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Joints
Joint tumors
Synovial hemangioma

Reviewer: Vijay Shankar, M.D. (see Reviewers page)
Revised: 15 June 2013, last major update June 2013
Copyright: (c) 2003-2013, PathologyOutlines.com, Inc.

General
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Uncommon; usually young adults, more common in males
Presents as nontraumatic joint swelling with recurrent effusions

Sites
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Knee, elbow, finger

Xray images
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MRI of knee of 32 year old man

Case reports
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4 year old boy with pain and swelling of knee (Indian J Pathol Microbiol 2001;44:353)
10 year old girl with pain and swelling in knee joint (Indian J Pathol Microbiol 2008;51:257)
12 year old boy with pain and swelling in knee joint (J Med Case Rep 2010;4:105)
25 year old man with knee pain (Acta Orthop Traumatol Turc 2004;38:224)
30 year old woman with elbow swelling (The Internet Journal of Pathology 2008;7(2))

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

Gross images
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Various images

Heavily pigmented soft tissue mass

Micro description
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Resembles either cavernous hemangioma, lobular capillary hemangioma, arteriovenous hemangioma or venous hemangioma

Micro images
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Figure 1

Figure 2

Figure 3

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: CD-31 special stain demonstrating strong reactivity of the lining endothelium (100X).

Hip

Hyperplastic synovium

Dilated vascular spaces

Cavernous blood vessels

Differential diagnosis
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Organizing hemorrhage (Hum Pathol 1993;24:737)
Pigmented villonodular synovitis

End of Joints > Joint tumors > Synovial hemangioma

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General =========================================================================

Sites =========================================================================

Xray images =========================================================================

Case reports =========================================================================

Gross description =========================================================================

Gross images =========================================================================

Micro description =========================================================================

Micro images =========================================================================

Differential diagnosis =========================================================================