A middle aged female presents with polyahritis, elevated Rheumatoid factor and ANA levels. Which of the following features will help in differentiating Rheumatoid ahritis from SLE

Answer is C i.e. (Aicular erosions on X ray): SLE is associated with non-erosive ahritis. Presence of aicular erosions on X Ray suggests a diagnosis of' Rheumatoid Ahritis `Erosions on joint X-Rays are rare in SLE; their presence suggests a non-lupus inflammatory ahropathy such as Rheumatoid Ahritis' - Harrison 17th/2077 `SLE may he confused with other connective tissue disease, especially Rheumatoid Ahritis. SLE patients may have positive Rheumatoid Factor. The usual presentation of lupus ahritis is identical to that of Rheumatoid Ahritis, but SLE ahritis is rarely erosive.' - Current Rheumatology 2nd/208