Feedback: Computed tomography and lumbar puncture for the diagnosis of subarachnoid hemorrhage: The importance of accurate interpretation

Figure (Schwartz). A 37-year-old woman with a 1-hour history of headache. The CT scan reveals communicating hydrocephalus with dilation of the third, fourth, and temporal horns of the lateral ventricles. Although this finding is indicative of SAH, in this study, the CT scan was considered a false-negative. From Morgenstern LB, Luna-Gonzales H, Huber JC, et al. Worst headache and subarachnoid hemorrhage: prospective, modern computed tomography and spinal fluid analysis. Ann Emerg Med. 1998;32:297-304.