File:Absent septum pellucidum (Radiopaedia 41832-44820 Axial non-contrast 40).png

Summary:

• Radiopaedia case ID: 41832
• Image ID: 18315269
• Image stack position: 40/40
• Plane projection: Axial
• Aux modality: non-contrast
• Study description: CT Brain
• Modality: CT
• System: Central Nervous System
• Findings: Technique: Non-contrast images obtained through the brain. Findings: The septum pellucidum is not clearly visualized. No evidence of fusion of thalami or absence of the corpus callosum. The optic nerves are present. Moderate rounding of the frontal horns of the lateral ventricles is present with upward bowing of the thinned corpus callosum and a 15mm x 9 mm low density lesion in the region of the pineal gland possibly compressing the aqueduct of Sylvius and obstructing CSF flow. No transependymal edema to suggest acute obstruction. No intra or extra-axial hemorrhage, collection or parenchymal contusion. Subtle hyperdensity in the posterior aspect of the middle cranial fossae bilaterally most likely relates to beam hardening artefact rather than traumatic contusion. Dense 5mm focus of plaque-like calcification seen along the lateral wall of the left cavernous sinus may be related calcified meningioma. No skull vault or base of skull fracture. Right parietal scalp hematoma Conclusion: No evidence of traumatic brain injury. Apparent absence of the septum pellucidum raises the possibility of mild abnormality in the spectrum of lobar holoprosencephaly/septo-optic dysplasia and congenital midline malformation.15 x 9 millimeter low density pineal gland lesion with fourth ventricular dilatation raises the possibility of chronic hydrocephalus which may produce a fenestrated appearance to the septum pellucidum. 5 mm focus of calcification involving the lateral wall of the left cavernous sinus may reflect dural calcification associated with a meningioma. Clinical correlation and further the MRI imaging may help delineate the above findings.
• Published: 22nd Dec 2015
• Source: https://radiopaedia.org/cases/absent-septum-pellucidum
• Author: Bruno Di Muzio
• Permission: http://creativecommons.org/licenses/by-nc-sa/3.0/

Licensing:

CC-BY-NC-SA-3.0