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J Am Dent Assoc, Vol 140, No 5, 550-554.
© 2009 American Dental Association
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CLINICAL PRACTICE

The Importance of Clinical Features and Computed Tomographic Findings in Numb Chin Syndrome

A Report of Two Cases



Izumi Yoshioka, DDS, PhD, Shunji Shiiba, DDS, PhD, Tatsurou Tanaka, DDS, PhD, Takeshi Nishikawa, DDS, Eiji Sakamoto, DDS, PhD, Shinji Kito, DDS, PhD, Masafumi Oda, DDS, Nao Wakasugi-Sato, DDS, PhD, Shinobu Matsumoto-Takeda, DDS, PhD, Shigeyuki Kagawa, DDS, Osamu Nakanishi, DDS, PhD, Kazuhiro Tominaga, DDS, PhD and Yasuhiro Morimoto, DDS, PhD

Background. Dentists need to be aware of the relationship between malignancies and paresthesia or complete loss of sensation in a jaw segment. In particular, dentists should be aware of numb chin syndrome (NCS) and its clinical manifestations, as well as the limitations of using panoramic radiographs to detect the causative malignancy.

Case Descriptions. The authors report two cases of paresthesia in the mental region. No lesions were readily apparent on the patients’ panoramic radiographs. To exclude the presence of disease in the mandible that could have been responsible for the NCS, the authors obtained computed tomographic (CT) images. They identified metastases to the mandible from primary malignant tumors elsewhere in the body.

Clinical Implications. To prevent misdiagnosis of NCS, dentists need to be aware of the clinical manifestations of NCS, the need for CT imaging, the shortcomings of panoramic radiographs and the value of obtaining detailed and accurate medical and dental histories from patients.

Key Words: Numb chin syndrome; paresthesia; panoramic radiograph; metastasis; malignancy; jaws

Abbreviations: CT: Computed tomographic. • NCS: Numb chin syndrome. • PSA: Prostate specific antigen.






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