A member asked:

My daughter is six years old and just noticed a large lump behind the knee she said she has no pain but i am a little worried what could this be ? should i worry it is the size of an egg

4 doctors weighed in across 2 answers
Dr. Michael Thompson answered

Specializes in Hematology and Oncology

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

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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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