Introduction
Adenoid cystic carcinoma (ACC) is a rare malignancy predominantly affecting salivary glands, characterized by heterogeneous histopathologic features including tubular, cribriform, and solid components. ACC is known for its indolent yet relentless clinical course marked by frequent local recurrences, perineural invasion, and late distant metastases. Despite pathological classifications developed over decades, challenges persist in establishing standardized grading systems due to the morphological complexity and coexistence of different histologic patterns within single tumors.
