Usefulness of MR imaging for odontogenic tumors
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REVIEW ARTICLE
Usefulness of MR imaging for odontogenic tumors Tohru Kurabayashi1 · Naoto Ohbayashi1 · Junichiro Sakamoto1 · Shin Nakamura1 Received: 30 July 2020 / Accepted: 27 September 2020 © The Society of The Nippon Dental University 2020
Abstract MRI has become an invaluable diagnostic tool in all areas of the body. However, it has not been widely used to image odontogenic tumors of the jaw. Major advantages of MRI include excellent soft tissue contrast in the absence of ionizing radiation. Furthermore, diffusion-weighted MRI and dynamic contrast-enhanced MRI can be used as functional imaging techniques for assessing tissue biology. In this review article, we present representative MR images of several types of odontogenic tumors, and discuss MR imaging characteristics useful for differential diagnosis. Keywords MRI · Jaws · Odontogenic tumor · Diagnostic imaging · Differential diagnosis
Introduction A variety of tumors of odontogenic origin occur in the mandible and maxilla. The differential diagnosis of these tumors is essential for treatment planning, and imaging plays an important role in this process. In recent years, computed tomography (CT) has been widely used to image odontogenic tumors of the jaw, and has proved effective not only in evaluating their extent but also in establishing the differential diagnosis. Although MRI has not been routinely applied to odontogenic tumors of the jaw, it can clearly show the contents of such lesions because of its excellent soft tissue resolution. In addition to conventional MRI, diffusionweighted MRI (DWI) and dynamic contrast-enhanced MRI (DCE-MRI) can be used as functional imaging techniques for assessing tissue biology. In particular, DWI, which quantifies the random motion of water molecules in tissues as the apparent diffusion coefficient (ADC), is reported to be useful in characterizing cystic masses of the jaw [1–3]. In this review article, we present representative MR images of several types of odontogenic tumors, and discuss MR imaging characteristics useful for the differential Tohru Kurabayashi and Naoto Ohbayashi contributed equally to the work. * Tohru Kurabayashi [email protected] 1
Oral and Maxillofacial Radiology, Graduate School, Tokyo Medical and Dental University, 1‑5‑45 Yushima, Bunkyo‑ku, Tokyo 113‑8549, Japan
diagnosis. The MR images were all obtained using a 3-T MR scanner (Magnetom Spectra, Siemens Healthcare, Erlangen, Germany). The MR protocols for odontogenic tumors in our dental hospital are summarized in Table 1.
MR imaging characteristics of odontogenic tumors Ameloblastoma On the basis of clinical and histopathological findings, ameloblastomas are classified into several types. According to the 2005 WHO classification, ameloblastomas were classified into four types: solid/multicystic, unicystic, desmoplastic and peripheral [4]. Among them, solid/multicystic type, mural variant of unicystic type and desmoplastic type are included in the so-called “ameloblastoma (conventional type)” in the latest WHO classification of 201
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