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Calcinosis cutis

Calcinosis cutis (or cutaneous calcification) is a type of calcinosis wherein calcium deposits form in the skin. A variety of factors can result in this condition. The most common source is dystrophic calcification, which occurs in soft tissue as a response to injury.

Types

The specific manifestation of calcinosis cutis varies according to the original cause of the symptom. Sub-types include:

  • dystrophic calcinosis cutis
  • iatrogenic calcinosis cutis
  • idiopathic calcinosis cutis
  • metastatic calcinosis cutis
  • calcinosis cutis circumscripta
  • calcinosis cutis universalis
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Dermatomyositis
From American Family Physician, 11/1/01 by Ric Anthony Koler

Dermatomyositis is an idiopathic inflammatory myopathy with characteristic skin manifestations. Although the disorder is rare, with a prevalence of one to 10 cases per million in adults and one to 3.2 cases per million in children, early recognition and treatment are important ways to decrease the morbidity of systemic complications. An association with other connective tissue disorders (overlap syndrome) and malignancy make this diagnosis particularly important to primary care physicians. Patient management includes careful evaluation for underlying malignancy and liberal use of physical therapy, antihistamines, sunscreen and oral corticosteroids. Poor prognostic indicators include poorly responsive disease, delay in diagnosis and the presence of malignancy. The therapeutic goal is to maintain function and prevent or minimize sequelae. (Am Fam Physician 2001;64:1565-72.)

Dermatomyositis is an idiopathic disorder that includes an inflammatory myopathy and characteristic skin manifestations; polymyositis includes the inflammatory myopathy without the cutaneous findings. The etiology of dermatomyositis remains unknown; some studies have reported an association with histocompatability antigens, environmental agents (e.g., virus, drugs) and autoimmunity.(1) The average age at diagnosis is 40, and almost twice as many women are affected as men.(2) The average age of onset in juvenile dermatomyositis is between five and 14 years. This subgroup of patients has a better prognosis than adult patients. Modern therapy has reduced mortality from near 50 percent to less than 10 percent.(3)

Diagnostic Criteria

Classification of dermatomyositis and polymyositis was first described in 1975(4,5) and has been only slightly revised to include amyopathic dermatomyositis(6-8) (Table 1).(2) Based on the classification system, diagnostic criteria were developed to further assist in the confidence of the diagnosis (Table 2).(9) The differential diagnosis of dermatomyositis is listed in Table 3.

Manifestations

CUTANEOUS

Cutaneous manifestations of dermatomyositis are generally grouped as pathognomonic, characteristic, compatible, less common and rare (Table 4). The primary lesion appears as a violaceous, macular erythema with a symmetric distribution. This may progress and become poikilodermatous (atrophic with telangiectasia and pigmentary changes) and indurated (as a result of mucin deposition).(3) Pathognomonic manifestations include Gottron's papules and Gottron's sign (Figure 1). Gottron's papules, violaceous papules overlying the dorsal interphalangeal or metacarpophalangeal areas, elbow or knee joints, occur in approximately 70 percent of patients with dermatomyositis.(3) Gottron's sign is erythematous or violaceous, often atrophic, macules or plaques in the same symmetric distribution pattern but sparing the interphalangeal spaces--just the opposite dermatologic distribution pattern on the hand that is observed in patients with systemic lupus erythematosus.

TABLE 4

Cutaneous Manifestations of Dermatomyositis

Pathognomonic manifestations

Gottron's papules: violaceous erythematous papules overlying the dorsal interphalangeal or metacarpophalangeal, elbow or knee joints

Gottron's sign: symmetric, nonscaling, violaceous erythematous macules or plaques, often atrophic, in the same distribution as Gottron's papules

Characteristic manifestations

Shawl sign/V-sign

Heliotrope

Periungual telangiectasias

Mechanic's hand

Compatible manifestations

Poikiloderma atrophicans vasculare

Calcinosis cutis

Less common manifestations

Facial swelling

Malignancy

Erythroderma

Lichen planus

Cutaneous vasculitis

Panniculitis

Rare manifestations

Follicular hyperkeratosis

Papular mucinosis

Hypertrichosis

Malignant erythema

Urticaria/urticarial vasculitis

Partial lipodystrophy

Malignant atrophic papulosis (Degos' disease)

