BALKAN MEDICAL JOURNAL, cilt.30, sa.3, ss.333-336, 2013 (SCI-Expanded)
Background: High-grade transformation or dedifferentiation in carcinoma is progression of a low-grade malignant neoplasm to a high-grade carcinoma or poorly differentiated adenocarcinoma. This is rarely observed in adenoid cystic carcinoma of the salivary glands.