Abstract

A 4mm tumour depth has been deemed the critical tumour thickness that is associated with significant risk of occult metastases. Tumours of the anterior floor of mouth and oropharynx may metastasise bilaterally and metastases from the tongue have been reported to skip to level IV without involvement of proximal nodal levels. Dissection of the sub muscular recess produces a poor nodal yield with infrequent involvement, and is associated with an increased incidence of shoulder dysfunction.

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