<unk>  occurs due to elongation of the styloid process or calcification of the stylohyoid ligament. However, the cause of the elongation hasn’t been known clearly. It could occur spontaneously or could arise since birth. Usually normal stylohyoid process is 2.5–3 cm in length, if the length is longer than 3 cm, it is classified as an elongated stylohyoid process.
Eagle syndrome
Galloway Mowat syndrome
Zaki syndrome
Cohen syndrome
Seaver Cassidy syndrome
Tietze syndrome
Austrian syndrome
Wellens' syndrome