Usefulness of contrast enhanced-MRI in the diagnosis of unicystic ameloblastoma

Konouchi, Hironobu; Asaumi, Jun Ichi; Yanagi, Yoshinobu; Hisatomi, Miki; Kawai, Noriko; Matsuzaki, Hidenori; Kishi, Kanji

doi:10.1016/j.oraloncology.2005.10.001

Cited by 60 publications

(71 citation statements)

References 6 publications

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“…The latter tumours, which include KCOTs, AOTs, CCOTs and some ameloblastomas, display a cystic appearance with or without solid components. 1,5,11,12 We evaluated odontogenic tumours on MRI by analysing their cystic component uniformity and DCE-MRI parameters.…”

Section: Discussionmentioning

confidence: 99%

“…1 Unicystic ameloblastomas are often devoid of solid components and tend to display a similar appearance to KCOTs on MRI. 12 Regarding the cystic components of ameloblastoma and KCOTs, Minami et al 11 reported that their T 2 relaxation times are useful for differentiating between these two lesions, and Sumi et al 5 reported that the apparent diffusion coefficients of the cystic components of ameloblastomas and KCOTs might be useful for differentiating between them. The cystic components of ameloblastomas usually include serous liquid-containing protein, while those of KCOTs contain desquamated keratin.…”

Section: Discussionmentioning

confidence: 99%

“…Some authors, including us, have previously reported the usefulness of MRI, including dynamic contrast-enhanced MRI (DCE-MRI), for the differential diagnosis of odontogenic tumours. [5][6][7][8][9][10][11][12] However, these previous studies were case reports or comparison studies involving one or a few histopathological types. [5][6][7][8][9][10][11][12] Therefore, the aims of this study were to evaluate the diagnostic value of MRI including DCE-MRI for odontogenic tumours and to establish criteria for their diagnosis.…”

Section: Introductionmentioning

confidence: 99%

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Diagnostic value of MRI for odontogenic tumours

Fujita

Matsuzaki²,

Yanagi

et al. 2013

Dentomaxillofacial Radiology

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Objectives: To evaluate the diagnostic value of MRI for odontogenic tumours. Materials and methods: 51 patients with odontogenic tumours were subjected to preoperative MRI examinations. For tumours with liquid components, i.e. ameloblastomas and keratocystic odontogenic tumours (KCOTs), the signal intensity (SI) uniformity of their cystic components (US) was calculated and then their US values were compared. For tumours with solid components that had been examined using dynamic contrast-enhanced MRI (DCE-MRI), their CI max (maximum contrast index), T max (the time when CI max occurred), CI peak (CI max 3 0.90), T peak (the time when CI peak occurred) and CI 300 (i.e. the CI observed at 300 s after contrast medium injection) values were determined from CI curves. We then classified the odontogenic tumours according to their DCE-MRI parameters. Results: Significant differences between the US values of the ameloblastomas and KCOT were observed on T 1 weighted images, T 2 weighted images and short TI inversion recovery images. Depending on their DCE-MRI parameters, we classified the odontogenic tumours into the following five types: Type A, CI peak . 2.0 and T peak , 200 s; Type B, CI peak , 2.0 and T peak , 200 s; Type C, CI 300 . 2.0 and T max , 600 s; Type D, CI 300 . 2.0 and T max . 600 s; Type E, CI 300 , 2.0 and T max . 600 s. Conclusion: Cystic component SI uniformity was found to be useful for differentiating between ameloblastomas and KCOT. However, the DCE-MRI parameters of odontogenic tumours, except for odontogenic fibromas and odontogenic myxomas, contributed little to their differential diagnosis.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diagnostic value of MRI for odontogenic tumours

