| Sarcoidosis | |
|---|---|
| Classification and external resources | |
Chest xray showing the typical nodularity of sarcoidosis in the base of the lungs. |
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| ICD-10 | D86 |
| ICD-9 | 135 |
| OMIM | 181000 |
| DiseasesDB | 11797 |
| MedlinePlus | 000076 |
| eMedicine | med/2063 |
| MeSH | D012507 |
Sarcoidosis (from sarc meaning flesh, -oid, like, and -osis, diseased or abnormal condition), also called sarcoid, Besnier-Boeck disease or Besnier-Boeck-Schaumann disease, is a disease in which abnormal collections of chronic inflammatory cells (granulomas) form as nodules in multiple organs.[1] The cause of sarcoidosis is unknown. Granulomas most often appear in the lungs or the lymph nodes, but virtually any organ can be affected. Normally the onset is gradual. Sarcoidosis may be asymptomatic or chronic. It commonly improves or clears up spontaneously. More than 2/3 of people with lung sarcoidosis have no symptoms after 9 years. About 50% have relapses. About 10% develop serious disability. Lung scarring or infection may lead to respiratory failure and death.[1] Chronic patients may deal with waxing and waning symptoms over many years.[2]
Contents |
Sarcoidosis is a systemic disease that can affect any organ. Common symptoms are vague, such as fatigue unchanged by sleep, lack of energy, weight loss, aches and pains, arthritis, dry eyes, swelling of the knees, blurry vision, shortness of breath, a dry hacking cough or skin lesions. Sarcoidosis and cancer may mimic one another, making the distinction difficult.[4] The cutaneous symptoms vary, and range from rashes and noduli (small bumps) to erythema nodosum or lupus pernio. It is often asymptomatic.
The combination of erythema nodosum, bilateral hilar lymphadenopathy and arthralgia is called Löfgren syndrome. This syndrome has a relatively good prognosis.
Renal, liver (including portal hypertension), heart[5] or brain involvement may cause further symptoms and altered functioning.
Of individuals with sarcoidosis, 90 percent have an abnormal chest x-ray at some time during their course. Overall, approximately 50 percent develop permanent pulmonary abnormalities and 5 to 15 percent have progressive fibrosis of the lung parenchyma. Sarcoidosis of the lung is primarily an interstitial lung disease in which the inflammatory process involves the alveoli, small bronchi, and small blood vessels. In acute and subacute cases, the physical examination usually reveals dry rales.[6]
Although liver biopsy reveals liver involvement in 60 to 90 percent of cases, liver dysfunction is usually not important clinically. Approximately 20–30% have hepatomegaly and/or biochemical evidence of liver involvement. Usually these changes reflect a cholestatic pattern and include an elevated alkaline phosphatase level; the bilirubin and aminotransferases are only mildly elevated. Jaundice is rare.[6]
Sarcoidosis involves the skin in about 25 percent of patients. The most common lesions are erythema nodosum, plaques, maculopapular eruptions, subcutaneous nodules, and lupus pernio. Treatment is not required, since the lesions usually resolve spontaneously in 2 to 4 weeks. Although it may be disfiguring, cutaneous sarcoidosis rarely causes major problems.[6]
Although cardiac involvement is present in 20% to 30% of patients with sarcoidosis, only about 5% of patients with systemic sarcoidosis are symptomatic.[7]
The presentation of cardiac sarcoidosis can range from asymptomatic conduction abnormalities to fatal ventricular arrhythmia.[8] Myocardial sarcoidosis can be a rare cause of sudden cardiac death.[9][10]
Manifestations in the eye include uveitis, uveoparotitis, and retinal inflammation, which may result in loss of visual acuity or blindness. The combination of anterior uveitis, parotitis, VII cranial nerve paralysis and fever is called uveoparotid fever, and is associated with Heerfordt-Waldenstrom syndrome. (D86.8)
Abnormal clinical blood tests are frequent but not diagnostic. Anemia occurs in 4-20% of patients with sarcoidosis. Leukopenia (due to a reduced number of circulating lymphocytes [11] or lymphopenia) occurs in as many as 40% of patients but is rarely severe. In the absence of splenomegaly, leukopenia may reflect bone marrow involvement, however, the most common mechanism is a redistribution of blood T cells to sites of disease.[12] Other non-specific findings include monocytosis, occurring in the majority of sarcoidosis cases,[13] increased hepatic enzymes or alkaline phosphatase. Hypercalciuria and hypercalcemia are seen in <10% of patients.[14]
