T2 weighted magnetic resonance imaging (MRI) of the head in axial view. This is a T2 weighted magnetic resonance imaging (MRI) of the head in axial view that is showing the anteroposterior extent of the cyst of the cavum septum pellucidum along with the cavum vergae. The 3 X 1.7 cm cyst is appreciable in this section with definite bowing of the lateral walls.