Which statement is true regarding malignant melanoma that occurs intra orally?

The statement regarding malignant melanoma that is true is that the 5-year survival rate is 20%. This low survival rate highlights the aggressive nature of malignant melanoma, especially when it occurs in uncommon sites like the oral cavity. Melanoma is known for its potential to metastasize rapidly, which contributes to poorer prognosis rates and survival statistics.

Intraoral melanomas are rare, and due to their late presentation and difficulty in early detection, they often lead to advanced disease at the time of diagnosis. The 20% survival rate reflects the challenges in treating advanced melanoma and the importance of early identification and intervention.

The other options reflect misconceptions or inaccuracies surrounding oral malignant melanoma. The condition is indeed not common in certain areas like the palate, it is critical to undertake a biopsy to properly diagnose and inform treatment strategies, and the occurrence of oral melanomas is rare rather than common. Understanding these distinctions helps in recognizing the unique aspects of malignant melanoma in the oral region.