Educational draft · awaiting clinical reviewThe full textbook explains uncertainty but does not replace live national or local guidance, specialist advice, or current prescribing information.
Recognise pulmonary and multisystem sarcoidosis, secure proportionate diagnostic evidence and treat only when organ threat, disability or unacceptable quality-of-life loss justifies risk.
Pulmonary sarcoidosis ranges from asymptomatic hilar lymphadenopathy to nodular parenchymal disease, airway involvement, progressive fibrosis and pulmonary hypertension. Extrapulmonary manifestations include uveitis, skin lesions, lymphadenopathy, hepatic disease, hypercalcaemia, renal stones, neurosarcoidosis and cardiac disease. The diagnosis requires a compatible syndrome, supportive histology when needed and reasoned exclusion of alternative granulomatous disorders; granulomas themselves are not specific.
Diagnostic intensity should be proportionate. A patient with classic Löfgren syndrome—bilateral hilar lymphadenopathy, erythema nodosum and ankle periarthritis—often has a favourable course and may not need invasive confirmation. By contrast, atypical nodes, constitutional loss, occupational beryllium or silica exposure, immunosuppression or an unusual organ pattern demands broader evaluation for lymphoma, tuberculosis, fungal infection and exposure-related disease before corticosteroids.
The BTS clinical statement emphasises shared decision-making because the evidence base is limited and treatment can create substantial harm. Observation is active care when disease is stable and organs are safe. Corticosteroids remain usual first-line systemic therapy for clinically important pulmonary disease, with
Genetic variation in antigen presentation and immune regulation predisposes certain people to a granulomatous response, with marked differences across ancestry and families.
Inhaled microbial, occupational or inorganic antigens are suspected initiators, but no single exposure explains most cases.
An exaggerated T-cell and macrophage response persists after an unknown antigenic stimulus rather than representing ordinary infection.
Macrophages present an incompletely defined antigen to susceptible T lymphocytes within affected organs, contributing to the resulting loss of respiratory reserve.
Activated T cells and macrophages cluster into compact non-caseating granulomas to contain the perceived stimulus, which links the underlying lesion to the observed respiratory dysfunction.
Granulomas accumulate in lung, lymph nodes, skin, eyes, heart, nervous system or other tissues and alter local function.
Inflammation may resolve spontaneously, persist, or activate fibroblasts and cause permanent architectural distortion, especially in lung.
Incidental symmetrical bilateral hilar and right paratracheal lymphadenopathy with or without cough, breathlessness or chest discomfort is a common presentation, particularly when the person is otherwise well.
Acute erythema nodosum, bilateral ankle periarthritis and bilateral hilar lymphadenopathy form a highly characteristic phenotype that usually carries a favourable prognosis.
Perilymphatic nodules follow bronchovascular bundles and fissures; upper-zone volume loss, traction bronchiectasis and conglomerate fibrosis may produce respiratory impairment and pulmonary hypertension.
Unexplained syncope or presyncope, persistent palpitations, conduction block, ventricular arrhythmia or new heart failure may indicate cardiac sarcoidosis and requires urgent specialist evaluation.
Painful red eye, photophobia, reduced vision, facial weakness, neuropathy, seizures, pituitary symptoms or meningeal features demand rapid organ-specific assessment because delay risks irreversible disability.
Thirst, polyuria, constipation, confusion, nephrolithiasis or renal dysfunction may reflect disordered calcium metabolism and should prompt urgent biochemical assessment when severe.
Epidemiology, constitutional symptoms, necrosis and mycobacterial culture distinguish infection that could worsen catastrophically with immunosuppression, while chronology and directed testing distinguish the competing explanation.
Bulky or asymmetric nodes, systemic symptoms and clonal tissue findings support malignancy; granulomas can occur near tumours and do not automatically exclude them.
Aerospace, electronics or metal-work exposure can produce an indistinguishable granulomatous lung pattern and requires occupational testing.
Antigen-linked bronchiolocentric inflammation, air trapping and poorly formed granulomas favour HP over perilymphatic sarcoidosis, while chronology and directed testing distinguish the competing explanation.
Geographical exposure and fungal microbiology or histology are essential because several endemic mycoses closely mimic sarcoidosis.
Chronic granulomatous inflammation can distort upper-zone airways and vessels, causing restriction, bronchiectasis and respiratory failure, and increasing the burden of otherwise local respiratory disease.
Granulomas and scar in myocardium or conduction tissue cause heart block, ventricular arrhythmia, heart failure and sudden death.
Cranial neuropathy, meningeal, hypothalamic or spinal involvement can cause persistent neurological and endocrine disability, and increasing the burden of otherwise local respiratory disease.
Uveitis and other eye involvement may cause pain, visual loss, glaucoma or cataract if not recognised promptly.
Activated macrophages increase vitamin-D activation, causing hypercalcaemia, stones, nephrocalcinosis and renal impairment in susceptible patients, creating an additional need for recognition and targeted treatment.
Stable, low-risk disease often needs no systemic therapy, but planned physiology, organ screening and safety-netting make observation active management rather than neglect.
Tuberculosis, fungal infection, beryllium, medicines, immune disorders and malignancy-associated reactions can produce granulomas; compatible context and exclusion remain essential.
Traditional radiographic staging describes appearances, not disease activity or a direct treatment ladder. Symptoms and physiology may be discordant with the film.
A patient with modest pulmonary symptoms may still have consequential conduction or myocardial disease, which is why targeted symptom enquiry and baseline ECG matter.
Granulomatous conversion of vitamin D can promote hypercalcaemia. Do not prescribe calcium or vitamin D reflexively without reviewing calcium metabolism and specialist guidance.
Treating a raised ACE level as diagnostic proof or using it alone to escalate corticosteroids.
Biopsying a classic low-risk presentation automatically when the result would not alter management.
Missing tuberculosis, lymphoma or occupational beryllium and silica exposure in an atypical granulomatous presentation.
Starting systemic treatment because a chest radiograph looks dramatic despite stable function and acceptable symptoms.
Failing to ask about syncope, palpitations, visual loss and neurological symptoms at routine pulmonary follow-up.
Giving routine vitamin D replacement without checking calcium-related risk and the local sarcoidosis plan.
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A patient has asymptomatic bilateral hilar lymphadenopathy, normal pulmonary function, normal calcium and no cardiac, eye or neurological features. What is the best general management principle?
National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 27 Aug 2026; clinical approval remains outstanding.
Editorial contact: Doctor’s Passport editorial team. Source-check date is separate from clinical approval. Report a content problem · Content changes
Exclude important infection first and define an outcome before starting. Monitor glucose, blood pressure, mood, weight, eye and bone effects; relapse during taper is common and does not automatically justify indefinite high dosing.
Weekly—not daily—administration is safety critical. Check blood count, liver and renal function, infection and pregnancy status; avoid in pregnancy and investigate new respiratory symptoms for infection, sarcoid progression or methotrexate pneumonitis.