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Caplan's syndrome

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Subject: Occupational lung disease, Pneumoconiosis, List of MeSH codes (C05), Caplan, List of MeSH codes (C21)
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Caplan's syndrome

Caplan's syndrome
Classification and external resources
ICD-10 J99.0 M05.1
ICD-9-CM 714.81
DiseasesDB 1961
MedlinePlus 000137
MeSH D002205

Caplan's syndrome (or Caplan disease or Rheumatoid pneumoconiosis[1]) is a combination of rheumatoid arthritis (RA) and pneumoconiosis that manifests as intrapulmonary nodules, which appear homogenous and well-defined on chest X-ray.[2]


  • Signs and symptoms 1
  • Causes 2
  • Pathophysiology 3
  • Diagnosis 4
  • Management 5
  • Prognosis 6
  • Epidemiology 7
  • History 8
  • References 9
  • External links 10

Signs and symptoms

Caplan syndrome presents with cough and shortness of breath in conjunction with features of rheumatoid arthritis, such as painful joints and morning stiffness. Examination should reveal tender, swollen metacarpophalangeal joints and rheumatoid nodules; auscultation of the chest may reveal diffuse râles that do not disappear on coughing or taking a deep breath.

Caplan syndrome is a nodular condition of the lung occurring in dust-exposed persons with either a history of rheumatoid arthritis (RA) or who subsequently develop RA within the following 5–10 years.[3] The nodules in the lung typically occur bilaterally and peripherally, on a background of simple CWP. There are usually multiple nodules, varying in size from 0.5 to 5.0 cm. The nodules typically appear rapidly, often in only a few weeks. Nodules may grow, remain unchanged in size, resolve, or disappear and then reappear. They can cavitate, calcify, or develop air-fluid levels. Grossly, they can resemble a giant silicotic nodule. Histologically, they usually have a necrotic center surrounded by a zone of plasma cells and lymphocytes, and often with a peripheral inflammatory zone made of macrophages and neutrophils.


Caplan syndrome occurs only in patients with both RA and pneumoconiosis related to mining dust (coal, asbestos, silica). The condition occurs in miners (especially those working in anthracite coal-mines), asbestosis, silicosis and other pneumoconioses. There is probably also a genetic predisposition, and smoking is thought to be an aggravating factor.


The presence of rheumatoid arthritis alters how a person's immune system responds to foreign materials, such as dust from a coal mine.[1] When a person with rheumatoid arthritis is exposed to such offensive materials, they are at an increased risk of developing pneumoconiosis.[1]



Once tuberculosis has been excluded, treatment is with steroids. All exposure to coal dust must be stopped, and smoking cessation should be attempted. Rheumatoid arthritis should be treated normally with early use of DMARDs.


The nodules may pre-date the appearance of rheumatoid arthritis by several years. Otherwise prognosis is as for RA; lung disease may remit spontaneously, but pulmonary fibrosis may also progress.


Incidence is currently 1 in 100,000 people but is likely to fall as the coal mining industry declines. It has also been shown to occur in cases of complicated silicosis (marked by progressive massive pneumoconiosis).


The syndrome is named after Dr. Anthony Caplan, a physician on the Cardiff Pneumoconiosis Panel, who identified the constellation of findings as a distinct entity in a 1953 publication.[4] He followed this with further articles exploring the disease.[5][6] Caplan syndrome was originally described in coal miners with progressive massive fibrosis.


  1. ^ a b c Murray, John F. (2010). Murray and Nadel's textbook of respiratory medicine. (5th ed.). Philadelphia, PA: Saunders/Elsevier. p. 1566.  
  2. ^ Ondrasík M (1989). "Caplan syndrome". Baillieres Clin Rheumatol 3 (1): 205–10.  
  3. ^ Caplan A (March 1953). "Certain unusual radiological appearances in the chest of coal-miners suffering from rheumatoid arthritis". Thorax 8 (1): 29–37.  
  4. ^ Caplan, Anthony (1953). "Certain Unusual Radiological Appearances in the Chest of Coal-miners Suffering from Rheumatoid Arthritis". Thorax 8 (1): 29–37.  
  5. ^ Miall, W. E.; Anthony Caplan; A. L. Cochrane; G. S. Kilpatrick; P. D. Oldham (1953-12-05). "Rheumatoid Arthritis Associated with Characteristic Chest X-ray Appearances in Coal-workers". British Medical Journal 2 (4848): 1231–1236.  
  6. ^ Caplan, A.; R. B. Payne; J. L. Withey (September 1962). "A Broader Concept of Caplan Syndrome Related to Rheumatoid Factors". Thorax 17 (3): 205–212.  

External links

  • 932839427 at GPnotebook
  • Chest CT Caplan Syndrome Radiology
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