FIG 2. Images from the case of a 40-year-old woman with headaches who had normal results of an MR imaging study.

A, Axial source image acquired with a 3D contrast-enhanced MPRAGE sequence shows numerous small filling defects (arrowheads), consistent with arachnoid granulations, aligned along the lateral margin of the superior sagittal sinus.

B, Sagittal reconstruction image obtained with a 3D contrast-enhanced MPRAGE imaging sequence shows an array of arachnoid granulations within the superior sagittal sinus.