Scleromyxoedema L98.5

Arndt & Gottron, 1954

Rare, severe, generalized variant of lichen myxoedematosus with characteristic skin-colored, lichenoid papules, extensive thickening and hardening of the skin with storage of mucins and massively increased fibrosis of the dermis.

Frequent (>90%) monoclonal paraproteinemia (MGUS), mostly of the IgG1-Lambda type, less frequently of the IgG-Kappa type (see also mucinoses). IgG1-Lambda is a 7S, papain-sensitive globulin (size approx. 100 kDa), which is strongly basic due to its high lysine content.

Unknown.

Pathogenetically, it seems to be largely certain today that fibroblasts are responsible for the production and accumulation of acid mucopolysaccharides. Fibroblasts are stimulated by a serum factor that is independent of the paraprotein.

The position of paraproteinemia in the course of the pathogenesis of the disease is unclear. Stimulation of fibroblasts also occurs after elimination of paraproteinemia.

The paraprotein level does not correlate with the severity of the disease!

No gender relation, first manifestation 40th-60th LJ

Face, typical infestation of the glabella, neck, arms, hands, trunk,

Scleroderma-like picture: Diffusely thickened facial skin with mimic rigidity, thickened skin of distal parts of extremities.

Thickened, doughy consistency-multiplied, hyperpigmented, "too wide" skin that lifts off in large bulging folds (see Fig.).

Multiple, densely spaced, firm, pinhead-sized, often pruritic, lichenoid papules arranged in the skin lines, especially on the forehead (glabella), lateral facial region, retroauricularly, and neck. Less common is symmetrical involvement of the extremities as well as the back and abdomen. The palms may also be characterized "scleroderma-like" by waxy induration.

Internal organs: Sclerosis of renal and coronary arteries with corresponding symptoms, cerebral symptoms, pulmonary involvement (pulmonary fibrosis after years of progression); arthritides, peripheral polyneuropathies, esophageal motility disorders.

Complication: Dermato-neuro syndrome as a rare, acute neurologically accentuated symptomatology with fever, flu-like symptoms, epileptic seizures, confusion with hallucinations and possible fatality.

in > 90% of the patients a monoclonal gammopathy is found: IgG lambda type, rarely IgG-kappa-, IgA- or IgM-paraproteins; also detection of a reactive plasmocytosis (approx. 10% plasma cells in the bone marrow)

Massive deposits of mucoid substances in the dermis. Cell-rich fibrosis with fibroblast proliferation, degenerated connective tissue fibres, swollen collagen fibres and vascular walls.

• Scleroderma, systemic: Skin sclerosis, usually onset with involvement of upper extremities(acrosclerosis), Raynaud's symptoms, possibly dome necrosis, characteristic facial symptoms, occurrence of ANA and highly specific ENA, characteristic organ involvement.
• Scleroderma, disseminated circumskripte: Mostly painless, chronic stationary, localized to trunk and extremities, large white, red, or brown indurations. No papulosis. No organ involvement. Histology is demarcatingly demonstrative. Usually no serologic autoimmune phenomena.
• Fibrosis, nephrogenic systemic (rare): Plaque-like and/or diffuse, board-hard (woody) thickening and induration of the skin, subcutis, and underlying musculature with brownish, yellowish discoloration. No papulosis. Onset of skin lesions on extremities, then spread to trunk. Face usually left out. Burning pain, itching. Patients are severely ill!
• Scleroedema adultorum: Principle: "athlete's back"! Massive back - and neck contour (bull neck) with firm consistency, either not noticed by the pat. at all, or rather accidental. No papulosis. No discoloration of the skin. Diabetes and obesity.
• Fasciitis, eosinophilic: V.a. on forearms; rarely on trunk and face. Doughy, painful, red swelling with subsequent dermal induration of skin and subcutaneous fat. This causes pseudo cheek skin phenomenon. Frequent development of joint contractures and carpal tunnel syndrome. Occasional accompanying arthralgias, myositis, paresthesias of the fingers. No involvement of internal organs, no Raynaud's phenomenon. Blood eosinophilia, CRP elevation, and hypergammaglobulinemia.
• Myxedema, pretibial: Pretibial, coarse, difficult to depress induration; peau d'orange, hypertrichosis, always hyperthyroidism.
• Mucinoses of other genesis (see mucinosis(s) below).

No causal therapy known. Therapy of skin lesions was successful in individual cases with the following therapy modalities:

• For purely cutaneous, limited pattern of involvement:
  • Retinoids: Isotretinoin (e.g. Isotretinoin-ratiopharm; Aknenormin) initially 0.5 mg/kg bw/day, maintenance therapy according to clinic.
  • Irradiation: Alternatively initiation of PUVA therapy or RePUVA therapy.
• In case of extensive infestation pattern u./o. evidence of gammopathy u./o. systemic infestation:
  • IVIG. Worldwide, most patients have now been treated with IVIG with remarkably good results (2 times complete healing), especially in the Anglo-American region. The dosages were in the high therapy range (2 g/kg bw! distributed over several days); therapy intervals of 4 weeks. Therapy duration 6 months up to 3 years (Haber R et al. (2020) .

    Notice. Probably the most promising therapy principle (optimal dosages still unclear) with unfortunately very high therapy costs!

  • Glucocorticoids in combination with cytostatics: prednisone (e.g. Decortin) 80-100 mg/day combined with cyclophosphamide (e.g. Endoxan) 150-200 mg/day p.o., gradual dose reduction. Aim for maintenance therapy around 50 mg/day. Alternative shock therapy: prednisone 500-1000 mg i.v. every 2-4 weeks, then extend intervals. Alternative: combination with dexamethasone 40 mg p.o. for 4 days every 4 weeks.
  • Alternative: Plasmapheresis in combination with immunosuppressants such as cyclophosphamide: This is a therapeutic principle for which good long-term success has been described. Early initiation of therapy improves success.
  • Alternative: Melphalan (Alkeran): Relatively good response with relatively high rate of side effects. Maintenance therapy at 1-10 mg/day p.o.
  • Alternative: IVIG+Thalidomide. In individual cases, successful monotherapeutic, or with IVIG-combined, use of thalidomide 100 mg/day p.o. has been described (Haber R et al. 2020) . Monotherapy for 2 years, improvement is expected after about 6 months.
  • Alternative: photopheresis, extracorporeal: trial with extracorporeal photopheresis has been described with success in individual cases of therapy resistance.
  • Radiotherapy with fast electrons (for cutaneous foci, dose: 7 MeV electrons, several sessions up to a GD of 16-28.5 Gy).
  • Alternative: chloroquine/ hydroxychloroquine (Resochin, Quensyl): Successful in casuistry for a short time, especially in joint immobility d. extremities. Initially 600 mg/day p.o. for 10 days, then 400 mg/day p.o. for 4 weeks; then 200 mg/day p.o. Success of therapy can be assessed after 6 months at the earliest.
  • Algernative: bone marrow transplantation: Patients with severe or refractory disease have been treated with autologous bone marrow transplantation (Haber R et al. 2020),

• The 55-year-old patient first noticed diffuse swelling and a feeling of tension in the face and on the extensor sides of the upper extremities about 10 years ago. Over the years, there had been a gradual hardening of the entire skin with movement restrictions, initially in the hands and later progressively in the elbows and shoulder joints. The diagnosis of scleromyxedema was made in 2003.
• The following therapies were used in the order listed: hydroxychloroquine for 1.5 years (dosage: initially 400 mg/day for 4-8 weeks, then 200 mg/day). No palpable effect. Isotretinoin 8 months (dosage: 20 mg/day). Discontinuation due to progression. Intermittent UVA-1 cold light therapy (see phototherapy below) (dosage: 2520 J/cm2). Therapy success was noticeable but not satisfactory.
• Findings: In the clearly obese patient a continuous diffuse, coarse (almost woody) hardening of the homogeneously brownish tinged integument was detectable, which could only be dented by firm permanent pressure. There were flexion contractures of several joint systems (hands, shoulders). Dense, firm, shiny, skin-colored papules and plaques were demonstrable retroauricularly and in the frontal area. Marked microstomia (scleroderma-like facial aspect).
• Laboratory: monoclonal gammopathy type-IgG lambda. Mild lymphocytosis, ESR 35/70; CRP markedly elevated.
• Therapy: 4-week repetitive IVIG (1 g/kg bw distributed over 3 days); duration of therapy: 2 years (possibly longer).
• Results: Significant decrease in skin induration, which was detectable both subjectively and objectively (20 MHz sonography and histology).

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2. Charles S et al (2014) Dermato-neuro syndrome during scleromyxedema: efficacy of plasmapheresis and intravenous immunoglobulin. Ann Dermatol Venereol 141:523-527
3. Dubreuilh W (1908) Fibromes miliares folliculaires: sclérodermie consécutive. Arch Derm Syph 91: 569-572
4. Durani BK (2001) Extracorporeal photophoresis - therapeutic option for scleromyxedema. Dermatologist 52: 938-941
5. Gerstner S et al (2014) Differential diagnosis of angioedema. Acute edematous scleromyxedema]. Dermatologist 65:454-457
6. Gottron HA (1954) Scleromyxedema (A peculiar manifestation of myxothesauroderma). Arch Derm Syph 199: 71-91
7. Haber R et al (2020) Scleromyxedema treatment: a systematic review and update. Int J Dermatol 59:1191-1201.
8. Kövary PM et al (1980) Scleromyxedema Arndt-Gottron - a paraproteinemic dermatosis. Act Dermatol 6: 155-163
9. Sansbury JC et al (2004) Treatment of recalcitrant scleromyxedema with thalidomide in 3 patients. J Am Acad Dermatol 51: 126-131
10. Topf S et al (2007) Marked improvement of Arndt-Gottron scleromyxedema by high-dose intravenous immunoglobulins. Dermatologist 58: 525-528
11. Wetter DA et al (2005) Effectiveness of intravenous immunoglobulin therapy for skin disease other than toxic epidermal necrolysis: a retrospective review of Mayo Clinic experience. Mayo Clin Proc 80: 41-47