Registre de correu electrònic: Expert’s comment concerning Grand Rounds case entitled ‘‘Intracranial hypotension with a sixth cranial nerve palsy subsequent to massive thoracic CSF hygroma: a rare complication of thoracic disc excision” (by A. Khurana, J. Brousil, A. Russo, A. Evans, N. A. Quraishi, B. M. Boszczyk doi:10.1007/s00586-013-2818-1)