Intravascular papillary endothelial hyperplasia
Intravascular papillary endothelial hyperplasias, also known as Masson tumors, are rare non-neoplastic vascular proliferations.
Patients usually present with an enlarging soft tissue mass 1.
The lesion is a reactive process characterized by endothelial cell proliferation in the setting of venous stasis commonly associated with thrombosis. The pure form consists of organized thrombus limited to the vascular lumen. The mixed form arises in the setting of a preexisting vascular lesion such as hemangioma.
Lesions are most commonly located in subcutaneous soft tissues and associated with a visible origin vessel. They are usually small (<2 cm), well-defined, round or oval, and heterogeneous in signal 1-6.
- T1: iso- to slightly hyperintense, with nodular foci of high signal intensity
- T2: hyperintense peripherally, with nodular foci of low signal intensity
- T1 C+: peripheral/septal or central enhancement
Treatment and prognosis
The treatment is surgical resection. The pure form of intravascular papillary endothelial hyperplasia carries no risk of recurrence when completely resected.
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