Temporal Lobe Parenchyma Herniation into the Transverse Sinus: MRI Findings in a Case

Area of Science:

• Neurology
• Radiology
• Neuroimaging

Background:

• Brain parenchyma herniation into dural venous sinuses is an uncommon condition.
• This entity can present as dural venous sinus filling, mimicking sinus thrombosis or other pathologies.
• Accurate diagnosis is crucial to differentiate from critical conditions.

Purpose of the Study:

• To report a rare case of spontaneous occult herniation of temporal lobe tissue into the left transverse sinus.
• To describe the characteristic magnetic resonance imaging (MRI) findings of this entity.
• To discuss the potential association with clinical symptoms like headache.

Main Methods:

• Case report detailing a patient with spontaneous temporal lobe herniation into the left transverse sinus.
• Review of magnetic resonance imaging (MRI) sequences to characterize the herniated tissue.
• Correlation of imaging findings with clinical presentation.

Main Results:

• The herniated brain parenchyma was isointense to normal brain tissue on all MRI sequences.
• A cerebrospinal fluid (CSF) rim surrounded the herniated tissue.
• The herniated tissue was contiguous with the brain parenchyma, specifically the temporal lobe, and located within the left transverse sinus.

Conclusions:

• Spontaneous occult herniation of brain parenchyma into a dural venous sinus is a rare finding.
• MRI characteristics include isointensity, a CSF rim, and contiguity with brain tissue.
• This entity can mimic sinus thrombosis but represents a distinct pathological process, potentially associated with symptoms such as headache.