Spontaneous intracranial hypotension presenting without orthostatic headache complicated by acute subdural hematoma after drainage for chronic subdural hematoma--case report.

A 28-year-old man presented with a case of spontaneous intracranial hypotension (SIH) manifesting as a bilateral chronic subdural hematoma (CSDH) without orthostatic headache. He developed life-threatening acute SDH as a complication of CSDH drainage. Neurosurgeons should be aware that SIH patients do not always present with orthostatic headache. Brain magnetic resonance imaging with gadolinium may be recommended for young adults with non-traumatic CSDH before drainage to exclude SIH, even if they do not present with orthostatic headache.