Lumbar puncture with CSF analysis in IIH evaluation is performed to do what?

Lumbar puncture with CSF analysis in IIH evaluation is performed to do what?

• A. Measure intraocular pressure
• B. Assess CSF pressure and rule out other etiologies
• C. Detect retinal detachment
• D. Evaluate corneal thickness

Answer: (B)

In evaluating suspected idiopathic intracranial hypertension, a lumbar puncture with CSF analysis is used to measure CSF opening pressure and to examine the fluid for clues that help rule out other causes of raised intracranial pressure. An elevated opening pressure supports the diagnosis of IIH, while CSF analysis helps exclude infections, inflammatory processes, hemorrhage, or other etiologies that could mimic IIH. The other options involve tests not addressing CSF pressure or the need to exclude alternative causes: measuring intraocular pressure is done with tonometry, retinal detachment is detected by a dilated eye exam, and corneal thickness is measured with pachymetry.

In evaluating suspected idiopathic intracranial hypertension, a lumbar puncture with CSF analysis is used to measure CSF opening pressure and to examine the fluid for clues that help rule out other causes of raised intracranial pressure. An elevated opening pressure supports the diagnosis of IIH, while CSF analysis helps exclude infections, inflammatory processes, hemorrhage, or other etiologies that could mimic IIH. The other options involve tests not addressing CSF pressure or the need to exclude alternative causes: measuring intraocular pressure is done with tonometry, retinal detachment is detected by a dilated eye exam, and corneal thickness is measured with pachymetry.