AOT will be also detected by the 1st and 2nd
steps. The solid type will be identified by the 1st step, and the type involving one large cyst will be identified by the 2nd step. As for KCOT, most cases will be categorized as [high SI] in the 3rd step. Some cases will be identified as [low SI] in the 3rd step and then will be categorized as [flat] in the 4th step. Although KCOT can be detected by these two steps, a lesion is likely to be a KCOT when it is classified as [high SI] in the 3rd step. Although some DC will be categorized as [high SI] in the 3rd step, most cases will be defined as [low SI] in the 3rd step and then will be detected as [flat] in the 4th step. Thus, a lesion will be categorized as a DC when it is classified as [low SI] in www.selleckchem.com/TGF-beta.html the 3rd step and [flat] in the 4th step. SBC will be categorized as [gradual increase] in the 4th step. We consider that only SBC can be categorized in the 4th step [18]. Although ameloblastomas and AOT will be diagnosed as tumors, differentiation of the two lesions can be difficult [17] and [28]. Similarly, KCOT can be difficult to distinguish from DC [15] and [17]. As for the unicystic type of ameloblastoma, when
a cyst wall with a small intraluminal nodule projecting into the cystic cavity is selleck compound detected on CE-T1WI, they can be distinguished from AOT [13] and [17]. In clinical imaging diagnosis, radiography is always performed before MRI. Since AOT contain a tooth and small calcific substances, their characteristic findings can be observed on radiographs. Moreover, Chlormezanone as DC are characterized by the presence of the crown
of an unerupted tooth, they can be diagnosed comparatively easily by radiography. Various combinations of lesions are often difficult to differentiate by radiography, e.g., it is difficult to differentiate among ameloblastoma, KCOT, and SBC, and between AOT and DC. Our MR imaging diagnostic protocol is expected to be able to distinguish each of these combinations. Therefore, if our MR imaging diagnostic protocol and radiographic diagnosis are combined, highly accurate diagnostic imaging is possible. Although we did not include radicular cyst in this review, we have also previously investigated the MR imaging features of radicular cyst [15]. The cystic cavity of radicular cyst showed homogenous low SI on T1WI in 9 of 10 cases, homogenous markedly high SI on T2WI in 8 of 10 cases, and no enhancement in all 7 cases. The cyst border showed thin rim enhancement in 6 of 7 cases and thick rim enhancement in remaining one case. In MR imaging features, radicular cyst showing thick rim enhancement is similar to the type involving one large cyst of AOT. Therefore, it may be difficult to distinguish both by MRI. However, the each radiographical feature is characteristic finding enough to distinguish between them.