The correlation study between posterior fossa crowding and classical trigeminal neuralgia

Area of Science:

• Neurosurgery
• Radiology
• Neurology

Background:

• Trigeminal neuralgia (TN) is a debilitating neuropathic pain condition.
• The etiology of classical TN is often linked to neurovascular conflict (NVC).
• Posterior fossa anatomy may play a role in the development of NVC and subsequent TN.

Purpose of the Study:

• To investigate the association between posterior fossa crowding and classical trigeminal neuralgia (TN).
• To quantify posterior fossa volume (PFV) and hindbrain volume (HBV) to calculate the posterior fossa crowding index (PFCI).

Main Methods:

• A case-control study included 60 TN patients and 60 healthy controls.
• High-resolution 3D MRI (3D-FIESTA and 3D-TOF MRA) was performed on all subjects.
• 3D-slicer software was used for PFV and HBV measurements, calculating PFCI (HBV/PFV × 100%).

Main Results:

• The average PFCI was significantly higher in TN patients (85.0% ± 3.9%) compared to controls (82.7% ± 3.9%, P=0.025).
• Female TN patients exhibited greater posterior fossa crowding than male TN patients (86.4% ± 3.8% vs. 83.4% ± 3.4%, P=0.033).
• Higher PFCI correlated with female sex, younger age, and TN diagnosis.

Conclusions:

• Patients with TN demonstrate a more crowded posterior fossa than healthy individuals.
• Posterior fossa crowding may represent a risk factor for neurovascular conflict, increasing the likelihood of developing TN.
• The PFCI serves as a quantifiable measure potentially aiding in understanding TN pathogenesis.