14th September 2020

An 18-year-old female presents with recurrent left-sided knee pain

An 18-year-old female presents with recurrent left-sided knee pain. This occurs most commonly when she does some mild exercises. She describes noticing a small lump on the lateral aspect of her knee joint, which subsequently resolves spontaneously. Physical examination was unremarkable.

For the patient above, please select the SINGLE most likely diagnosis. Select ONE option from the list above.