RT Journal Article SR Electronic T1 Delayed diagnosis of bilateral subdural effusions complicating intracranial hypotension in a patient presenting with post lumbar puncture headache JF BMJ Case Reports JO BMJ Case Reports FD BMJ Publishing Group Ltd SP e239559 DO 10.1136/bcr-2020-239559 VO 14 IS 2 A1 Huq, Saleheen A1 Iyer, Menaka G A1 Oyibo, Samson O YR 2021 UL http://casereports.bmj.com/content/14/2/e239559.abstract AB A 34-year-old woman presented with an unrelenting headache which had been ongoing since discharge from hospital 4 days before. She initially presented 2 weeks earlier with a 7 days history of severe headache, for which she had a CT scan, lumbar puncture and treatment for possible viral meningitis. The headache got worse 4 days after the lumbar puncture. Despite analgesics and bed rest, the headache persisted. A subsequent magnetic imaging scan demonstrated bilateral subdural effusions. She was given supportive treatment, which included advice concerning strict bed rest and analgesia. The headache took several months to abate. A third of patients suffer from post lumbar puncture headaches and this should be explained during informed consenting and post procedure. Not all post lumbar puncture headaches are simple headaches. A post lumbar puncture headache continuing for more than 7–14 days after the procedure requires further investigation to exclude life-threatening intracranial complications.