Dr. Francisco Bengoa
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Soft-tissue tumors

Pseudomyogenic hemangioendothelioma

Soft tissueIntermediate / locally aggressive or rarely metastasizingVascular tumours

Epidemiology

A rare vascular tumor of adolescents and young adults, with a preference for the limbs. Multifocality within a single limb does not always mean disseminated disease, but it changes local planning.

Basic features

It can form multiple nodules in the skin, subcutaneous tissue, muscle, or bone within a single limb. It is confirmed by the characteristic rearrangement of the FOSB gene (often SERPINE1::FOSB), which separates it from epithelioid sarcoma, which it can closely resemble.

Usual treatment

Removal is used when the disease is localized; multifocal disease may require monitoring, local therapies, or systemic treatment.

Outcomes and prognosis

Local recurrence is common (often as new lesions in the same limb) and spread to distant sites is rare, so management is individualized.

Warning signs

These signs do not necessarily mean cancer, but they warrant evaluation before operating on or needling a mass.

  • A soft-tissue mass that grows, is larger than 5 cm, or is deep.
  • Persistent, night-time or progressive bone pain, especially if it limits activity.
  • A fracture from minimal trauma, or an aggressive bone lesion on an X-ray.
  • A lump that comes back after previous surgery.
  • Neurological symptoms, rapid swelling, or pain associated with a mass.

This information is general and does not replace a medical evaluation. A musculoskeletal tumor must be interpreted together with imaging, physical examination, biopsy when appropriate and each patient's context.

Specialist evaluation

If you have a mass, a bone lesion or a report suggesting a tumor, book an evaluation.

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