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Complex odontoma associated with dentigerous cyst in maxillary sinus: case report and computed tomography features

¹Department of Radiology, College of Dentistry, University of São Paulo, Lauro Wanderley Hospital, Federal University of Paraiba, João Pessoa, PB, Brazil; ²Department of Radiology, College of Dentistry, University of São Paulo, Brazil; ³Department of Radiology, College of Medicine, University of Iowa, Iowa City, USA

*Correspondence to: Dr Marcelo Cavalcanti, University of São Paulo, Faculty of Odontology, Department of Radiology, Av. Prof. Lineu Prestes 2227, São Paulo, SP 05508-900, Brazil. E-mail: mgpcaval{at}usp.br

Received 25 September 2007; revised 24 December 2007; accepted 8 January 2008

Tumoural and cystic lesions are common findings in the daily practice of dental professionals and maxillofacial radiologists. However, simultaneous lesions are rare and represent a diagnostic challenge to overcome. Among tumoural pathologies, odontomas are the most common odontogenic tumour of the jaws. Cystic transformation or development from the tumoural capsule are well recognized in situations such as ameloblastomas originated from a dentigerous cyst. Otherwise, despite literature reports, dentigerous cysts arising from odontomas are very rare and could lead to misdiagnosis. Here, we report a case of a complex odontoma associated with a dentigerous cyst in the maxillary sinus, focussing on the tomographic features and a differential imaging approach to the diagnosis of these lesions.

Keywords: odontogenic tumour, cysts, computed tomography