'E' letter for Trachea indicates a flexible tube that has c-shaped cartilaginous rings that keep it from collapsing.
There are many cartilage rings in a typical trachea (windpipe) (a strong and flexible tissue). These C-shaped rings give your child's trachea support while enabling it to bend and move naturally during breathing.
These rings are O-shaped rather than C-shaped due to a congenital anomaly known as full tracheal rings. Your youngster may get aberrant windpipe thinning and airway stenosis as a result. The trachea has between 16 and 20 rings.
This cartilage defect may have an influence on any number of those rings. While some kids with full tracheal rings may at first only show minor breathing issues, other kids might be in serious respiratory distress.
Learn more about the Trachea with the help of the given link: