MS-3465

MS-3465

A 26-year-old gardener presents to her GP with a two week history of elbow swelling. She reports a gradual onset of the swelling, with no apparent triggers, and experiences pain and warmth upon touch. She denies any swelling in other areas and is generally in good health.

The patient has a medical history of well-managed rheumatoid arthritis and is currently taking methotrexate. There are no other known medical conditions.

During the physical examination, a tender, soft, fluctuant mass is palpated on the posterior aspect of the patient’s elbow.

Based on the above information, what is the most probable diagnosis?