<prompt> Empyema necessitans is defined as so when ?Plural empyema is under pressurePleural empyema has ruptured into bronchusPleural empyema has ruptured into the pericardiumPleural empyema is showing extension to the subcutaneous tissue  <response>: Ans. is d i.e., Pleural empyema is showing extension to the subcutaneous tissue 