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positive c-anca 1:640 with negative pr3

What autoimmune disorders can have strongly positive c-anca but have negative pr3. I have vasculitis in my left eye and I had an abnormal chest xray. Ct guided biopsy was negative for cancer. Dr Foster (as featured on Mystery Diagnosis TLC network) tentatively thought it was sarchoid but my pulmonologist says it isn't. All my other tests were negative except for a slightly elevated ana of 1:80. I have so far been less than confident in the diagnoses. I am of the understanding that it is rare to have a highly positive c-anca but be negative for pr3. Can anyone offer their input as to what direction I should go next?
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