Lymphadenopathy is very common in sarcoidosis. Intrathoracic nodes are enlarged in 75 to 90 percent of all patients; usually this involves the hilar nodes, but the paratracheal nodes are commonly involved. Peripheral lymphadenopathy is very common, particularly involving the cervical (the most common head and neck manifestation of the disease [15]), axillary, epitrochlear, and inguinal nodes. Palpation causes no pain.[6]
All components of the nervous system can be involved in sarcoidosis. Sarcoidosis affecting the brain or nerves is known as neurosarcoidosis. Neurologic findings are observed in about 5 percent of patients. Seventh nerve involvement with unilateral facial paralysis is most common. It occurs suddenly and is usually transient. Other common manifestations of neurosarcoid include optic nerve dysfunction, papilledema, palate dysfunction, hearing abnormalities, hypothalamic and pituitary abnormalities, chronic meningitis, and peripheral neuropathy.[6] Intramedullary sarcoidosis is rare and occurs in less than 1% of cases. There is usually granulomatous involvement of the basal meninges that subsequently affects the cranial nerves. Myelopathy may be the initial clinical presentation of intramedullary neurosarcoidosis.[16]
Parotid enlargement is a classic feature of sarcoidosis, but clinically apparent parotid involvement occurs in less than 10 percent of patients. Bilateral involvement is the rule. The gland is usually nontender, firm, and smooth. Xerostomia can occur; other exocrine glands are affected only rarely.[6]
Sarcoidosis of the scalp presents with diffuse or patchy hair loss.[17]:762
The exact cause of sarcoidosis is not known. The current working hypothesis is that in genetically susceptible individuals sarcoidosis is caused through alteration in immune response after exposure to an environmental, occupational, or infectious agent.[18]
Investigations of genetic susceptibility yielded many candidate genes but only few were confirmed by further investigations and no reliable genetic markers are known. Currently, the most interesting candidate gene is BTNL2; several HLA-DR risk alleles are also being investigated.[19] In persistent sarcoidosis the HLA haplotype HLA-B7-DR15 are either cooperating in disease or another gene between these two loci is associated. In non-persistent disease there is a strong genetic association with HLA DR3-DQ2.[20] Siblings have only a modestly increased risk (hazard ratio 5-6) of developing the disease, indicating that genetic susceptibility plays only a small role. The alternate hypothesis that family members share similar exposures to environmental pathogens is quite plausible to explain the apparent hereditary factor.
Several infectious agents appear to be significantly associated with sarcoidosis but none of the known associations is specific enough to suggest a direct causative role. Propionibacterium acnes can be found in bronchoalveolar lavage of approximately 70% patients and is associated with disease activity, however it can be also found in 23% of controls.[21][22] A recent meta-analysis investigating the role of mycobacteria in sarcoidosis found it was present in 26.4% of cases, however the meta-analysis also detected a possible publication bias, so the results need further confirmation.[23][24]
There have also been reports of transmission of sarcoidosis via organ transplants.[25]
Sarcoidosis frequently causes an increase in vitamin D production outside the kidney.[26] Macrophages inside the granulomas convert vitamin D to its active form, resulting in elevated levels of the hormone 1,25-dihydroxyvitamin D and symptoms of hypervitaminosis D that may include fatigue, lack of strength or energy, irritability, metallic taste, temporary memory loss or cognitive problems. Physiological compensatory responses (e.g., suppression of the parathyroid hormone levels) may mean the patient does not develop frank hypercalcemia. This condition may be aggravated by high levels of estradiol and prolactin such as in pregnancy, leading to hypercalciuria and/or compensatory hypoparathyroidism.[27] High levels of Vitamin D are also implicated in immune-system dysfunctions which tie into the sarcoid condition.
