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BACKGROUND Chronic cerebrospinal venous insufficiency (CCSVI) has recently been reported to be associated with multiple sclerosis (MS). However, its actual prevalence, possible association with specific MS phenotypes, and potential pathophysiological role are debated. METHOD We analysed the clinical data of 710 MS patients attending six centres (five(More)
nocytochemistry of ovine sporozoan encephalitis and enceph-alomyelitis. A small isolated population of around 500 beluga whales (Delphinapterus leuces) live in permanence in the St. Law-rence estuary. 17 They have been found to be highly contaminated , mostly with organochlorines and heavy metals, and to show many pathological lesions. Sarcocystis is a(More)
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