TY - BOOK AU - Mangoba,Dennis Cristobal S. TI - Ossifying fibroma with secondary aneurysmal bone cyst of the maxillary sinus KW - Fibroma, Ossifying KW - Bone Cysts, Aneurysmal KW - Maxillary Sinus N2 - A case of a 37 year old female with a seven-year history of a huge left-sided maxillary mass is presented. Radiologic and CT findings along with the initial biopsies were suggestive of a Mucocele. Excision of the mass along with a Medial Maxillectomy was performed. The final histopathology is Ossifying Fibroma with a secondary Aneurysmal Bone Cyst. Characteristics of these and similar lesions as well as the surgical approach are discussed ER -