[Progressive BK virus associated multifocal leukoencephalopathy in an immunocompromised patient treated with corticosteroids].

Introduction: BK virus has been described previously in renal transplant patients, but has also been reported in cases of progressive multifocal leukoencephalopathy.

Method: A case of progressive BK virus multifocal leukoencephalopathy induced by long-term corticosteroid therapy is reported.

Results: In our case, BK virus was detected in cerebrospinal fluid by polymerase chain reaction (PCR).

[Chronic ergotism: spinal lesion and neuropathy].

Introduction: Neuropathologic manifestations due to chronic ergotism are rare.

Observation: We report the case of a 40-year-old patient who presented clinical signs and symptoms of a spinal lesion and also the symptoms of neuropathy involving the right sciatic nerve, more precisely the internal and external popliteal nerves, following ingestion of methysergide. Complete recovery was achieved with calcium blocker treatment.