Numb chin syndrome--a reflection of systemic malignancy

Area of Science:

• Neurology
• Oncology
• Diagnostic Medicine

Background:

• Numb chin is an uncommon neurological manifestation of metastatic malignancy.
• It presents as unilateral numbness or orofacial pain, often in the inferior alveolar nerve distribution.
• This symptom can be an early indicator of underlying systemic cancer.

Purpose of the Study:

• To highlight the significance of numb chin syndrome as a potential indicator of metastatic malignancy.
• To emphasize the importance of considering cancer in patients presenting with unexplained chin numbness.
• To underscore the need for prompt diagnostic workup in such cases.

Main Methods:

• A case presentation of a 50-year-old patient with right numb chin is described.
• Diagnostic investigations included dental examination, blood tests, CT scan, and bone marrow biopsy.
• The patient's clinical course, including symptom progression and organ function deterioration, was monitored.

Main Results:

• No dental cause was identified for the patient's numb chin.
• The patient later developed generalized symptoms, liver and renal dysfunction, and a leucoerythroblastic blood picture.
• High-grade lymphoblastic lymphoma was diagnosed via CT scan and bone marrow biopsy, leading to multiorgan failure and death.

Conclusions:

• Numb chin syndrome is a presenting sign of systemic malignancy, characterized by unilateral numbness or orofacial pain.
• Physicians and dentists must consider metastatic cancer in patients with unexplained chin or jaw numbness.
• Early recognition and investigation are critical for timely diagnosis and management of underlying malignancies.