BACKGROUND PAS (Preauricular Sinus) is a common congenital condition of external ear. It is seen in front of external ear as a small dimple or pit. When infected, it presents as swelling with pain and discharge from sinus with foul smell. There are many terminologies used for this condition like preauricular pit, preauricular tract and helical fistula. 1 It was first described by Heusinger in 1864. 2 It is more often unilateral than bilateral. Right side is more involved and females are more affected than males. 3 PAS is an embryological malformation associated with development of pinna in 6th week of gestation. Embryologically six mesenchymal hillocks form the auricle-three hillocks from first arch and three hillocks from the 2 nd arch. These hillocks fuse to form the pinna and incomplete fusion of these hillocks give rise to preauricular sinus. 1 Another theory states that PAS develops from ectodermal folding. (4,5,6) OBJECTIVE The rationale of this study is to highlight the surgical advantage achieved with the aid of operating microscope combined with standard surgical techniques.
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