Premature newborn now 2 weeks old with sepsis who had an umbilical arterial catheter placed at birth which was removed after a week

US of aortic thrombus due to umbilical arterial catheter
Sagittal and transverse grayscale US of the aorta shows an echogenic, linear object within the aorta which on color doppler US was seen to have blood flow around it.

The diagnosis was non-occlusive thrombus of the aorta secondary to past umbilical arterial catheterization.