Bursitis: Sounds like accumulation of fluid in a bursa -- eg the semimembranous bursa - http://orthoanswer.org/knee-leg/knee-bursitis/definition.html - See your pediatrician for further evaluation.
Answered 2/8/2015
3.2k views
Evaluation: Swelling behind the knee suggests a popliteal or Baker's cyst. This is uncommon in children but warrants evaluation.
Answered 11/3/2016
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