Retinal Marker Flags Giant Cell Arteritic Optic Nerve Damage
A multicenter US study finds a retinal OCT pattern that rarely appears in arteritic optic nerve injury but shows high specificity.
Updated on Nov. 2, 2026 in Stroke
A multicenter US study published online October 23, 2026, in the American Journal of Ophthalmology evaluated paracentral acute middle maculopathy (PAMM) as a diagnostic marker for arteritic anterior ischemic optic neuropathy (AAION). The analysis of 119 patients aged 50 and older found PAMM in 18.5% of AAION cases and 5.4% of nonarteritic cases.
Why it matters
Giant cell arteritis is a serious inflammatory condition that can cause permanent vision loss, so a reliable imaging marker could help clinicians distinguish arteritic from nonarteritic optic nerve injury. The study suggests PAMM is highly specific but insensitive, meaning its presence is informative while its absence does not rule out the condition.
The study reported 94.6% specificity but only 19% sensitivity for PAMM in detecting AAION, with a 50% positive predictive value in this 119-patient cohort. Because the sample included just 27 AAION cases, these estimates carry substantial uncertainty and were not validated in a larger general population.
The players
American Journal of Ophthalmology
A peer-reviewed clinical journal that publishes original research in ophthalmology and vision science.
The details
Researchers examined optical coherence tomography scans and identified PAMM as a hyperreflective band in the inner nuclear layer, reflecting ischemia in the intermediate and deep retinal capillary plexuses. Five NAION patients with PAMM included three who had severe systemic events associated with reduced perfusion.
Timeline
January 2020 to January 2025: Patients included in the study cohort were diagnosed.
October 23, 2026: The study was published online ahead of print in the American Journal of Ophthalmology.
Diagnostic Context
The study builds on the use of optical coherence tomography to examine retinal layers in neuro-ophthalmic disease. It tests whether a specific retinal pattern can separate giant cell arteritis-related optic nerve injury from its nonarteritic counterpart.
For patients with unexplained sudden vision loss, a PAMM finding may prompt earlier evaluation for giant cell arteritis. Because sensitivity is low, a normal scan should not be taken as reassurance without further clinical workup.
The takeaway
Retinal imaging can add useful information in suspected optic nerve ischemia, but a negative result does not exclude giant cell arteritis. Clinicians should continue to rely on the full diagnostic picture, including systemic symptoms and inflammatory markers.
Further reading
For more on related vascular conditions, explore our Stroke coverage.
