Three cases are presented to compare and contrast the radiographic findings in hydropneumothorax versus simple pleural effusion. The first case is of a 72-year-old man with metastatic colon cancer presenting with worsening shortness of breath. Post-thoracentesis chest radiographs (Fig 1) and CT (Fig 2) demonstrate a hydropneumothorax. The second case is of a 67 year-old male with non-small cell...

1Division of Pediatrics, Children’s Medical Center, Tehran University of Medical Sciences, Tehran, IR Iran 2Division of Pediatrics, Shahid Madani Hospital, Tabriz University of Medical Sciences, Tabriz, IR Iran *Corresponding author: Keyhan Sayadpour Zanjani, Division of Pediatrics, Children’s Medical Center, Tehran University of Medical Sciences, Tehran, IR Iran. Fax: +98-2122132219, E-mail: k...