Nonneoplastic disease
Synovial cyst

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

Revised: 15 August 2017, last major update February 2013

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

PubMed Search: synovial cyst [title] general

Related topics: spinal, cutaneous metaplastic
Shankar, V. Synovial cyst. website. Accessed August 18th, 2017.
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