CT findings in transdiaphragmatic empyema necessitatis due to tuberculosis.

A case of transdiaphragmatic empyema necessitatis due to tuberculosis presented clinically as a subcutaneous mass in the posteroinferior right chest. Imaging studies revealed a 12 cm diameter suprahepatic mass contiguous with thickened and calcified right pleura. Even in the preantibiotic era, such a presentation of empyema necessitatis was very unusual.