Endoscope-Assisted Surgery of the Elongated Styloid Process Using the Retroauricular Approach: An Anatomic Study for Clinical Application

Abstract

Surgical shortening of the styloid process (SP) mainly involves intraoral and transcervical approaches. A retroauricular incision was performed by our surgical team in endoscope-assisted shortening of the SP. This study aimed to clarify the important anatomic landmarks and adjacent structures around the SP through a retroauricular approach. Fifteen fresh corpses (30 sides) were dissected via a retroauricular approach, and indexes were measured. The great auricular nerve (GAN) was divided into the anterior ear branch, lobe branch, and posterior ear branch. The distance from the branch of the GAN to the root of the ear lobe was 21.96±2.55mm. In the space around the SP, the vertical distance from the junction of the diabetic posterior belly and the mastoid tip to the SP was found to be 12.29±2.46mm, with a total distance between the skin in front of the mastoid and the facial nerve of 21.63±3.27mm. The distance between the facial nerve across the SP and the root of the SP was 11.93±2.32mm. The retroauricular incision starts from the level of the notch between the tragus and extends backward in an arc to avoid injury to the retroauricular branch of the GAN. The posterior fascia of the parotid gland and the leading edge of the sternocleidomastoid muscle, posterior belly of the digastric muscle, and styloid hyoid muscle are regarded as landmarks for the SP.