Numb chin syndrome reflects an abnormality in the mental nerve or inferior
alveolar nerve, or occasionally in a nervous structure located higher up in
the body. It manifests as objective and/or subjective sensory disorders in
the distribution of the mental nerve or inferior alveolar nerve, represent
ed primarily by half of the lower lip and chin. Although numb chin syndrome
falls mainly within the province of dentists and stomatologists, it can re
veal a number of neoplastic or other diseases seen by rheumatologists. This
article provides background information on numb chin syndrome, discusses i
ts causes (including those seen mainly by dentists and stomatologists), and
reviews numb chin syndrome due to generalized malignancies based on 144 ca
ses from the literature and two personal cases. (C) 2000 Editions scientifi
ques et medicales Elsevier SAS.