TABLE 8.

Differential diagnosis of ReA

Inside the SpA groupOther “boundaries” of ReAOutside the SpA group
Psoriatic-associated arthropathiesRheumatic feverOther sexually acquired arthritis (gonococcal, HIV)
SAPHO syndrome (synovitis, acne, pustulosis, hyperostosis, osteitis)Parasitic arthritis
Crohn’s disease/ulcerative colitis-associated arthritis Brucella ReARA
ASGouty arthritis
Behcet syndrome
Parvovirus arthropathies
Lyme disease
Sarcoid arthritis
Occult celiac disease
Pseudoinflammatory lower back pain