TY - BOOK AU - Castillo, Cristina Roxanne M., MD. TI - Malignant transformation of a benign tumor vs metastatic lesion : : a case report / AV - ENT20160001 PY - 2016/// CY - Fairview, Quezon City PB - Department of Otolaryngology, FEU-NRMF N1 - Includes appendices and bibliographical references; RESDOT N2 - ABSTRACT: Presented is a case of J.D. a 41 year old male with a left mandibular mass. This patient was initially diagnosed with Ameloblastoma, on the left mandible, which later on recurred and was diagnosed histologically as an Undifferentiated Carcinoma. The patient was apparently well after the mandibulectomy with reconstruction using titanium plate 1 ½ months prior to the recurrence the tumor. Until, he presented again with a similar but rapidly growing mandibular mass, on the ipsilateral side now accompanied with intermittent pain and an ulcerating alveolar mass. A tissue biopsy of the mass was done with a final histopathologic report of Undifferentiated Carcinoma ER -