Author: Dr Delwyn Dyall-Smith FACD, Dermatologist, Australia, 2011.
Waldenström macroglobulinaemia is a low-grade form of lymphoma in which cancerous B-cells in the bone marrow, lymph nodes and/or spleen produce excessive quantities of IgM antibodies (lymphoplasmacytic lymphoma). These antibodies, called paraproteins, are all identical and are detected in the blood circulation. Skin problems are uncommon in this condition but, when present, may be helpful in considering the diagnosis.
Waldenström macroglobulinaemia affects males a little more commonly than females, and usually in the age range 50-70 years (median age 63 years).
The most common presenting symptoms are:
Common signs are:
The cause of Waldenström macroglobulinaemia is unknown.
The skin is affected in Waldenström macroglobulinaema in approximately 5% of patients and occurs in three general ways:
The most common of these is when there is so much paraprotein in the blood that it affects blood flow (hyperviscosity syndrome) and this can present as:
Sometimes the paraprotein is affected by cold (cryoglobulin) and can then cause:
If the paraprotein is deposited in the skin it can result in numerous ‘storage papules’ which are small skin-coloured or translucent bumps on the body, buttocks or outer (extensor) aspects of the limbs. These are usually not itchy.
When the paraprotein attacks the skin, it can cause blisters, hives or itchy bumps.
Specific infiltrates: In this rare skin presentation the cancerous B-cells form lumps in the skin that can range in size from small papules to large plaques. They have been described as red-brown to purple in colour, are usually not itchy and appear on the trunk, earlobes, face or legs. Symmetrical firm swelling and burning of the face, with a purple colour is considered characteristic. This usually develops several years after the diagnosis of Waldenström macroglobulinaemia has been made, but can be the presenting problem.
There have also been a number of other skin presentations reported in association with Waldenström macroglobulinaemia including:
In general, the presence of skin lesions of any type does not appear to affect outcome in this condition which often does not require treatment.
Waldenström macroglobulinaemia is diagnosed by:
Skin biopsy may be helpful in some situations:
Further investigations may be performed to assess the extent of the disease and presence of complications.
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