Table 1 Potential differential diagnoses for those suspected with GCA.

From: Giant cell arteritis: reviewing the advancing diagnostics and management

Diagnostic sieve

Potential differential diagnosis for those with suspected GCA

Ocular causes

Non-arteritic anterior ischaemic optic neuropathy

Angle closure glaucoma

Regional causes

Carotid artery occlusive disease

Intracranial pathology (such as pituitary apoplexy or cavernous sinus lesion)

Migraine

Cluster headache

Trigeminal neuralgia

TMJ dysfunction

Dental pain

Cervical spondylosis

Infections

Herpes zoster ophthalmicus

Varicella zoster

Otitis external

Sinusitis

Dental abscess

Systemic conditions

Multiple myeloma

Amyloidosis

Other vasculitides (such as granulomatosis polyangiitis)