Swollen elbow

49 y white gentleman, with past medical history of mood disorder, NOS, presents to the clinic with progressively increasing swelling of the left elbow, after sustaining a direct trauma on the elbow a few weeks ago. He complaints of mild discomfort but denies and systemic symptoms- fever, chills and denies and restrictions in joint movements. On exam, his vital signs are stable. The left elbow displays are large cystic swelling on the posterior aspect, with mild superficial redness, without any warmth, tenderness or restricted ROM.

What is the most likely diagnosis?

1. Acute gout
2. Acute septic olecranon bursitis
3. Traumatic olecranon bursitis
4. Acute Monoarticular arthritis