Clinical Signs of Sarcoidosis

Highly Probable Clinical Features

• The American Thoracic Society suggests that lupus pernio, a chronic violaceous skin lesion, is a highly specific finding for sarcoidosis, typically on the nose, cheeks, and ears 1, 2
• Erythema nodosum, tender raised nodules on the shins, is often associated with Löfgren's syndrome, a highly probable indicator of sarcoidosis 1, 2
• Uveitis, inflammation of the uveal tract, is one of the most common extrapulmonary manifestations of sarcoidosis 1, 2
• Optic neuritis, inflammation of the optic nerve, is a probable clinical feature of sarcoidosis 1, 2
• Löfgren's syndrome, a triad of bilateral hilar adenopathy, erythema nodosum, and/or periarticular arthritis, is so specific that it does not require histological confirmation 1, 2

Probable Clinical Features

• Maculopapular, erythematous, or violaceous skin lesions are common manifestations of sarcoidosis 1, 2
• Subcutaneous nodules are a probable clinical feature of sarcoidosis 1, 2
• Scleritis and retinitis are ocular signs of sarcoidosis 1, 2
• Lacrimal gland swelling is a probable clinical feature of sarcoidosis 1, 2
• Seventh cranial nerve paralysis (facial nerve palsy) is a neurologic finding in sarcoidosis 1, 2
• Neurosarcoidosis occurs in approximately 5-15% of patients, often presenting with seizures due to parenchymal brain involvement 3
• New-onset third-degree AV block in young or middle-aged adults is a critical cardiac manifestation of sarcoidosis 1, 2
• Treatment-responsive cardiomyopathy or AV node block is a probable clinical feature of sarcoidosis 1, 2
• Spontaneous or inducible ventricular tachycardia without traditional risk factors is a cardiac manifestation of sarcoidosis 1, 2
• Reduced left ventricular ejection fraction without other risk factors is a probable clinical feature of sarcoidosis 1, 2
• Symmetrical parotid gland enlargement is a head and neck sign of sarcoidosis 1, 2
• Granulomatous lesions on direct laryngoscopy are a probable clinical feature of sarcoidosis 1, 2
• Hepatomegaly and/or splenomegaly are abdominal findings in sarcoidosis 1, 2
• Hepatic involvement presents with elevated liver enzymes and imaging showing enlargement or nodules 3
• Treatment-responsive renal failure is a renal manifestation of sarcoidosis 1, 2
• Nephrolithiasis with calcium stones is a probable clinical feature of sarcoidosis 1, 2

Imaging Findings as Clinical Signs

• Bilateral hilar adenopathy is the most characteristic radiographic finding, present in approximately 90% of cases 1, 2
• Perilymphatic nodules on chest CT are a probable clinical feature of sarcoidosis 1, 2
• Upper lobe or diffuse pulmonary infiltrates are imaging findings in sarcoidosis 1, 2

Critical Pitfalls to Avoid

• Failure to recognize cardiac involvement is particularly dangerous, as cardiac sarcoidosis carries significant mortality risk and may present subtly with conduction abnormalities before progressing to life-threatening arrhythmias 4, 5, 1, 2
• Insufficient monitoring for extrapulmonary manifestations can lead to delayed diagnosis, particularly for neurosarcoidosis which affects 5-15% of patients and requires aggressive treatment 5, 3
• Inadequate exclusion of infections is the most common cause of misdiagnosis, as granulomatous diseases from tuberculosis, fungal infections, and other causes can mimic sarcoidosis exactly 5