Non-Infectious Granulomatous Uveitis Syndromes

Recognizing Granulomatous Uveitis

Before sorting through the systemic differential, the exam itself should tell you that you're looking at a granulomatous process in the first place. Large, greasy "mutton-fat" keratic precipitates — aggregates of epithelioid cells and macrophages deposited on the corneal endothelium — are the single most characteristic sign, classically seen in sarcoidosis, tuberculosis, syphilis, and VKH disease. Iris nodules are the second hallmark: Koeppe nodules sit at the pupillary border, while Busacca nodules appear on the iris stroma away from the margin. Together with thick posterior synechiae, this combination — large mutton-fat KP, iris nodules, and synechiae — is what separates a granulomatous presentation from the fine, dust-like KP and minimal nodularity of a nongranulomatous anterior uveitis.

Once a case is recognized as granulomatous, the differential narrows to a short list of systemic diseases and infections (tuberculosis and syphilis among them — see the infectious uveitis and systemic workup pages for those). The four syndromes below are the non-infectious, systemic-immune members of that differential, each distinguished less by the eye exam itself and more by the pattern of extraocular findings a targeted history and review of systems will uncover.

Vogt-Koyanagi-Harada Disease

VKH disease presents with bilateral panuveitis, but the diagnosis is really made by the history. The disease has a meningeal/neurologic prodrome — headache, tinnitus, and dysacusis — that often precedes or accompanies the ocular findings, reflecting autoimmune targeting of melanocytes not just in the uvea but in the meninges and inner ear as well. Later in the disease course, integumentary findings appear: vitiligo, poliosis (whitening of the eyelashes/eyebrows), and alopecia. In a patient with bilateral granulomatous panuveitis, asking specifically about tinnitus and vitiligo — rather than the more generic joint or skin findings that point toward other entities — is what should prompt suspicion for VKH during history taking.

Sarcoidosis-Associated Uveitis

Sarcoidosis is one of the most common causes of bilateral granulomatous uveitis, and its systemic clues are pulmonary and dermatologic. A patient with bilateral granulomatous panuveitis plus a history of dry cough, dyspnea, and erythema nodosum should be evaluated for sarcoidosis — these findings, together with bilateral hilar lymphadenopathy, define the classic systemic pattern. Workup for suspected sarcoid uveitis typically starts with an inexpensive first-line screening study, chest X-ray, which may show the hilar adenopathy that prompts further imaging with chest CT if the ocular findings are consistent. On the serologic side, serum angiotensin-converting enzyme (ACE) is elevated in a majority of patients with active sarcoidosis and, combined with imaging, supports the diagnosis — though it isn't perfectly sensitive or specific on its own, so a normal ACE doesn't rule sarcoidosis out.

Sarcoidosis also reaches structures outside the uveal tract itself. The lacrimal gland can enlarge on both sides from the same granulomatous process, producing upper-lid fullness and sometimes mild proptosis from the added orbital mass. Tear production falls as the inflamed gland fails, so dry eye is a common companion complaint, not a separate diagnosis. A similar process can seed the conjunctiva: small white-yellow nodules, found in roughly 40% of patients with ocular sarcoidosis, are easy to mistake for ordinary follicular conjunctivitis at first glance. Either finding, a visible conjunctival nodule or an enlarged lacrimal gland, offers a convenient biopsy site that can confirm the diagnosis without going straight to the lung.

Sympathetic Ophthalmia

Sympathetic ophthalmia is a rare, bilateral granulomatous panuveitis that follows penetrating trauma or intraocular surgery to one eye — the injured ("exciting") eye triggers an autoimmune response against uveal antigens that then attacks the fellow ("sympathizing") eye as well. Because the trigger can be remote in time (sympathetic ophthalmia can develop years after the inciting injury), a thorough history of prior ocular trauma or surgery is essential in any patient presenting with bilateral granulomatous panuveitis and no other obvious cause. This page covers sympathetic ophthalmia only as one entry in the granulomatous uveitis differential — for its full immunopathogenesis, the role of Dalen-Fuchs nodules, and detailed management, see the dedicated page in the Ocular Trauma topic.

Behçet's Disease

Behçet's disease is a systemic vasculitis best remembered through its mucocutaneous ulcers: a history of recurrent, painful oral ulcers and genital ulcers in a patient with panuveitis should raise suspicion for Behçet's disease. Ocularly, it's distinguished from the other three syndromes here by its vascular signature — occlusive retinal vasculitis — rather than a purely granulomatous anterior/panuveitis picture, and recurrent oral and genital aphthae together with that retinal vasculitis are hallmark features used in its diagnostic criteria.

High-Yield Pearls

Across all four syndromes, the exam findings alone rarely clinch the diagnosis — it's the targeted review of systems (neurologic/otologic for VKH, pulmonary/dermatologic for sarcoidosis, surgical/trauma history for sympathetic ophthalmia, mucocutaneous for Behçet's) that separates them. Building that history into every granulomatous uveitis workup is the single highest-yield habit for this differential.

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