protection, Bilthoven, The Netherlands). ELISA against cysticercus IgG in serum was also positive (1:160).The patient was treated with praziquantel(70 mg/ kg/day) for two weeks. He improved slowly. Aftertwo years there was no sign of a relapse, but he had dysphasia, dyspraxia and right hemianopsia sequelae.Patient 2 (Vietnamese-born man, age 41) had for three years experienced short episodes with dysphasia and paresis and paresthesia on the right side. He was referred after three days with several complex partial seizures with right arm convulsions. On admission expressive dysphasia and right hemiparesis were apparent. Cerebral CT and MRI showed several small calcifications and circular lesions with contrast enhancement in both hemispheres (Fig. lB,C). A lesion in the left sylvian fissure region showed a conspicuous surrounding edema. Standard blood and CSF tests were normal. Serological tests for various parasite infections including cysticercosis, toxoplasmosis and echinococcosis were negative in CSF and serum (RIVM).Antiepileptic medication (carbamazepin) was started. On clinical suspicion of cysticercosis the patient was treated with dexamethason and praziquantel 70 mg/kg/day. He improved rapidly, and after two weeks all neurological symptoms had disappeared. CT control showed calcifications as before, but no circular lesions with contrast enhancement. After 18 months there was no sign of a relapse.Patient 3 (woman born in India, age 19) was admitted after three...