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Background and Objectives:Organizing hematoma of the maxillary sinus can be developed by organizing procedure of hematoma in the unaerated maxilary sinus. To our knowledge, this is the second article describing organizing hematoma in the maxillary sinus. We experienced 7 cases recently, and aimed to describe clinical features, radiologic characteristics, and Materials and Methods:Seven patients were diagnosed as organizing hematoma pathologically. We reviewed computed tomography (CT) and medical records to find out clinical features of organizing hematoma of the max-illary sinus. Of seven patients, five were male and two were female. Their mean age was 49 years. Results:All patients had a history of frequent epistaxis without bleding tendency. They also complained of nasal obstruction, hyposmia, headache, nsities expanding the maxillary sinus with the minimal contrast enhancement. Destruction of the bony wall was observed in two patients. Endoscopic sinus surgery, Caldwell-Lucs operation, and Denkers operation were applied for the treatment singly or in combination, and resulted in successful outcome. Conclusion:Organizing hematoma should be included in the differ-ential diagnosis when patients have frequent epistaxis and expansile lesion in the maxillary sinus. (Korean J Otolaryngol 2002;45:245-8)