Oral amelanotic melanoma.

Area of Science:

• Oncology
• Dermatology
• Head and Neck Surgery

Background:

• Malignant melanomas of the head and neck mucosal regions are rare, comprising less than 1% of all melanomas.
• Oral cavity accounts for about half of head and neck melanomas, with up to 75% being amelanotic (lacking pigment).
• Etiologic factors for oral melanomas are not well-established, though oral habits and self-medication are suspected.

Purpose of the Study:

• To review the characteristics, diagnosis, and management of oral melanomas, with a focus on the amelanotic variant.
• To highlight the diagnostic challenges and poor prognosis associated with amelanotic oral melanomas.

Main Methods:

• Review of existing literature on oral melanomas.
• Discussion of histopathological features, including spindle-shaped cells and mitotic figures.
• Emphasis on immunohistochemistry markers (S-100, HMB-45, Melan-A, MART-1) for diagnosis.

Main Results:

• Amelanotic oral melanomas are difficult to diagnose, often presenting in advanced stages.
• These neoplasms exhibit aggressive biological behavior.
• Diagnosis relies on histopathology and immunohistochemistry due to lack of pigmentation.

Conclusions:

• Oral melanoma, especially the amelanotic type, is associated with a poor prognosis.
• Delayed diagnosis due to subtle presentation and difficulty in identification contributes to the poor outcome.
• Radical surgery and adjuvant chemotherapy are standard management, but outcomes remain challenging for amelanotic variants.