Case Presentation: Xanthogranulomatous Pyelonephritis (XGP) is an uncommon sequelae of chronic renal inflammation whose process may invade local structures.  We present a rare case of an invasive Xanthogranulomatous Pyelonephritis (XGP) extending into the thoracic cavity in a 48 year-old female presenting with chronic productive cough. This previously healthy patient presented with dyspnea, productive cough, and [...]