Nonneoplastic disease
Synovial cyst

Topic Completed: 1 February 2013

Minor changes: 26 September 2019

Copyright: 2002-2019,, Inc.

PubMed Search: Synovial cyst [title] general

Related topics: Spinal synovial cyst, cutaneous metaplastic synovial cyst

Vijay Shankar, M.D.
Page views in 2019: 9,879
Page views in 2020 to date: 3,208
Cite this page: Shankar V. Synovial cyst. website. Accessed May 24th, 2020.
Definition / general
  • Herniation of synovium through joint capsule
  • Usually present in joint of extremeties
  • In spine, referred to as spinal cyst
  • Called Baker cyst if in popliteal space
  • May bleed and become a mass-like lesion
Diagrams / tables

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Baker cyst

Microscopic (histologic) description
  • Baker cyst: palisading histiocytes and fibrinoid necrosis, similar to rheumatoid pericarditis and rheumatoid nodules
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