The telltale triangle sign, also known as the triangle sign or telltale triangle, is a radiographic sign seen on plain abdominal radiographs in a supine, cross table lateral or decubitus view that signifies presence of pneumoperitoneum, of any cause 1,2.
It describes the appearance of a radiolucent triangle of gas formed between three loops of bowel or between two loops of bowel and the abdominal wall 1.
- 1. Huang M-Y, Chang W-H. Telltale Triangle of Pneumoperitoneum. (2009) The New England journal of medicine. 361 (1): 73. doi:10.1056/NEJMicm0801361 - Pubmed
- 2. Seibert JJ, Parvey LS. The telltale triangle: use of the supine cross table lateral radiograph of the abdomen in early detection of pneumoperitoneum. (1977) Pediatric radiology. 5 (4): 209-10. Pubmed