Zebra-like striping

Vulvar/scrotal involvement

Heliotrope, a macular rash with periorbital edema, is considered a characteristic finding of dermatomyositis, as are periungual telangiectasias (Figure 2).(1,8) The rash occurs early in the course of the disease in 30 to 60 percent of patients.(3) The characteristic lesions of the shawl sign and the V-sign appear as erythematous, poikilodermatous macules distributed in a "shawl" pattern over the shoulders, arms and upper back (Figure 3) and in a V-shaped distribution over the anterior neck and chest.(10) Mechanic's hand (Figure 4) and may be associated with an increased risk of interstitial lung disease.(10-12)

Poikiloderma atrophicans vasculare (poikilodermatomyositis), a circumscribed violaceous erythema with associated telangiectasia, hypopigmentation and superficial atrophy, is most commonly found over the posterior shoulders, back, buttocks and a V-shaped area of the anterior neck and chest, and is often a late finding.(10) Calcium deposition (calcinosis cutis) occurs in approximately 30 to 70 percent of cases of juvenile dermatomyositis and in only 10 percent of adult cases.(13-15) The calcinosis is most commonly present on the buttocks, elbows, knees or traumatized areas, and is associated with increased disease activity and duration. Skin findings may be subtle even in patients with severe myositis and are not a measure of the severity of the disease.

SYSTEMIC

Patients with dermatomyositis may also present with many systemic symptoms (Table 5). The most common are proximal muscle weakness, dysphonia or dysphagia. Other possible symptoms include respiratory muscle weakness, visual changes and abdominal pain. An important association with internal malignancy has been demonstrated and will be discussed in further detail.

TABLE 5

Systemic Manifestations and Complications of Dermatomyositis

Systemic manifestations

Common: proximal muscle weakness, dysphonia, dysphagia

Less common: respiratory muscle weakness, visual changes, abdominal pain

Systemic complications/associations

Cardiomyopathy

Cardiac conduction defects

Aspiration pneumonia secondary to respiratory muscle weakness

Diffuse interstitial pneumonitis/fibrosis

Large-bowel infarction secondary to vasculopathy has occurred in juvenile patients with myositis

Muscle atrophy

Muscle calcification

Ocular complications including iritis, nystagmus, cotton-wool spots, optic atrophy, conjunctival edema and pseudopolyposis

Internal malignancy

Subtypes of Dermatomyositis

JUVENILE DERMATOMYOSITIS

While the clinical presentation of juvenile dermatomyositis is usually different from the presentation of the adult type, the skin lesions are similar, with the exception of an increased incidence of calcinosis cutis in juvenile patients. Common findings include low-grade fever, increased risk of gastrointestinal manifestations, and symmetric arthritis of the large and small joints.(16,17) Asymptomatic cardiac conduction delays or right bundle branch block may be found in 50 percent of this group.(18)

Patients may exhibit weakness of the truncal muscles that requires them to use their arms to push themselves up from a prone position (i.e., Gower's sign). There does not appear to be any association between juvenile dermatomyositis and malignancy.(3)

OVERLAP SYNDROME

A number of patients with dermatomyositis also meet the criteria for one of the connective tissue disorders. To be a true overlap syndrome, the patient must meet the diagnostic criteria for each separate disorder. Overlap syndrome occurs more frequently in females than in males, with a 9:1 ratio.(3) Eleven to 40 percent of patients with dermatomyositis have been reported to have a concomitant diagnosis of a connective tissue disorder.(3,19-21)

These disorders include rheumatoid arthritis, scleroderma, systemic lupus erythematosus, Sjogren's syndrome, polyarteritis nodosa and mixed connective tissue disease, and these patients may present with polyarthritis, sicca syndrome, sclerodactyly, Raynaud's phenomenon and late symptoms of myositis. Patients are also more likely to have positive nonmyositis-associated antibodies (such as double-stranded DNA, antinuclear antibodies [ANA], Scl-70, Jo-1 precipitating antibodies, PM-Scl, Ku antibodies or extractable nuclear antigen antibodies). ANA are found in up to 80 percent of patients with dermatomyositis or polymyositis, but this finding does not aid in distinguishing myositis from scleroderma or other rheumatologic diseases.(3,10) Precipitating autoantibodies to the Mi-2 antigen are specific for dermatomyositis but are found in only about 20 percent of patients with dermatomyositis.(2) In patients with overlap syndrome, the myositis tends to respond better to treatment with corticosteroids than it does in patients with an idiopathic etiology.(22)

AMYOPATHIC DERMATOMYOSITIS

This classification has been controversial because it does not strictly meet the criteria put forth by Bohen and Peter.(4,5) Amyopathic patients essentially have pathognomonic skin changes without clinical or laboratory evidence of muscle involvement. This condition has been reported in approximately 2 to 11 percent of patients with dermatomyositis.(7,21,23) Patients most commonly present with lethargy, pruritus, fatigue, photosensitivity or arthralgias.(8) In some cases, myositis developed later; in others, myositis that was not found by standard methods was suspected on the basis of magnetic resonance imaging (MRI).

