Pituitary and Optic Tract Lesions Masquerading As Glaucoma: Highlighting Diagnostic Challenges

TL;DR

This paper discusses how pituitary and optic tract lesions can look like glaucoma, leading to diagnostic challenges and the need for careful evaluation.

Contribution

The study highlights diagnostic challenges in differentiating glaucoma from compressive optic neuropathies due to intracranial lesions.

Findings

Six patients with suspected glaucoma were found to have intracranial lesions on neuroimaging.

Atypical visual field defects and optic disc features helped identify non-glaucomatous causes.

Pituitary macroadenomas were the most common lesion found in these patients.

Abstract

Purpose

This study's purpose is to highlight the diagnostic pitfalls in distinguishing glaucomatous optic neuropathy from compressive optic neuropathies caused by intracranial lesions, particularly pituitary macroadenomas.

Methodology

This research was a retrospective case series of six patients who were originally diagnosed or suspected to have glaucomatous optic neuropathy but later revealed intracranial lesions on neuroimaging.

Results

All patients had optic disc cupping and/or pallor with visual field defects (VFDs) overlapping with glaucomatous patterns. However, atypical features such as VFDs respecting the vertical meridian, homonymous hemianopia, optic disc pallor disproportionate to cupping, and poor correlation between structure and function raised suspicion for non-glaucomatous causes. Neuroimaging revealed pituitary macroadenoma in four patients, parasellar meningioma in one, and an optic tract lesion in another.

Conclusion

Compressive optic neuropathies may closely mimic glaucoma, resulting in delayed diagnosis and inappropriate treatment. Careful attention to atypical field patterns and disc findings, combined with timely neuroimaging, is crucial for avoiding irreversible vision loss.

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