Question category: Rheumatology
A 25 year old presents to her GP with proximal muscle weakness. She has also become increasingly short of breath and a cough. On examination there is obvious proximal muscle weakness and bibasal crackles. Her autoantibodies are checked and anti Jo-1 is positive. Other bloods reveal she has ARF with a CK of over 6000. Considering the diagnosis, what has caused the renal failure?