Neck Masses

Question 1

How does failure of complete resorption of brachial arch present. Which arch is the most problematic

Answer 1

These can present as
cysts, cartilaginous remnants, sinuses or fistulae. Second arch anomalies are by far
the most common.

Question 2

Differences between cysts, sinus tract and fistula

Answer 2

Cysts are lined by epithelium without an external opening. Fistulae have an internal
and external communicating opening, and a sinus tract only has an internal or
external opening.