Joint tumors
Synovial hemangioma

Author: Vijay Shankar, M.D. (see Authors page)

Revised: 6 September 2017, last major update June 2013

Copyright: (c) 2002-2017,, Inc.

PubMed Search: Synovial hemangioma [title]

Cite this page: Shankar, V. Synovial hemangioma. website. Accessed April 25th, 2018.
Definition / general
  • Uncommon; usually young adults, more common in males
  • Presents as nontraumatic joint swelling with recurrent effusions
  • Knee, elbow, finger
Radiology images

Images hosted on other servers:

MRI of knee of 32 year old man

Case reports
Gross description
  • Tumor usually confined to intra-articular synovium, may be in adjacent bursa
Gross images

Images hosted on other servers:

Heavily pigmented soft tissue mass

Microscopic (histologic) description
  • Resembles either cavernous hemangioma, lobular capillary hemangioma, arteriovenous hemangioma or venous hemangioma
Microscopic (histologic) images

Images hosted on other servers:

Fig. 1: Well circumscribed lesion composed of a fibrotic stroma and thin walled capillary vessels, with associated thrombi formation (H&E 20x);
Fig. 2: A closer view of the lesion showing the presence of organized thrombi in the lumen of some vessels and a flat layer of benign endothelial cells (H&E 100x);
Fig. 3: CD31 special stain demonstrating strong reactivity of the lining endothelium (100x)


Hyperplastic synovium

Dilated vascular spaces

Cavernous blood vessels

Differential diagnosis