RBC casts are found in -: (A) DM, (B) Wegeners Granulomatosis, (C) SEE, (D) Ankylosing spondylitis
Answer is B. One of the component of Wegener's granulomatosis is focal or diffuse necrotising glomerulonephritis , which is the reason for the presence of RBC casts. Ref Harrison20th edition pg 2122