Disorders affecting the fourth ventricle: etiology and clinical correlates

Area of Science:

• Neurology
• Neurosurgery
• Otolaryngology

Background:

• The fourth ventricle is a critical brain structure housing the brainstem and cerebellum.
• Lesions in this area can manifest as cerebellar or brainstem symptoms, including vertigo and ataxia.
• Diagnosing fourth ventricle disorders is challenging due to their complex presentation.

Purpose of the Study:

• To review the diagnostic experience of fourth ventricle disorders over 15 years.
• To identify key clinical and diagnostic features of these lesions.
• To highlight the prognostic implications and diagnostic challenges.

Main Methods:

• Retrospective study of 13 patients with fourth ventricle tumors/strokes.
• Analysis of audiovestibular function tests, including electronystagmography and vestibular-evoked myogenic potentials.
• Correlation of clinical findings with imaging (MRI) and final diagnoses.

Main Results:

• All patients presented with vertigo, followed by ataxia and nausea/vomiting.
• Persistent nystagmus was observed in 68% of patients.
• Audiovestibular tests, particularly electronystagmography and vestibular-evoked myogenic potentials, revealed central brainstem involvement, sometimes not evident on MRI.
• Diagnoses included various tumors and one cavernoma; 77% of patients died within 2 years.

Conclusions:

• Ataxia, persistent vomiting, and nystagmus in vertiginous patients warrant consideration of fourth ventricle lesions.
• Electronystagmography and vestibular-evoked myogenic potentials can supplement MRI in diagnosing these lesions.
• Fourth ventricle lesions have a poor prognosis, emphasizing the need for early and accurate diagnosis.