Confusable diagnoses · PANCE / PANRE

Polymyalgia Rheumatica vs Giant Cell Arteritis

Written & clinically reviewed by Ryan Busch, PA-C · Updated August 2026 · Report an error

Polymyalgia Rheumatica and Giant Cell Arteritis are easy to mix up on the boards. Here's a side-by-side comparison — presentation, workup, imaging, and first-line treatment — drawn from our full outlines.

Polymyalgia Rheumatica vs Giant Cell Arteritis at a glance

  • Polymyalgia Rheumatica: Inflammatory syndrome of shoulder and hip girdle stiffness in adults over 50; dramatic response to low-dose steroids.
  • Giant Cell Arteritis: Large- and medium-vessel vasculitis in adults over 50; threatens vision and demands empiric high-dose steroids.

Try two board-style questions on Polymyalgia Rheumatica vs Giant Cell Arteritis

Real questions from the FirstPassPA bank, with the full explanation. Pick an answer — no signup, no email.

Question 1MusculoskeletalEasy
A 72-year-old woman presents with 6 weeks of bilateral aching and stiffness in her shoulders, neck, and hips, worst in the morning and lasting more than an hour. She has difficulty getting out of bed and lifting her arms to comb her hair. She reports fatigue and a 6 lb weight loss but no muscle weakness on formal testing. ESR is 92 mm/hr and CRP is markedly elevated. Creatine kinase is normal. Which is the most likely diagnosis?
  • APolymyalgia rheumatica
  • BRheumatoid arthritis
  • CInflammatory polymyositis
  • DFibromyalgia syndrome
Reveal answer & full explanation
Correct answer: A — Polymyalgia rheumatica
  • APolymyalgia rheumatica✓
  • BRheumatoid arthritis
  • CInflammatory polymyositis
  • DFibromyalgia syndrome

Why Polymyalgia rheumatica is correct

  • Polymyalgia rheumatica (PMR) classically affects adults over age 50 and presents with bilateral shoulder and pelvic girdle aching and stiffness, prolonged morning stiffness (lasting more than an hour), constitutional symptoms, and markedly elevated ESR and CRP.
  • Formal muscle testing shows no true weakness in PMR — pain limits effort — and creatine kinase (CK) is normal, distinguishing PMR from polymyositis.
  • PMR responds dramatically to low-dose prednisone (15–20 mg/day), and the rapid response is itself supportive of the diagnosis.

Why the others are wrong

  • Inflammatory polymyositis — produces true proximal muscle weakness on formal testing and an elevated creatine kinase; both are absent here.
  • Fibromyalgia syndrome — has normal inflammatory markers and widespread tender points without elevated ESR or CRP.
  • Rheumatoid arthritis — typically involves small joints (metacarpophalangeal (MCP), proximal interphalangeal (PIP), wrist) symmetrically with synovitis, rather than the bilateral shoulder and pelvic girdle pattern seen here.
Question 2EENTMedium
A 68-year-old woman presents with new severe unilateral right temporal headache, jaw pain when chewing, scalp tenderness, and visual blurring in the right eye. ESR is 88 mm/hr and CRP is elevated. Which is the most immediate action?
  • ALong-segment right temporal artery biopsy
  • BHigh-dose prednisone 1 mg/kg/day immediately
  • COutpatient rheumatology referral
  • DMRI brain with diffusion-weighted imaging
Reveal answer & full explanation
Correct answer: B — High-dose prednisone 1 mg/kg/day immediately
  • ALong-segment right temporal artery biopsy
  • BHigh-dose prednisone 1 mg/kg/day immediately✓
  • COutpatient rheumatology referral
  • DMRI brain with diffusion-weighted imaging

Why High-dose prednisone 1 mg/kg/day immediately is correct

  • Giant cell arteritis (GCA) is an ophthalmic emergency in patients over 50
  • Classic presentation: new temporal headache, jaw claudication, scalp tenderness, elevated ESR/CRP
  • Visual symptoms (amaurosis, diplopia) herald irreversible ischemic optic neuropathy and blindness within hours to days
  • Treatment must NOT be delayed for biopsy — high-dose prednisone (1 mg/kg/day) must be started immediately upon clinical suspicion