Prolactin is frequently increased in sarcoidosis, between 3–32% cases have hyperprolactinemia,[28] this frequently leads to amenorrhea, galactorrhea or nonpuerperal mastitis in women. Prolactin also has a broad spectrum of effects on the immune system and increased prolactin levels are associated with disease activity or may exacerbate symptoms in many autoimmune diseases and treatment with prolactin lowering medication has been shown effective in some cases.[29] However it is unknown if this relation holds in sarcoidosis and the gender predilection in sarcoidosis is less pronounced than in some other autoimmune diseases where such relation has been established. In pregnancy, the effects of prolactin and estrogen counteract each other to some degree, with a slight trend to improve pulmonary manifestations of sarcoidosis while lupus, uveitis and arthralgia might slightly worsen.[27] Lupus, uveitis and arthralgia are known to be in some cases associated with increased prolactin levels and respond to bromocriptin treatment but so far this has not been investigated specifically for sarcoidosis. The reasons for increased prolactin levels in sarcoidosis are uncertain. It has been observed that prolactin is produced by T-lymphocytes in some autoimmune disorders in amounts high enough to affect the feedback by the hypothalamic dopaminergic system.[30]
The extrapituitary prolactin is believed to play a role as a cytokine like proinflammatory factor. Prolactin antibodies are believed to play a role in hyperprolactinemia in other autoimmune disorders and high prevalence endocrine autoimmunity has been observed in patients with sarcoidosis.[31] It may also be a consequence of renal disease or treatment with steroids. Neurosarcoidosis may occasionally cause hypopituiarism but has not been reported to cause hyperprolactinemia.
In women, a substantial association of thyroid disease and sarcoidosis has been reported. The association is less marked but still significant for male patients. Female patients have a significantly elevated risk for hypothyroidism, hyperthyroidism and thyroid autoimmunity and it appears that autoimmunity is very important in the pathogenesis of thyroid disease in this population. Thyroid granulomatosis on the other hand is uncommon.[32]
Association of autoimmune disorders has been frequently observed. The exact mechanism of this relation is not known but some evidence supports the hypothesis that this is a consequence of Th1 lymphokine prevalence.[32][33]
Sarcoidosis has been associated with celiac disease. Celiac disease is a condition in which there is a chronic reaction to certain protein chains, commonly referred to as glutens, found in some cereal grains. This reaction causes destruction of the villi in the small intestine, with resulting malabsorption of nutrients.
An association with type IV hypersensitivity has been described.[34] Tests of delayed cutaneous hypersensitivity have been used to measure progression.[35]
While disputed, some cases have been associated with inhalation of the dust from the collapse of the World Trade Center after the September 11, 2001 attacks.[36] See Health effects arising from the September 11, 2001 attacks for more information. Chicago comedian, Bernie Mac, suffered from sarcoidosis and died of pneumonia as a result of his compromised immune system.[37] Reggie White, a former standout National Football League player, also suffered from sarcoidosis, and the disease played a major role in his death.[38]
Granulomatous inflammation is characterized primarily by accumulation of monocytes, macrophages and activated T-lymphocytes, with increased production of key inflammatory mediators, TNF-alpha, IFN-gamma, and IL-12, characteristic of a Th1-polarized response (T-helper lymphocyte-1 response). Sarcoidosis has paradoxical effects on inflammatory processes; it is characterized by increased macrophage and CD4 helper T-cell activation resulting in accelerated inflammation, however, immune response to antigen challenges such as tuberculin is suppressed. This paradoxic state of simultaneous hyper- and hypo- activity is suggestive of a state of anergy. The anergy may also be responsible for the increased risk of infections and cancer. It appears that regulatory T-lymphocytes in the periphery of sarcoid granulomas suppress IL-2 secretion which is hypothesized to cause the state of anergy by preventing antigen-specific memory responses.[39]
