Israel Medical Association Journal

Scleromyxedema is a rare, chronic cutaneous mucinosis characterized clinically by diffuse indurated plaques, numerous waxy papules, and potential for systemic involvement, including neurological, pulmonary, and gastrointestinal complications. It can significantly impact the clinical course and patient prognosis [1].

Histologically, scleromyxedema typically manifests in two main forms. The classic form, the most common variant, is characterized by dense mucin deposition within the dermis, an increase in fibroblasts, and thickened collagen. The granuloma annulare-like variant, accounting for approximately 23% of cases, mimics granuloma annulare and is characterized by interstitial granulomatous infiltration and, in some cases, palisaded granulomas within the dermis. This unusual variant presents a significant diagnostic challenge due to its overlap with other granulomatous conditions, potentially causing diagnostic delays [2].

The lack of standardized treatment regimens makes managing scleromyxedema complex. Intravenous immunoglobulin (IVIG) has emerged as a leading therapeutic option, demonstrating efficacy in controlling both cutaneous and systemic manifestations. Other options include systemic steroids, thalidomide, retinoids, and melphalan [3].

These cases underscore the challenges of recognizing the clinical and histologic variability of scleromyxedema, which may lead to a delay in the diagnosis. Early diagnosis is critical given the potential for systemic involvement (neurological, gastrointestinal, and muscular) and the association of scleromyxedema with monoclonal gammopathy of undetermined significance (MGUS), which might progress to multiple myeloma. Consequently, timely hematologic evaluation and ongoing surveillance are warranted.

Objectives: To study the necessity of bone marrow examination for the diagnosis and clinical course of MGUS[1].

Methods: We retrospectively screened the medical records of all patients in whom monoclonal protein was found in the serum during 2001–2002 in the medical laboratories of Sapir Medical Center. Asymptomatic patients who had serum monoclonal immunoglobulin G < 3.0 g/dl or IgA[2] < 2.0 g/dl or IgM < 1.0 g/dl without anemia, renal failure, hypercalcemia or any bone lesions on skeletal survey were eligible. Full records of patients who were evaluated in the hematology clinic were available (group 1). The remaining patients were followed by their family physicians; thus we had access only to their electronic files including laboratory results and new diagnoses (group 2). Demographic and clinical parameters as well as clinical course were evaluated.

Results: Both groups (57 and 255 patients, respectively) had similar demographic, laboratory and clinical characteristics. Bone marrow examination was performed in 30 of 57 patients (group 1): 16 were normal, 8 had an excess of normal plasma cells, and 6 had excess of pathologic plasma cells. However, only in two of the latter six could a diagnosis of multiple myeloma be established. All group 1 patients were followed for 22 ± 11 months and only two developed overt multiple myeloma. During the same period, 6 of 255 patients (group 2) were diagnosed as multiple myeloma and 3 as MGUS in other hospitals. The rest had a stable course with no change in their laboratory values.

Conclusions: Our findings suggest that bone marrow examination should not be performed routinely in patients who fulfill strict clinical and laboratory criteria of MGUS.