Microbiology Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli) ab89a438 Most common extra pulmonary involvement of TB ? A Bone B Lymph nodes C Pleura D Ileocecal High-Yield Explanation Most common extra pulmonary involvement: lymph nodes > pleura> ileocecal - GI TB most common site- ileocecal