Intravascular papillary endothelial hyperplasia

Intravascular papillary endothelial hyperplasia, also Masson's hemangioma, is a benign vascular lesion.

It is also known as a Masson tumour.

General

• Benign non-neoplastic lesion - a vessel that has thrombosed and recanalized.
• Histomorphologically may be confused with low-grade angiosarcoma or other soft tissue sarcomas.

Microscopic

Features:

• Well-circumscribed - key (low power) feature.
• Abundant small vascular channels with benign endothelium.
• +/-Papillary formation with a fibrotic core covered by benign endothelium.

Notes:

• Looks like Kaposi sarcoma at high power.

Images:

• Masson hemangioma - several images (upmc.edu).

See also

• Vascular tumours.
• Hemangioma.