Samerchua A, Kongwatmai K, Boonsri S, et al. - Given the external anatomical landmark and the radiological landmark have been proposed to afford estimation of the depth of right internal jugular venous catheter during insertion, researchers undertook this prospective observational analysis including children ages 1-15 years, to compare these two landmarks in terms of accuracy, agreement, and reliability, confirmation being by transesophageal echocardiography. This study included 80 participants with a median age of three years. The median (IQR) variations between the depth of the transesophageal echocardiography and the external anatomical landmark or the radiological landmark were identified to be 0.30 (0, 0.70) and 0.10 (-0.20, 0.90) cm respectively. Findings revealed that accurate estimation of the central venous catheter depth close to the superior vena cava and the right atrium junction was afforded by both the external anatomical landmark and the radiological landmark. The greater potential utility of the external anatomical landmark vs the radiological landmark in clinical practice was suggested.