Term: psoriatic arthritis: a form of rheumatoid arthritis usually affecting fingers and toes and associated with psoriasis
Broader: rheumatoid arthritis: a chronic autoimmune disease with inflammation of the joints and marked deformities; something (possibly a virus) triggers an attack on the synovium by the immune system, which releases cytokines that stimulate an inflammatory reaction that can lead to the destruction of all components of the joint | Unrelated: stately home: a mansion that is (or formerly was) occupied by an aristocratic family
Broader: rheumatoid arthritis: a chronic autoimmune disease with inflammation of the joints and marked deformities; something (possibly a virus) triggers an attack on the synovium by the immune system, which releases cytokines that stimulate an inflammatory reaction that can lead to the destruction of all components of the joint | Unrelated: cash crop: a readily salable crop that is grown and gathered for the market (as vegetables or cotton or tobacco)
Broader: rheumatoid arthritis: a chronic autoimmune disease with inflammation of the joints and marked deformities; something (possibly a virus) triggers an attack on the synovium by the immune system, which releases cytokines that stimulate an inflammatory reaction that can lead to the destruction of all components of the joint | Unrelated: triatoma: conenoses