Mucocutaneous venous malformations

Mucocutaneous venous malformations (VMCM), also known as venous malformations, multifocal, are a rare inherited vascular disorder characterized by the development of multiple small venous malformations (abnormal tangles of veins) in the skin, mucous membranes, and sometimes in underlying soft tissues. The condition is caused by gain-of-function mutations in the TEK gene (also known as TIE2), which encodes a receptor tyrosine kinase critical for vascular development and endothelial cell signaling. These malformations typically appear as bluish-purple, soft, compressible lesions on the skin and mucosal surfaces, including the lips, oral cavity, and gastrointestinal tract. The lesions are present from birth or early childhood and may increase in number and size over time. They can cause pain, swelling, and cosmetic disfigurement. In some cases, larger or deeper lesions may lead to localized intravascular coagulation, resulting in elevated D-dimer levels and occasionally bleeding complications. Unlike sporadic venous malformations, which are typically solitary and larger, VMCM lesions tend to be multifocal and smaller in size. The condition follows an autosomal dominant inheritance pattern with variable expressivity, meaning affected family members may have different numbers and locations of lesions. Treatment is primarily symptomatic and depends on the size, location, and symptoms of the malformations. Options include compression garments for pain management, sclerotherapy (injection of agents to shrink the malformations), and surgical excision for problematic lesions. More recently, sirolimus (an mTOR inhibitor) has shown promise in reducing the size and symptoms of venous malformations. A multidisciplinary approach involving dermatologists, vascular specialists, and interventional radiologists is typically recommended for optimal management.

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