Fig. 1
adapted from Gardner et al. 2016, J Neurotrauma, 33(1):157–61 (permissions pending review and acceptance of manuscript)
Enlarged views of representative T1 coronal images for each “grade” of cavum septum pellucidum (CSP). A “Grade 0” septum pellucidum appears crisp without any evidence of cyst or separation (CSP absent). “Grade 1” CSP shows slight interior hypointensity that is not clearly CSF signal intensity (septum unclear/CSP equivocal). Grades 2–4 show clear evidence of CSF signal between separated leaves of the septum pellucidum. The degree of separation between the leaves is used to assign a grade of 2–4: Grade 2 CSP is not wider than the septum, Grade 3 CSP is wider than the septum but less than half the intraventricular width, and Grade 4 CSP is greater than half the intraventricular width. Grading is based on the coronal slice that shows the greatest evidence of separation of the leaves of the septum pellucidum. Figure and caption