-15-20 mm posterior to the tip of the frontal horn of the lateral ventricle for each brain hemisphere, initial lesions are made 2-5 mm above the upper surface of the corpus callosum and 7 mm away from the midline laterally (the midline is generally determined by the
falx cerebri).
Magnetic resonance imaging (MRI) of the brain demonstrated a collection of fluid along the right
falx cerebri and cerebellar tentorium and shift of brain parenchyma to the left [Figure 1].
Axial nonenhanced CT [NECT, Figure 1) shows an extra-axial, left parasagittal mass associated with the anterior
falx cerebri.
Other findings include follicular hyperkeratosis, hyperhidrosis, nail dystrophy, calcification of
falx cerebri and choroid plexus.8
[16] The brain itself, although can be considered homogeneous, is separated into three major compartments: two cerebral hemispheres and post fossa, by the cerebral
falx and cerebellar tentorium.
(8) Lesions in the cerebral
falx that involve bilateral medial aspects of the frontal lobe result in attention deficits in complex tasks.
An MRI of the brain showed minimal dilation in the subarachnoid space and a focal 1 cm lipoma in the anterior
falx cerebri, but was otherwise unremarkable.
An interface between the
falx and cortex is identified and an inter-hemispheric corridor not exceeding 5cm in length and 2 cm in width was developed using a 2 cm retractor blade (fig-2).
(4,5) Other characteristic findings in SUFU-related GS include
falx calcifications, sensitivity to radiation and subsequent second primary tumors in the radiation fields, and a strong family predisposition.
Falx calcification is observed in 65% of patients and this calcification is not found in early childhood (3).