The fissure for ligamentum teres sign or extrahepatic ligamentum teres sign is a radiographic sign of pneumoperitoneum. It represents the outline of the ligamentum teres (remnant of an obliterated left umbilical vein) with free abdominal gas in a supine patient, as seen on a plain abdominal radiograph.
- 1. Luigia Romano, Antonio Pinto. Imaging of Alimentary Tract Perforation. (2014) ISBN: 9783319081922