Fujita

Matsuzaki²,

Yanagi

et al. 2013

Dentomaxillofacial Radiology

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“…A final confirmatory diagnosis of unicysticameloblastomashould only be done by histological examination of the entire lesion and cannot be made solely on clinical or radiographic grounds.The epithelial lining of a UCA is not always uniformly characteristically distinct and is often lined partly by a nonspecific thin epithelium that may mimics the dentigerous cyst lining [7] . Thus, true nature of the lesion becomes evident only after complete enucleation when the entire specimen is available for microscopy [10] Thus histologically, the minimum criteria for diagnosing a lesion as UCA are the demonstration of a single cystic sac lined by odontogenic (ameloblastomatous) epithelium often seen only in focal areas [15] …”

Section: Introductionmentioning

confidence: 99%

Mural Variant of UnicysticAmeloblastoma

Tyagi¹,

Puri²,

Sharma³

et al. 2014

IOSRJDMS

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“…6 At that time we can easily diagnose these lesions as ameloblastomas because this type of T2-weighted MR image shows a multiple-locus bright high signal intensity corresponding to cystic fluids intermixed with areas of relatively high signal intensity corresponding to the solid portion. [7][8][9] Another is the unilocular cystic type, which shows homogeneously bright high signal intensity on T2WI or STIR reflecting the inner part of the water-like content. Therefore, the latter type is difficult to distinguish from cystic lesions such as keratocystic odontogenic tumors, radicular cysts (residual cysts) and dentigerous cysts, which present as unicystic lesions, on the basis of MR signals only.…”

Section: Introductionmentioning

confidence: 99%

Diagnostic value of dynamic contrast-enhanced MRI for unilocular cystic-type ameloblastomas with homogeneously bright high signal intensity on T2-weighted or STIR MR images

et al. 2011

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Telephone number: +81-86-235-6705 FAX number: +81-86-235-6709 SUMMARY Typical MR images of ameloblastomas on T2-weighted image (WI) or short inversion time inversion-recovery (STIR) show multiple bright high-signal-intensity loci on a high-signal-intensity background. Unilocular cystic-type ameloblastomas show homogeneously bright high signal intensity on T2WI or STIR as a water-like signal intensity. Therefore, it is difficult to distinguish unilocular cystic-type ameloblastoma from other cystic lesions such as keratocystic odontogenic tumors, radicular cysts (residual cysts) and dentigerous cysts only on the basis of MRI signal intensity. In the present study, we evaluated whether contrast-enhanced (CE)-T1WI and dynamic CE-MRI (DCE-MRI) could provide additional information for differential diagnosis in unilocular cystic-type ameloblastoma. Images from 12 cases of suspected unilocular cystic-type ameloblastoma were evaluated in the present study. Of them, 5 had areas suspected of indicating a solid component on T1WI and T2WI (or STIR). Ten had undergone additional CE-T1WI and DCE-MRI. On 5 of 10 cases of CE-T1WI, a tiny enhancement area was detected. On 6 of 10 DCE-images, a time-course enhanced area which was suspected to be a solid component was detected. CE-T1WI was helpful in the diagnosis of ameloblastoma because the tiny enhanced areas were taken to indicate possible solid components. Moreover, the rim-enhancement area on CE-T1WI could be divided into small regions of interest, and some of these showed slightly increased enhancement on DCE-MRI, which was taken to indicate a solid component and/or intramural nodule with focal invasion of ameloblastoma tissue. DCE-MRIs of the 4 remaining cases, which provided no clues to the diagnosis of ameloblastoma in the manner of the above descriptions, showed thicker rim enhancement than odontogenic cysts. Thus, CE-T1WI and DCE-MRI were helpful in the differential diagnosis of unilocular cystic-type ameloblastomas with homogeneously bright high signal intensity on T2WI or STIR.

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Usefulness of contrast enhanced-MRI in the diagnosis of unicystic ameloblastoma

Cited by 60 publications

References 6 publications

Diagnostic value of MRI for odontogenic tumours

Diagnostic value of MRI for odontogenic tumours

Mural Variant of UnicysticAmeloblastoma

Diagnostic value of dynamic contrast-enhanced MRI for unilocular cystic-type ameloblastomas with homogeneously bright high signal intensity on T2-weighted or STIR MR images

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