Table 1.

Patient characteristics and findings.

Parameters	Case 1	Case 2	Case 3	Case 4	Case 5
Age	65	35	25	32	40
Sex	Female	Male	Female	Female	Male
Comorbidity	Hypertension	None	None	None	Type 2 diabetes mellitus
History of COVID-19 infection (weeks) prior to presentation	8	6	8	10	6
Distribution of joint involvement	Both hands, including small joints	Both hands, including small joints	Generalized	Both hands, including small joints	Both hands, including small joints
Duration of joint pain	4 weeks	2 weeks	15 days	6 weeks	2 weeks
Physical examination	Bilateral tenderness in wrists and PIP joints	Bilateral tenderness in wrists and MCP joints	Bilateral tenderness in wrists, MCP, ankles, and MTP joints	Bilateral tenderness in wrists and PIP joints	Bilateral tenderness in wrists and few MCP joints
Synovitis in the musculoskeletal ultrasound scan	Grade 2 synovitis in bilateral wrists and MCP joints 2 and 5  Grade 1 synovitis in bilateral PIP joints 2–4	Grade 2 synovitis in bilateral wrists, MCP joints 2–5, ankles, and MTP joints 2 and 5  Grade 1 bilateral PIP joints 2–5	Grade 2 synovitis in bilateral ankles and MTP joints 2 and 5  Grade 1 synovitis in bilateral wrist, PIP joints 2–5, and MCP joints 2–5	Grade 2 bilateral synovitis in wrists and MCP joints 2, and PIP joints 2–5	Grade 2 synovitis in bilateral wrists and MCP joints 1–5

PIP: proximal interphalangeal; MCP: metacarpophalangeal; MTP: metatarsophalangeal.