Explore a comprehensive lecture on Crohn's Disease, covering signs and symptoms, pathophysiology, and treatment. Delve into the definition, etiology, risk factors, and clinical course of this inflammatory bowel disease. Examine disease pathogenesis, organ involvement, and extraintestinal manifestations. Compare Crohn's Disease with Ulcerative Colitis, and learn about classification and diagnostic approaches. Gain valuable insights for USMLE and NEET PG exam preparation in this detailed gastroenterology lecture.