DERMATOMYOSITIS/MALIGNANCY

Although an increased risk of malignancy has not been associated with juvenile dermatomyositis, it has been demonstrated in adults with dermatomyositis. One study suggested a 6.5-fold increased risk of malignancy.(24) This risk appears to be highest in patients diagnosed with dermatomyositis after 45 years of age. The most commonly reported malignancies are ovarian and gastric cancer, and lymphoma. Other reported malignancies include lung, male genital organ, nonmelanoma skin, Kaposi's sarcoma, mycosis fungoides and melanoma.(25,26)

Skin changes are not different in patients with or without malignancy. Therefore, careful investigation for malignancy should be initiated at the time dermatomyositis is diagnosed. In women with dermatomyositis, there is a significant association with ovarian cancer, and some authors recommend that the work-up for dermatomyositis include a comprehensive gynecologic evaluation, including a cancer antigen (CA-125) baseline screen, mammography and transvaginal ultrasonographic evaluation of the ovaries at baseline, and gynecologic examinations at six- to 12-month intervals for at least two years.(2,27)

Evaluation

A complete history should be obtained and a physical examination performed, including a thorough review of systems, with an emphasis on myositis-related presentations and evidence of skin changes. Recommended tests that should be performed during the initial evaluation are listed in Table 6.(2) Common laboratory manifestations of dermatomyositis are listed in Table 7.

TABLE 6

Evaluation of Dermatomyositis

History and physical examination

Chest radiograph

Serum aldolase, LDH, ALT, AST, CBC with differential, CK, ANA/ENA in appropriate clinical setting, routine serum chemistry

Stool guaiac (three samples)

Urinalysis, urine myoglobin

Muscle biopsy

Skin biopsy[*]

Electromyography

LDH = lactic dehydrogenase; ALT = alanine aminotransferase; AST = aspartate aminotransferase; CBC = complete blood count; CK = creatine kinase; ANA = antinuclear antibody; ENA = extractable nuclear antigens.

[*]--Skin biopsy findings of dermatomyositis are not specific for dermatomyositis but may help exclude other skin conditions that can have clinical appearances similar to the early cutaneous changes of dermatomyositis.2

Treatment

The goal is to improve function and prevent disability. The treatment regimen must be instituted early and requires a team approach between the physical therapist, dermatologist and family physician. Other subspecialist involvement may be required, depending on the particular manifestations of the disease. Before the development of treatment, mortality from complications of dermatomyositis was approximately 50 percent, so patient education is particularly important.(3)

NONPHARMACOLOGIC AND TOPICAL THERAPY

Physical therapy is directed at preventing atrophy and contractures, and is particularly necessary in patients with calcinosis and muscle involvement. Technique should focus initially on passive stretching and splinting, with inclusion of more aggressive strength-building therapy once inflammation is controlled. The use of a broad-spectrum sunscreen is recommended in all patients with dermatomyositis and has the greatest benefit in patients who are photosensitive. Sun-avoidance techniques should be used, including the use of protective clothing. For control of severe pruritus, antihistamines (such as hydroxyzine [Atarax] or doxepin [Sinequan]) are recommended. For further control of the erythematous and pruritic skin changes, a class I (super-high potency) or class II (high potency) topical corticosteroid is recommended.(3,10)

SYSTEMIC PHARMACOLOGIC THERAPY

Table 8(3,10) lists treatment modalities. Prednisone remains the initial oral pharmacologic agent, given in a single daily dose of 0.5 to 1.5 mg per kg until the serum creatine kinase (CK) level is normalized and then slowly tapered over the following 12 months. An alternate regimen is 40 to 60 mg of prednisone per day (1 to 2 mg per kg in children) in divided doses until the CK level has normalized, at which point the drug can be consolidated to a single daily dose. If the CK level remains within normal limits, that dose may be reduced by one fourth every three to four weeks. Prednisone should continue to be tapered until a maintenance dosage of 5 to 10 mg per day is reached. This low dosage should be continued for one year. If the CK level increases, a higher dosage of prednisone is warranted. If no improvement in objective muscle strength occurs after three months of prednisone therapy, other immunosuppressive therapy should be considered. The latter will be necessary in approximately 25 percent of patients.(3,10)

