Frey's syndrome following submandibular gland excision: an unusual postoperative complication

Frey's Syndrome: A Review of Aetiology and Treatment

First described by Polish Neurologist Łucja Frey in 1923, Frey's syndrome (FS), or auriculotemporal syndrome, is a rare condition characterised by gustatory sweating, typically encountered as sequelae following invasive head and neck surgery. The pathophysiology of FS can be described by aberrant reinnervation of postganglionic parasympathetic neurons to the surrounding denervated sweat glands and cutaneous blood vessels. Multiple invasive procedures have been associated with FS ranging from salivary gland surgery to burn reconstruction and thoracoscopic sympathectomies. Rarely, FS can be secondary to trauma or non-surgical aetiologies, including diabetes and infection. Physical symptoms vary based on the severity and surface area affected by FS and range from mild symptoms to severe psychosocial morbidity for patients. Surgeons operating in the head and neck, including otolaryngologists, maxillofacial surgeons, and plastic surgeons, should be aware of this potential complication and be up to date with diagnosis and treatment strategies for FS. This review article summarises the literature relating to FS focusing on its aetiologies, symptomatology, prevention, and available treatments, aiming to provide an up-to-date review of this condition for surgeons operating in the head and neck region. Although various treatment options have been suggested, these are often limited to topical agents that require life-long administration for symptom control. Further research is recommended to identify the optimal treatment for this condition and the role of surgery as a treatment for severe or refractory cases.

Perioral gustatory sweating: case report

OBJECTIVE

Presentation of a case of perioral Frey syndrome.

DESIGN

Case report.

SUBJECT

A 72-year-old woman with hyperhidrosis around the mouth and chin.

RESULTS

This patient suffered from bilateral perioral gustatory sweating following a mandibular osteotomy; such a case has not previously been described. Possible pathophysiological hypotheses are discussed in relation to the anatomy and innervation of the salivary glands.

CONCLUSION

Perioral gustatory sweating is a rare complication of osteotomy.

Management of Frey's syndrome and hypersialorrhea with botulinum toxin

Botulinum toxin (BTX) is a safe and reliable drug for the treatment of Frey's syndrome and hypersialorrhea. Currently, the intradermal injection of BTX is the standard treatment of Frey's syndrome. A disappearance of Frey's syndrome for 1 to 1.5 year could almost be promised. Recently, BTX was introduced for the treatment of hypersialorrhea. Although some questions exist about the optimal dosage and the type of major salivary glands that should be treated, hypersialorrhea was reduced in almost all affected children and adults for up to 6 months by using ultrasound-guided intraglandular BTX injections.