Abstract
A 19-year-old young man was referred to our hospital with a chief complaint of severe trimsus. The amount of opening was only 3 mm. While the patient was playing baseball 3 months ago, he felt a severe pain at the right part of the neck. After that, severe trismus occurred gradually. The clinical diagnosis was extracondylar ankylosis due to severe cicatricial changes of the right upper neck and retromandibular fossa.
At surgery, extensive cicatricial changes were noted in the upper superficial cervical fascia. The medial pterygoid muscle was resected and examined microscopically, because the consistency was remarkably hard. Muscular fibrils had disappeared and formed the extensive fibrosis at the lower part of the muscle.
The trismus improved remarkably 3 months after the operation.
