Q18: Other congenital malformations of face and neck
Q18.0: Sinus, fistula and cyst of branchial cleft
While developing in the womb, many different types of tissue develop in the body. The organs and body parts develop out of the various types of tissue. While developing in the womb, the tissue can change its form and its position in the body. Some tissues merge into one another. Other tissues also degenerate to some degree during development. If tissue fails to develop properly, defects can occur.
Defects in the face or neck can take on different forms. A passage can form in the tissue of the neck, for example. The opening of a passage in the neck can be visible as a hole. But the opening of a passage can also be located inside the neck. If a passage comes to an end inside the tissue, it is called a sinus. If a passage goes through and joins two surfaces of tissue with one another, it is called a fistula. The defect may also take the form of a cyst. A cyst is a self-contained cavity in the tissue that is filled with fluid. From the outside, a cyst in the neck can seem to be a painless swelling.
Patient Disclaimer
The information provided on this page is for general educational purposes only. It is not intended for self-diagnosis and does not replace professional medical advice. Always consult your doctor or a qualified healthcare provider with any questions or concerns about your health.
If you see an ICD diagnosis code (e.g., on a medical report), be aware that doctors may also include additional indicators to express diagnostic certainty. Only a healthcare professional can interpret these codes accurately in the context of your individual case.
For a complete understanding of your condition and what the diagnosis means for you, please speak directly with your doctor.