Case report
Scleromyxedema: a rare disorder and its treatment difficulties

Introduction

Scleromyxedema (SM) is a rare progressive cutaneous mucinosis usually associated with a systemic involvement and paraproteinemia. It was first defined by Arndt and Gottron (1954) [1], then redefined by Rongioletti and Rebora (2001), as a disease characterised by a generalised papular and sclerodermoid eruption, monoclonal gammopathy (mostly Ig-l paraproteinemia) and a triad of histological features: presence of mucin deposition within the upper and mid reticular dermis, fibroblast proliferation and fibrosis with the absence of a thyroid disorder [2] (Figure 1).

Scleromyxedema is a severe disorder that may be fatal. It is characterised by an excessive deposition of mucin in the connective tissue [3]. The deposits may stimulate the synthesis of collagen and glycosaminoglycans [1]. As a result, lichenoid papules are formed which cause thickening and hardening of the tissue [4]. Scleromyxedema has a chronic, disabling course because it is often associated with a systemic involvement of internal organs. Scleromyxedema is thought to have three main clinicopathological subsets: local, generalised and atypical [3]. The generalised form is often referred to as the “generalised lichen myxedematosus”, and its course is much more severe than that of the other forms (Figure 2).

The prevalence of SM is equal in men and women. No standard treatment exists as the rarity of the disease has prevented the execution of controlled therapeutic trials. Until 2009, only 150 cases of patients suffering from scleromyxoedema were reported [5].

The skin appears to be elephant-like and forms linear folds. The papules tend to group in the neck and forehead area. Histopathological examination reveals numerous mucin deposits in papules and sclerotic malformations, which consist of thickened collagen fibres. The mucin deposits are subtle in these lesions [1].

Numerous internal manifestations may occur in SM [6-8] (Table 1).

Case report

We report a case of a 38-year-old man with a 1.5-year history of scleromyxedema typically associated with light chain l IgG monoclonal gammopathy. He was first hospitalized in February 2011 due to severe pruritus of his feet and shanks, elbow, and carpal joint pain and sclerodactyly. Simultaneously erythema and small papules appeared on the skin of his face.

Cutaneous examination revealed small, symmetric, disseminated papules (of 1 mm in diameter). Waxy and firm papules were localised mainly on both arms. The patient also presented excessive and diffuse thickening of the skin on the face, especially surrounding the lips, which later led to facial expression impairment.

Radiological and ultrasonographic examinations were also performed to exclude any systemic involvement of the disease (chest X-ray, USG of abdomen). In laboratory investigation complete blood count was normal. Serum analysis indicated hyperproteinemia: IgG monoclonal gammopathy with l light chains were present. Bence-Jones protein was detected, however, further investigations excluded haematological disorders. Urine analysis was normal. Based on clinical manifestations, and histopathological and laboratory data, the diagnosis of scleromyxoedema with associated IgG-l was obtained.

As scleromyxedema leads to systemic involvement, the patient was consulted by several specialists: a haematologist, cardiologist, neurologist, ophthalmologist, internal medicine doctor and several dermatologists. The haematologist disqualified the patient from treatment with melphalan. Therapy before hospitalisation included oral prednisolone, oral antihistaminic drugs and topical steroids but remained ineffective. Treatment was started with hydrocortisone i.v. 2 × 200 mg/3 consecutive days, afterwards 1 × 200 mg/6 days, which resulted in a slight improvement – erythema started to fade. After a relapse of the disease several weeks later, we introduced a combination of oral acitretin 75 mg daily and methylprednisolone: 2 doses in an alternating manner 48 mg or 32 mg daily were administered. This stopped the progression of the disease. However, as a result of steroid and retinoid administration, the patient presented hypercholesterolemia, hypertriglyceridaemia and mere hyperglycaemia. This is why the doses were lowered to: acitretin 50 mg daily, methylprednisolone 16/8 mg and later 16/24 mg, but this led to another relapse of clinical symptoms. Then, plasmapheresis was started. The patient received a total of 4 cycles of plasmapheresis. Each cycle consisted of 4-5 procedures of plasmapheresis. Every course resulted in short-term clinical improvement – cutaneous manifestation each time became less severe. In order to attempt to achieve remission, IVIG treatment was started (Figures 3 and 4).

Discussion

Causal treatment of scleromyxedema is unavailable, as the aetiology is still unclear [9]. The severe course of the disease requires very aggressive treatment and long- term maintenance therapy is necessary in most cases [7].

According to the literature, a successful therapy with relatively long-term effects and few side effects involves the use of IVIG [28, 29]. It is considered to be the best therapeutic option as it is associated with relatively few side effects [27]. Plasmapheresis remains effective only in a short-time perspective and leads to relapses. For this reason we started IVIG treatment. We received a relatively good and longer lasting response to this treatment modality: the papules and generalised sclerodermoid eruption became less visible. The progression of the disease was stopped. However, from a financial aspect, this treatment modality may be challenging.

The chronic course of this disease affects the patient mentally, thus psychological or psychiatric therapy may also be introduced in order to improve the results of systemic treatment.

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