Lentigo maligna melanoma with deep invasion along the mental nerve.

A case of lentigo maligna melanoma on the vermilion of the right lower lip which invaded deeply along the mental nerve is described. The patient also had sensory loss and numbness in the area innervated by the mental nerve, which was the only sign of this rare mode of invasion in this case. Early excision of the lentigo maligna lesion is stressed, and if the patient complains of sensory disturbances in the area of the lesion, this might be a sign of deep invasion of the tumour along the nerve bundle.