Pituitary Macroadenoma with Optic Cupping Masquerading as Normal Tension Glaucoma.

When non-glaucomatous disease with disc cupping mimics normal-tension glaucoma (NTG), diagnosis is challenging. The typical optic disc features of glaucomatous disease are often subjective, and often overlap with disc changes in compressive intracranial lesions. Ancillary diagnostic testing such as retinal nerve fiber layer (RNFL) analysis and visual field testing can elevate the index of suspicion of an underlying non-glaucomatous process. We present a case of a nonfunctional macroadenoma coexisting with NTG, although it is unclear if the concurrent brain lesion aggravated or caused it. This case highlights the diagnostic challenge of recognizing optic cupping and non-matching abnormalities in the visual field from a coexisting intracranial lesion, even in the absence of other neurological signs.