A small round or oval, mostly subcutaneous nodule made up chiefly of a mass of Aschoff bodies and seen in cases of rheumatic fever. It is differentiated from the RHEUMATOID NODULE which appears in rheumatoid arthritis, most frequently over bony prominences. (From Dorland, 27th ed). The phenotype is rheumatic fever nodule (EFO_1001416). Also known as: Aschoff body, Aschoff nodule, rheumatic Aschoff nodule, rheumatic nodule.