Now let me search for Granulomatosis with Polyangiitis (GPA) in Murray's textbook (which likely refers to Murray & Nadel's Textbook of Respiratory Medicine or similar).

Murray & Nadel's is confirmed. Now let me read all the relevant blocks from Murray simultaneously.

Excellent content found. Now let me read the block 17 section and also more of block 20 for complete coverage including pathogenesis, labs, treatment.

I have a histopathology image. Let me now read more from block 20 - the treatment section, and search for pathogenesis/ANCA content in Murray.

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