Intravascular papillary endothelial hyperplasia, or Masson's tumour, is a benign lesion of the subcutaneous tissue and skin, characterised by a reactive proliferation of endothelial cells within a vessel. Although this pathology can occur at various sites, it is generally rare. Differential diagnosis with other benign lesions or malignancies can be challenging, and since its circumscribed nature is impossible to recognise with a biopsy, excision is frequently required.
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