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Acrodermatitis Chronica Atrophicans: Differential Diagnoses & Workup
Updated: Mar 23, 2009
- Overview
- Differential Diagnoses & Workup
- Treatment & Medication
- Follow-up
- Multimedia
Differential Diagnoses
| Endemic Syphilis | Pernio |
| Eosinophilic Fasciitis | Syphilis |
| Erysipelas | Systemic Sclerosis |
| Erysipeloid | Venous Insufficiency |
| Lichen Sclerosus et Atrophicus | |
| Morphea |
Workup
Laboratory Studies
- Genetic profiles of strains of B burgdorferi sensu lato derived from patients with acrodermatitis chronica atrophicans often show the highly conserved MLa1 pattern characteristic of B afzelii; however, they may demonstrate the large restriction fragment patterns typical of B garinii.
- Physicians should diagnose acrodermatitis chronica atrophicans based on careful evaluation of the history, including epidemiologic data, signs, and symptoms of early and late infection; on a detailed physical examination; and on the specific serologic tests results and histopathologic picture of skin biopsy specimens. A negative history of exposure to ticks should not exclude the diagnosis. B afzelii can be identified in skin lesions by polymerase chain reaction (PCR), but both cultures and direct spirochetal stains are usually negative.
- Laboratory evidence of infection by demonstration of specific antibodies with a 2-test approach involving initial screening with enzyme-linked immunosorbent assay (ELISA) or indirect immunofluorescence assay (IFA) and subsequent confirmation of positive and equivocal results with Western blot is essential for diagnosis of Lyme borreliosis. All patients with acrodermatitis chronica atrophicans are seropositive for immunoglobulin G (IgG), some of them also for immunoglobulin M (IgM) antiborrelial antibodies.
- False-positive results of IFA or ELISA can occur because of cross-reactivity with Treponema pallidum, saprophytic Treponema and other spirochetal agents (ie, Leptospira species), and rheumatoid factor. False-positive results may also occur in patients with infectious mononucleosis and other disorders with activated B cells.
- In the regions in which a high incidence of syphilis exists (ie, Eastern Europe, Central Asia), in every case of B burgdorferi seropositivity, T pallidum infection should be excluded using the Treponema pallidum hemagglutination assay (TPHA). Infection of B burgdorferi should also be ruled out in cases of false-positive serologic tests results for syphilis.
- ELISA with sonicated or purified or recombinant antigens of B burgdorferi seems to be more specific than IFA using cultured borreliae and serum preexposed to nonpathogenic Treponema phagedenis.
- Immunoblotting with various B burgdorferi antigens is used as a confirmatory test in Lyme borreliosis.
- In the authors' opinion, the strategy of the serologic diagnosis of acrodermatitis chronica atrophicans (as in the cases of late syphilis) should include the assessment of quantitative serologic test results (ie, IFA) because a high titer of antibodies, even in persons without clinical signs and symptoms of neuroborreliosis, may point to CNS involvement and to the need for cerebrospinal fluid examination for intrathecal production of antiborrelial antibodies.
- Because acrodermatitis chronica atrophicans is often confused with vascular conditions, serologic proof of the diagnosis and histologic verification are considered obligatory8 PCR for Borrelia -specific DNA (rather than culture of the spirochete) is sometimes a necessary adjunct for the diagnosis.
Imaging Studies
- Radiologic findings in patients with acrodermatitis chronica atrophicans may show subluxation of the toe joint and periostitis of the bones of the lower limb.
Other Tests
- Sural nerve biopsy may demonstrate a mainly axonal neuropathy.
- Cerebrospinal fluid testing shows mononuclear pleocytosis and intrathecal production of specific antibodies when the CNS is involved.
Histologic Findings
The most important histologic findings in acrodermatitis chronica atrophicans are the presence of telangiectasias and cellular infiltrates of lymphocytes with admixed plasma cells in the absence of any other explanation for the plasma cells (eg, syphilis, myeloma). Though not diagnostic, these changes are highly suggestive.
Acrodermatitis chronica atrophicans in its early inflammatory edematous stage shows a dense, patchy perivascular and periappendiceal dermal infiltrate of lymphocytes, histiocytes, and plasma cells. Collagen bundles become swollen and homogeneous and are split by mucinous deposition.
The atrophic stage of acrodermatitis chronica atrophicans demonstrates striking epidermal atrophy, a normal zone just below the epidermis, dilated blood vessels, and a lymphocytic–plasma cell infiltrate within the upper dermis. Plasma cell–rich infiltrates within a sclerotic dermis should suggest the possibility of acrodermatitis chronica atrophicans. Neural lymphocytic infiltration may be evident. Leukocytoclastic vasculitis or vessel occlusion may be seen in some cases. The subcutis is involved in a large percentage of patients.
Warthin-Starry stains may show spirochetes in some cutaneous biopsy specimens, though this is often not the case.
Immunohistochemical studies show few B cells despite a substantial number of plasma cells.
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Differential Diagnoses & Workup: Acrodermatitis Chronica Atrophicans |
| Treatment & Medication: Acrodermatitis Chronica Atrophicans |
| Follow-up: Acrodermatitis Chronica Atrophicans |
| Multimedia: Acrodermatitis Chronica Atrophicans |
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Further Reading
Keywords
acrodermatitis chronica atrophicans, Herxheimer disease, ACA, European Lyme borreliosis, LB, Lyme disease, borreliosis, Borrelia afzelii, B afzelii, Borrelia garinii, B garinii, Borrelia burgdorferi, B burgdorferi, Ixodes ricinus, I ricinus, Ixodes hexagonus, I hexagonus, Ixodes persulcatus, I persulcatus, Ixodes scapularis, I scapularis, Ixodes pacificus, I pacificus, cutaneous atrophy, erythema migrans, EM, tick bite, tick vector
Differential Diagnoses & Workup: Acrodermatitis Chronica Atrophicans