Abstract
Numb Chin Syndrome with Four Fulminant Attacks in 16 Years
Highlights
Numb chin syndrome (NCS) is called, “mental nerve neuropathy,” and is defined as a sensory neuropathy, characterized, in some cases, by pain and, in all cases, by numbness of the unilateral or bilateral chin and lower lip within the mental or inferior alveolar nerve distribution
Our search revealed that of these 576 patients from 19 countries, 137 cases were benign, while alarmingly as many as 439 were malignancies including 11 deaths
Relatively rare signs and symptoms, when they do present, they are known collectively as numb chin, and are most often a prodromal sign of a serious malady, as in the 439 cases (76%) in the present review
Summary
Numb chin syndrome (NCS) is called, “mental nerve neuropathy,” and is defined as a sensory neuropathy, characterized, in some cases, by pain and, in all cases, by numbness (hypoesthesia, paresthesia, dysesthesia, and anesthesia) of the unilateral or bilateral chin and lower lip within the mental or inferior alveolar nerve distribution. The presenting symptom of numb chin, with or without comorbid lower lip anesthesia, is more often associated with cancer, either as the first symptom or manifesting during the outcome, than with benign diseases [31,32]. The first NCS attack of this patient occurred at the age of 52 years old with only the presenting symptoms of dysesthesia and a thickening sensation of the right lower lip and chin, local fever, and slight pain. All the exam results came back within normal limits, without any remarkable findings Possible dental problems, such as tooth extraction, trauma, abscess, or osteomyelitis, were all ruled out by thorough evaluation by a 20year veteran, expert dentist. Subjective symptoms and findings on attacks were recurrent mental nerve neuropathy, a non-necrotizing symptom of a localized, dysesthesia, atypical facial pain in the right lower lip and chin, and general dullness in the jawbone. Painful and an inconvenience during the periods of infliction, the present case has been benign for 16 years to date, at 68 years of age
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