Discussion of Subfalcine herniation
- Herniation of brain underneath the falx.
- Complications of subfalcine herniations include ipsilateral anterior cerebral infarction. This occurs as the cingulate sulcus extends under the falx dragging the ipsilateral anterior cerebral artery with it. If this becomes compressed against the falx and occludes, this can lead to a distal anterior cerebral artery infarction and thus the clinical symptom of contralateral leg weakness.
 Imaging Findings of Subfalcine herniation
- Easiest method of evaluating for subfalcine shift is a straight line drawn in the expected location of the septum pellucidum from the posterior most aspects to the falx on axial images.
- Shift of the septum pellucidum from this midline can be measured in millimeters and compared over time to determine any change.
- Asymmetry at the anterior falx with a widened CSF space on the contralateral anterior falx.
- There may be ipsilateral lateral ventricle compression with contralateral lateral ventricle and atria dilation.
 See Also
 External Links
- Laine, FJ, Shedden, AI, Dunn, MM, Ghatak, NR. Acquired intracranial herniations: MR imaging findings. Am. J. Roentgenol. 1995 165: 967-973.
- Medpix brain herniation page