Why the others are wrong

  • Long-segment right temporal artery biopsy — performing the biopsy first delays steroids and risks irreversible vision loss; biopsy can be performed within 2 weeks of steroid initiation and remains diagnostic
  • Outpatient rheumatology referral — inappropriate urgency given imminent risk of permanent blindness
  • MRI brain with diffusion-weighted imaging — delays vision-saving steroids without altering the immediate management of GCA; monocular blurring with jaw claudication points to arteritic ischemic optic neuropathy, not a cortical stroke

Additional high-yield points

  • Oral prednisone is dosed at 1 mg/kg/day to a maximum of about 60 mg/day; with threatened or actual vision loss, IV pulse methylprednisolone (500-1000 mg daily for 3 days) may be given first (ACR 2021, BSR 2020)
  • A long-segment (at least 1 cm) temporal artery biopsy remains the diagnostic standard; temporal artery ultrasound showing a halo sign is an accepted alternative in experienced centers
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Side-by-side comparison

FeaturePolymyalgia RheumaticaGiant Cell Arteritis
At a glanceInflammatory syndrome of shoulder and hip girdle stiffness in adults over 50; dramatic response to low-dose steroids.Large- and medium-vessel vasculitis in adults over 50; threatens vision and demands empiric high-dose steroids.
Classic presentationSubacute onset of bilateral shoulder and hip girdle aching and stiffness; Morning stiffness >45 minutes (often hours); Difficulty rising from a chair or lifting arms above the head; Constitutional symptoms in 30-50%: fatigue, low-grade fever, anorexia, weight loss; No true muscle weakness once pain is controlled; Restricted active…New persistent unilateral temporal or occipital headache; Scalp tenderness (painful to comb hair or wear glasses); Jaw claudication — fatigue or pain in masseter with chewing (highly specific); Tongue claudication (rare but specific); Visual symptoms: amaurosis fugax, diplopia, sudden monocular vision loss; Constitutional: fever,…
Workup / key labs2012 EULAR/ACR provisional criteria: age ≥50, bilateral shoulder pain, abnormal CRP or ESR, plus weighted morning stiffness, hip involvement, absence of other joint pain, and absence of RF/anti-CCP.; ESR — characteristically >40 mm/h (often >50-100); CRP elevated and may be more sensitive; CBC — normochromic normocytic anemia,…ACR/EULAR 2022 classification criteria use weighted clinical, laboratory, imaging, and biopsy features in patients ≥50 with suspected medium- or large-vessel vasculitis.; ESR — characteristically >50 mm/h (often >100); CRP elevated and often more sensitive; CBC — normochromic anemia, thrombocytosis; LFTs — mild alkaline phosphatase…
ImagingShoulder ultrasound or MRI — subacromial-subdeltoid bursitis, biceps tenosynovitis, glenohumeral synovitis (supportive but not required); Temporal artery ultrasound or biopsy if GCA features develop; PET-CT in atypical cases — can show large-vessel uptakeTemporal artery biopsy — gold standard; ≥1 cm specimen; can be performed up to 2 weeks after starting steroids; skip lesions mean a contralateral biopsy may be needed if first negative and suspicion high; Temporal artery ultrasound — 'halo sign' (hypoechoic wall edema), increasingly used as first-line in expert centers; MRA, CTA, or…
First-line treatmentPrednisone 12.5-25 mg/day — dramatic improvement within 48-72 hours is both therapeutic and diagnostic; Slow taper over 1-2 years guided by symptoms and inflammatory markers (EULAR/ACR 2015: taper to 10 mg/day within 4-8 weeks, then by 1 mg every 4 weeks until discontinuation while remission is maintained); Bone-protective therapy:…Do not wait for biopsy — start glucocorticoids immediately when GCA is clinically suspected; Prednisone 40-60 mg/day if no visual symptoms; IV methylprednisolone 500-1000 mg daily for 3 days then high-dose oral prednisone if visual symptoms or recent vision loss; Slow taper over 12-24 months guided by symptoms and ESR/CRP; Aspirin is…

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Full outlines

Polymyalgia Rheumatica (PMR) Giant Cell Arteritis (GCA) All 514 diagnoses

Educational use only. This outline is a study aid for PA students and is not medical advice or a substitute for clinical judgment. FirstPassPA is an independent study tool and is not affiliated with, endorsed by, or sponsored by NCCPA or PAEA. PANCE® and PANRE® are registered trademarks of the National Commission on Certification of Physician Assistants; End of Rotation™ is a program of the Physician Assistant Education Association.