32 year-old female with headache rule out masses. There is no evidence of intracranial hemorrhage, mass or edema. There is suspected crowding at the foramen magnum as there is lack of visualization of the subarachnoid space. This may be due to patient positioning for the exam or Chiari malformation. MRI is recommended for further evaluation of the intracranial structures at this level. There is no visualization of the sulci, however, the gray-white junction remains distinct. Ventricular volumes are small but this may be normal for the patient's age. The calvaria and skull base are radiographically normal. The visualized paranasal sinuses and mastoid air cells are normally pneumatized.
1. Suspected crowding at the foramen magnum may be due to patient positioning or Chiari malformation. Further evaluation with MRI is recommended to further define intracranial structures at this level. 2. Etiology of patient's headache may be due to pseudotumor cerebri, clinical correlation advised.