Abstract
Polymorphous low grade adenocarcinoma (PLGA) is a low grade malignant neoplasm mostly arising in the palate. We report a case of PLGA in the oral floor of a 60-year old man. He had an indolent tumor in the oral floor on the right side for about 30 years. Oral examination revealed a 4cm hard mass without mucosal ulceration. Since the tumor was thought to be benign, it was enucleated in the first surgery. Histological diagnosis was PLGA, as the tumor showed an infiltrative growth pattern without a capsule and a broad spectrum of architectural morphology including solid, tubular and cystic patterns. After the diagnosis of PLGA, an additional removal of the oral floor tissue and a dissection of the submandibular region on the right side were performed as the second surgery. The tumor has not recurred or metastasized in 6 months of follow-up, but close observation will continue.
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