It is important to be aware of steroid myopathy, which may mimic a worsening dermatomyositis. Differentiating steroid myopathy from worsening dermatomyositis is based on evaluation of neck flexor strength--neck flexor strength would be unchanged if steroid myopathy were developing.(3,10)

Methotrexate (Rheumatrex) is considered the first-line adjuvant therapy in patients who do not respond to prednisone. Oral therapy should be initiated at a dosage of 7.5 to 10 mg per week and increased by 2.5-mg increments until a goal of 25 mg per week is reached. In children, a dosage of 1 mg per kg has been used. As the methotrexate dosage increases, the dosage of steroid should be decreased. Alternate intravenous dosing initiated at 10 mg per week should be increased by 2.5 mg per week until a total dosage of 0.5 to 0.8 mg per kg is reached. It is important to also give 1 to 3 mg per day of folic acid to minimize the side effects of methotrexate. Adverse effects include stomatitis, hepatic fibrosis, cirrhosis, nausea, abdominal pain, neutropenia, pruritus, fever, pneumonitis and other gastrointestinal symptoms. A liver biopsy should be considered before treatment is initiated. Methotrexate should be used only by physicians who are familiar with the drug's actions and side effects.(3,10)

Serum immunoglobulin has been used with success for treatment of patients with refractory dermatomyositis.(28) Because of the limited duration of improvement and its high cost, this agent has not become a primary therapy.

Prognosis

Poor prognostic indicators include recalcitrant disease, delay in diagnosis, older age, malignancy, fever, asthenia-anorexia, pulmonary interstitial fibrosis, dysphagia and leukocytosis. Malignancy, cardiac and pulmonary dysfunction, and infection are the most common causes of death. With early treatment, survival rates as high as 80 and 73 percent at five and eight years, respectively, have been reported.(29) Poor prognostic indicators in juvenile dermatomyositis are late onset of treatment, initial treatment with a dosage of prednisone that is too low, recalcitrant disease and pharyngeal involvement. Up to two thirds of this patient population develop severe complications of calcinosis cutis(13,30) with mortality rates between 3 and 10 percent.(10,18)

Figures 1 through 4 from Kurt Maggio, M.D., and the Walter Reed Army Medical Center Department of Dermatology, Washington, D.C.

The opinions and assertions contained herein are the private views of the authors and are not to be construed as official or as reflecting the views of the Army Medical Department or the Department of Defense.

The authors indicate that they do not have any conflicts of interest. Sources of funding: none reported.

REFERENCES

(1.) Callen JP. Dermatomyositis. In: Callen JP, ed. Dermatological signs of internal disease. 2d ed. Saunders, 1995:13-20.

(2.) Drake LA, Dinehart SM, Farmer ER, Goltz RW, Graham GF, Hordinsky MK, et al. Guidelines of care for dermatomyositis. American Academy of Dermatology. J Am Acad Dermatol 1996;34(5 pt 1):824-9.

(3.) Kovacs SO, Kovacs SC. Dermatomyositis. J Am Acad Dermatol 1998;39:899-920.

(4.) Bohan A, Peter JB. Polymyositis and dermatomyositis. Pt I. N Engl J Med 1975;292:344-7.

(5.) Bohan A, Peter JB. Polymyositis and dermatomyositis. Pt II. N Engl J Med 1975;292:403-7.

(6.) Dalakas MC. Polymyositis, dermatomyositis and inclusion-body myositis. N Engl J Med 1991;325: 1487-98.

(7.) Euwer RL, Sontheimer RD. Amyopathic dermatomyositis (dermatomyositis sine myositis). J Am Acad Dermatol 1991;24:959-66.

(8.) Euwer RL, Sontheimer RD. Dermatologic aspects of myositis. Curr Opin Rheumatol 1994;6:583-9.

(9.) Tanimoto K, Nakano K, Kano S, Mori S, Ueki H, Nishitani H, et al. Classification criteria for polymyositis and dermatomyositis. J Rheumatol 1995;22:4.

(10.) Sontheimer RD. Dermatomyositis. In: Freedberg IM, Eisen AZ, Wolff K, et al., eds. Fitzpatrick's Dermatology in general medicine. 5th ed. New York: McGraw-Hill, 1999:2009-20.

