Conclusion:
Adenoid cystic carcinoma is a malignant tumor characterized by features
such as slow growth, high infiltration potential, and hematogenous
distant metastasis. Minor salivary grand AdCCs should receive aggressive
treatment to achieve negative surgical margins to inhibit recurrence. In
this article, two cases of adenoid cystic carcinomas having occurred in
the buccal mucosa were reported. For both cases, long-term follow-ups
were carried out, which are essential for monitoring signs of recurrence
or distant metastasis.