Interlobar hydropneumothorax.

We report a case of interlobar hydropneumothorax in a 42-year-old male with chronic obstructive pulmonary disease and a history of tuberculosis in the past. The diagnosis was suspected from chest roentgenograms that showed an incompletely circumscribed air containing space with a fluid level. The diagnosis was confirmed by computed tomography. This unusual presentation of hydropneumothorax with striking radiological features prompted us to report this case.