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Author: Dr Marius Rademaker, Dermatologist, Hamilton, New Zealand, 2008. Update by Dr Amanda Oakley, Dermatologist, Hamilton, New Zealand. December 2017.
Glomuvenous malformation is an unusual form of venous malformation, typically diagnosed at birth or later in infancy or childhood. Glomuvenous malformation is also known as glomangioma or glomangiomatosis.
Who gets glomovenous malformation?
Although glomovenous malformation may be sporadic, glomovenous malformation may be familial with an autosomal dominant pattern of inheritance (this is where half the children of an affected parent inherit the condition). An abnormal chromosome 1p21–p22 has been identified in these families. It results in inactivation of a protein called glomulin.
Glomuvenous malformation presents as a localised or segmental collection of soft, pink, red or blue nodules or coalescing plaques. They may arise anywhere on the skin and may rarely affect mucous membranes. These vascular lesions are less compressible than other forms of venous malformation.
Lesions tend to get more widespread, thicker, and deeper in colour with age. Although the nodules start off painless, they may later become tender to touch.
Glomovenous malformation may be suspected by its clinical appearance, but may undergo biopsy. Histology resembles venous malformation with large, dilated, thin-walled veins in the dermis and subcutaneous tissue. Clusters of α-actin-positive glomus cells are found lining the venous spaces.
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