Baker's cyst, popliteal cyst, giant cyst.

What is Baker's cyst? 
The exact origin is not known, but it is a distended bursa arising from any one of the structures below:
  • Between hamstrings and collateral ligaments. 
  • Between hamstrings and tibial condyles. 
  • Each head of gastrocnemius. 
What is giant cyst? 
It is a huge popliteal cyst commonly in rheumatoid arthritis. 
Treatment:-
  • 1-2 days of non- surgical treatment
  • Later, arthrography and cyst is excited
  • Synovectomy is done later to prevent recurrence. 

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