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Florid extravascular papillary endothelial hyperplasia (Masson's pseudoangiosarcoma) presenting as a soft-tissue
M R Pins1, D I Rosenthal, D S Springfield
1Department of Pathology, Massachusetts General Hospital, Boston 02114.
Archives of Pathology & Laboratory Medicine
|March 1, 1993
Summary
Papillary endothelial hyperplasia, a benign endothelial cell proliferation, can rarely occur outside blood vessels. This study details an extravascular case mimicking soft-tissue sarcoma and reviews similar cases.
Area of Science:
- Pathology
- Vascular Biology
- Surgical Oncology
Background:
- Papillary endothelial hyperplasia (PEH), also known as Masson's pseudoangiosarcoma, is a reactive endothelial cell proliferation.
- PEH typically occurs within thrombosed vessels or vascular tumors, often as an incidental finding.
- Rare extravascular forms of PEH can histologically resemble angiosarcoma, posing diagnostic challenges.
Observation:
- A case of extravascular PEH extensively involving a large, traumatic, deep soft-tissue hematoma in a 19-year-old male is presented.
- The patient's clinical presentation mimicked a soft-tissue sarcoma.
- This presentation highlights the potential for PEH to arise in extraneoplastic and non-vascular settings.
Findings:
- A comprehensive literature review identified 314 cases of PEH.
- Among these, 13 cases were identified as likely extravascular PEH.
- The study characterizes the clinical and histological features of these rare extravascular lesions.
Implications:
- Extravascular PEH, though rare, must be distinguished from malignant vascular tumors like angiosarcoma.
- Accurate diagnosis is crucial for appropriate patient management and avoiding unnecessary aggressive treatment.
- Recognition of PEH in soft-tissue hematomas expands the differential diagnosis for soft-tissue masses.