Facial palsy may represent a serious local or generalized disease process which should not be labeled Bell's palsy until all possible causes have been excluded. Evaluation of such a patient includes topographical diagnostic studies of the facial nerve, and complete otolaryngologic examination, as well as appropriate laboratory studies. Symptoms in a region of a previous tumor may represent residual tumor even when the clinical pattern is atypical, as in this case of invasive basal cell carcinoma.
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Mark May (1972) studied this question.
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