Difficult: to answer based on limited information, but could be a bursal fluid collection/bursitis, ganglion cyst, meniscal cyst, or popliteal cyst. These wouldn't show up on xray. They would be seen easily on MRI.
Answered 2/7/2015
3.4k views
A doctor has provided 1 answer
A doctor has provided 1 answer
5 doctors weighed in across 2 answers
A doctor has provided 1 answer
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question