February 2019

45 year old Female with Enlarging Mass in Posterior Knee

History
45yo F ballroom dancer presents with a “lump” in right posterior knee that has been growing over the last few years and now causes paresthesias along right lateral leg upon palpation. She reports that it is bothersome especially during dancing. No family history of “lumps”

Exam
Awake, alert, oriented
Cranial nerves II-XII are intact
Strength- 5/5 upper extremities and lower extremities
No sensory loss
DTR within normal limits
Gait normal
Palpable 2cm mass in lateral popliteal fossa that causes radiating right lateral leg pain and paresthesia with +Tinel sign
No abnormal cutaneous lesions

Figure 1

Figure 2

Questions

 
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