Syndrome of transient Headache and Neurological Deficits with cerebrospinal fluid Lymphocytosis (HaNDL).

A lady in her late 20s was admitted with a history of headaches and intermittent focal neurological symptoms which were greatly exacerbated by catheter angiography of the cerebral circulation. Cerebrospinal fluid analysis demonstrated a lymphocytic pleocytosis. She subsequently made a spontaneous recovery, without neurological sequelae. Her presentation fits the diagnostic criteria for the previously described syndrome of transient headache and neurological deficits with cerebrospinal fluid lymphocytosis (HaNDL). HaNDL is a probably underdiagnosed nosological entity, characterised by often dramatic clinical manifestations but ultimately a good prognosis.