While it is widely believed that TNF-alpha plays an important role in the formation of granulomas, it was observed that sarcoidosis can be triggered by treatment with the TNF-alpha antagonist etanercept.[40][41]
Diagnosis of sarcoidosis is often a matter of exclusion. To exclude sarcoidosis in a case presenting with pulmonary symptoms might involve chest X-ray, CT scan of chest, PET scan, CT-guided biopsy, mediastinoscopy, open lung biopsy, bronchoscopy with biopsy, endobronchial ultrasound and endoscopic ultrasound with FNA of mediastinal lymph nodes(EBUS FNA). Tissue from biopsy of lymph nodes is subjected to both flow cytometry to rule out cancer and special stains (acid fast bacilli stain and Gömöri methenamine silver stain) to rule out microorganisms and fungi. Angiotensin-converting enzyme blood levels are used in diagnosis and monitoring of sarcoidosis.[42]
Differential diagnosis includes metastatic disease, lymphoma, septic emboli, rheumatoid nodules, Wegener's granulomatosis, varicella infection, and atypical infections such as mycobacterium avium complex, cytomegalovirus, and cryptococcus.[43] Sarcoidosis is confused most commonly with neoplastic diseases such as lymphoma or with disorders characterized also by a mononuclear cell granulomatous inflammatory process, such as the mycobacterial and fungal disorders.[6]
Because of the wide range of possible manifestations the investigations to confirm diagnosis may involve many organs and methods depending on initial presentation.
Very often, Sarcoidosis presents as a restrictive disease of the lungs, causing a decrease in lung volume and decreased compliance (the ability to stretch) — hence chest X-ray and other methods are used to assess the severity or rule out pulmonary disease.
The disease typically limits the amount of air drawn into the lungs, but produces higher than normal expiratory flow ratios. The vital capacity (full breath in, to full breath out) is decreased, and most of this air can be blown out in the first second. This means the FEV1/FVC ratio is increased from the normal of about 80%, to 90%. Obstructive lung changes, causing a decrease in the amount of air that can be exhaled, may occur when enlarged lymph nodes in the chest compress airways or when internal inflammation or nodules impede airflow.
Chest X-ray changes are divided into four stages
Although patients with type I x-rays tend to have the acute or subacute, reversible form of the disease while those with types II and III often have the chronic, progressive disease, these patterns do not represent consecutive "stages" of sarcoidosis. Thus, except for epidemiologic purposes, this x-ray categorization is mostly of historic interest.[6]
Investigations to assess involvement of other organs frequently involve electrocardiogram, ocular examination by an ophthalmologist, liver function tests, renal function tests, serum calcium and 24-hour urine calcium.
In Sarcoidosis presenting in the Caucasian population, hilar adenopathy and erythema nodosum are the most common initial symptoms. In this population, a biopsy of the gastrocnemius muscle is a useful tool in correctly diagnosing the patient. The presence of a noncaseating epithelioid granuloma in a gastrocnemius specimen is definitive evidence of sarcoidosis as other tuberculoid and fungal diseases extremely rarely present histologically in this muscle[44].
In female patients, sarcoidosis is significantly associated with hypothyroidism, hyperthyroidism and other thyroid diseases, hence close surveillance of thyroid function is recommended [32]
Sarcoidosis may be divided into the following types:[17]:708-11
Between 30 and 70% of patients do not require therapy.[45] For patients presenting with lung symptoms, unless the respiratory impairment is devastating, active pulmonary sarcoidosis is observed usually without therapy for 2 to 3 months; if the inflammation does not subside spontaneously, therapy is instituted.[6] Corticosteroids, most commonly prednisolone, have been the standard treatment for many years. In some patients, this treatment can slow or reverse the course of the disease, but other patients do not respond to steroid therapy. The use of corticosteroids in mild disease is controversial because in many cases the disease remits spontaneously.[46] Additionally, corticosteroids have many recognized dose- and duration-related side effects, and their use is generally limited to severe, progressive, or organ-threatening disease. The influence of corticosteroids or other immunosuppressants on the natural history is unclear.
