The joint effort: MSK quiz

A 37-year-old male from South India presented with complaints of painful non-progressive swelling in the dorsal aspect of the mid-forearm for 2 months.There was no history of fever, trauma, or previous surgery.On palpation, there was a firm swelling without any redness or change in local temperature.He was referred to the radiology department for an ultrasound (USG) evaluation.