(11.) Stahl NI, Klippel JH, Decker JL. A cutaneous lesion associated with myositis. Ann Intern Med 1979; 91:577-9.

(12.) Mitra D, Lovell CL, Macleod TI, Tan RS, Maddison PJ. Clinical and histological features of "mechanics hands" in a patient with antibodies to Jo-1: a case report. Clin Exp Dermatol 1994;19:146-8.

(13.) Bowyer SL, Blane CE, Sullivan DB, Cassidy JT. Childhood dermatomyositis. J Pediatr 1983;103:882-8.

(14.) Orlow SJ, Watsky KL, Bolognia JL. Skin and bones II. J Am Acad Dermatol 1991;25:447-62.

(15.) Halbert AR. Juvenile dermatomyositis. Aust J Dermatol 1996;37:106-8.

(16.) Sullivan DB, Cassidy JT, Petty RE. Dermatomyositis in the pediatric patient. Arthritis Rheum 1977;20 (suppl 2):327-31.

(17.) Pachman LM. Juvenile dermatomyositis. Pediatr Clin North Am 1995;42:1071-98.

(18.) Pachman LM. Polymyositis and dermatomyositis in children. In: Maddison PF, Isenberg DA, Woo P, et al, eds. Oxford textbook of rheumatology. Oxford, England: Oxford University Press,1993:821-8.

(19.) Tymms DE, Webb J. Dermatomyositis and other connective tissue disease: a review of 105 cases. J Rheumatol 1985;12:1140-8.

(20.) Turner ML. Connective tissue diseases. Clin Plast Surg 1993;20:77-90.

(21.) Bohan A, Peter JB, Bowman RL, Pearson CM. Computer-assisted analysis of 153 patients with polymyositis and dermatomyositis. Medicine 1977;56:255-86.

(22.) Joffe MM, Love LA, Leff RL, Fraser DD, Targoff IN, Hicks JE, et al. Drug therapy of the idiopathic inflammatory myopathies. Am J Med 1993; 94:379-87.

(23.) Cox NH, Lawrence CM, Langtry JA, Ive FA. Dermatomyositis. Arch Dermatol 1990;126:61-5.

(24.) Airio A, Pukkala E, Isomaki H. Elevated cancer incidence in patients with dermatomyositis: a population based study. J Rheumatol 1995;22:1300-3.

(25.) Sigurgeirsson B, Lindelof B, Edhag O, Allander E. Risk of cancer in patients with dermatomyositis or polymyositis. N Engl J Med 1992;326:363-7.

(26.) Callen JP. Dermatomyositis and malignancy. Clin Dermatol 1993;11:61-5.

(27.) Whitmore SE, Rosenshein NB, Provost TT. Ovarian cancer in patients with dermatomyositis. Medicine1994;73:153-60.

(28.) Dalakas MC, Illa I, Dambrosia JM, Soueidan SA, Stein DP, Otero C, et al. A controlled trial of high-dose intravenous immune globulin infusions as treatment for dermatomyositis. N Engl J Med 1993;329:1993-2000.

(29.) Hochberg MC, Feldman D, Stevens MB. Adult onset polymyositis/dermatomyositis. Semin Arthritis Rheum 1986;15:168-78.

(30.) Taieb A, Guichard C, Salamon R, Maleville J. Prognosis in juvenile dermatopolymyositis. Pediatr Dermatol 1985;2:275-81.

RIC ANTHONY KOLER, MAJ, MC, USA, is currently a staff family physician at Fox Army Health Center, Redstone Arsenal, Ala. Dr. Koler received his medical degree from Michigan State University College of Osteopathic Medicine, East Lansing, and completed a residency in family medicine at Martin Army Community Hospital, Ft. Benning, Ga.

ANDREW MONTEMARANO, MAJ, MC, USA, is an associate professor of dermatology for the Uniformed Services University of the Health Sciences in Bethesda, Md., and full-time instructor in the Department of Dermatology at Walter Reed Army Medical Center, Washington, D.C. Dr. Montemarano received his medical degree from Philadelphia (Pa.) College of Osteopathic Medicine and completed a residency in dermatology at Walter Reed Army Medical Center.

Address correspondence to Maj. Ric A. Koler, Fox Army Health Center, Redstone Arsenal, AL 35809 (e-mail: rkoler@knology.net). Reprints are not available from the authors.

COPYRIGHT 2001 American Academy of Family Physicians
COPYRIGHT 2001 Gale Group

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