Severe symptoms are generally treated with steroids, and steroid-sparing agents such as azathioprine and methotrexate are often used. Rarely, cyclophosphamide has also been used. As the granulomas are caused by collections of immune system cells, particularly T cells, there has been some early indications of success using immunosuppressants, interleukin-2 inhibitors or anti-tumor necrosis factor-alpha treatment (such as infliximab). Unfortunately, none of these has provided reliable treatment, and there can be significant side effects such as an increased risk of reactivating latent tuberculosis. Anti-tumor necrosis factor-alpha treatment with etanercept in rheumatoid arthritis has been observed to cause sarcoidosis.[40]
Because sarcoidosis can affect multiple organ systems, follow-up on a patient with sarcoidosis should always include an electrocardiogram, ocular examination by an ophthalmologist, liver function tests, serum calcium and 24-hour urine calcium. In female patients sarcoidosis is significantly associated with hypothyroidism, hyperthyroidism and other thyroid diseases, hence close surveillance of thyroid function is recommended.[32]
The disease can remit spontaneously or become chronic, with exacerbations and remissions. In some patients, it can progress to pulmonary fibrosis and death. Approximately half of the cases resolve without treatment or can be cured within 12–36 months and most within 5 years. Some cases persist several decades.[45] Where the heart is involved, the prognosis is poor.[47] Patients with sarcoidosis appear to be at significantly increased risk for cancer, in particular lung cancer, malignant lymphomas,[48] and cancer in other organs known to be affected in sarcoidosis.[49] In sarcoidosis-lymphoma syndrome, sarcoidosis is followed by the development of a lymphoproliferative disorder such as non-Hodgkin lymphoma.[50] This may be attributed to the underlying immunological abnormalities that occur during the sarcoidosis disease process.[51] Sarcoidosis can also follow cancer [52] or occur concurrently with cancer.[53][54] There have been reports of hairy cell leukemia,[55] acute myeloid leukemia,[56] and acute myeloblastic leukemia [57] associated with sarcoidosis.
Sarcoidosis most commonly affects young adults of both sexes, although studies have reported more cases in females. Incidence is highest for individuals younger than 40 and peaks in the age-group from 20 to 29 years; a second peak is observed for women over 50.[45][47]
Sarcoidosis occurs throughout the world in all races with an average incidence of 16.5/100,000 in men and 19/100,000 in women. The disease is most prevalent in Northern European countries, and the highest annual incidence of 60/100,000 is found in Sweden and Iceland. In the United States, sarcoidosis is more common in people of African descent than Caucasians, with annual incidence reported as 35.5 and 10.9/100,000, respectively.[58] Sarcoidosis is less commonly reported in South America, Spain, India, Canada, and the Philippines.There may be a higher susceptibility to sarcoidosis in those with coeliac disease. An association between the two disorders has been suggested.[59]
The differing incidence across the world may be at least partially attributable to the lack of screening programs in certain regions of the world and the overshadowing presence of other granulomatous diseases, such as tuberculosis, that may interfere with the diagnosis of sarcoidosis where they are prevalent.[47] There may also be differences in the severity of the disease between people of different ethnicities. Several studies suggest that the presentation in people of African origin may be more severe and disseminated than for Caucasians, who are more likely to have asymptomatic disease.[60]
Manifestation appears to be slightly different according to race and sex. Erythema nodosum is far more common in men than in women and in Caucasians than in other races. In Japanese patients, ophthalmologic and cardiac involvement are more common than in other races.[45]
Sarcoidosis is one of the few pulmonary diseases with a higher prevalence in non-smokers.[61]
Sarcoidosis generally does not prevent successful pregnancy and delivery; the endogenous estrogen in pregnancy may even have a slightly beneficial immunomodulatory effect. In most cases the course of sarcoidosis is unaffected by pregnancy; there is improvement in a few cases and worsening of symptoms in very few cases.[27]
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