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Simple bone cyst versus odontogenic keratocyst: differential diagnosis by digitized panoramic radiography

¹ Department of Stomatology, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil; ² Department of Pediatric Dentistry, Orthodontics and Collective Health, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil

*Correspondence to: Osny Ferreira Júnior, Departamento de Estomatologia, Faculdade de Odontologia de Bauru - Universidade de São Paulo, Al. Dr. Octávio Pinheiro Brisolla, 9-75 – V. Universitária, Bauru - SP – CEP 17012-101, Brazil; Email: osnyfjr{at}fob.usp.br

Received 13 November 2003; revised 22 July 2004; accepted 9 August 2004

Objectives: To identify the contour and pixel grey levels of simple bone cyst (SBC) and odontogenic keratocyst (OKC) images that might contribute to differentiating between the two lesions.

Methods: Panoramic radiographs of 32 SBC and 20 OKC were digitized and analysed by six examiners. The contours of the images were classified as indistinct, distinct without a sclerotic border, and distinct with a sclerotic border. The presence or absence of scalloping and the pixel grey levels of the radiolucent part of the images were also determined.

Results: The sclerotic border was more frequent in the OKC, especially in the posterior segment (P=0.0301). The presence of scalloping was more frequent in the superior segment of the SBC (P=0.0295). The pixel values were higher in the OKC than in the SBC images (P=0.00134).

Conclusions: Details about the contour and pixel grey levels of OKC and SBC assist in the diagnosis of these lesions.

Keywords: simple bone cyst; Odontogenic keratocyst; panoramic radiography; digital radiography

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