My Friend Has Been Suffering From A Progressive Debilitating Neurological

My friend has been suffering from a progressive debilitating neurological disorder with lesions on the cerebellum and brain stem on MRI and has lost his ability to walk, feed himself, has very slurred speech, an loss of hearing in the right ear. He can move his extremities but the coordination is severely impaired. His wife says he has been diagnosed with CLIPS or CLIPPS for which treatment has been started with massive doses of corticosteroids. Can you tell me what this disorder is?