Magnetic resonance imaging assessment of tumorous lesions in the floor of the mouth: case reports and review of the literature

Ariji, Yoshiko; Gotoh, Masakazu; Naitoh, Munetaka; Izumi, Mitsuru; Shimozato, Kazuo; Kurita, K.; Maeda, Hideaki; Ariji, Eiichiro

doi:10.1007/s11282-006-0040-0

Cited by 7 publications

(10 citation statements)

References 33 publications

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“…US is the first choice because of its feasibility, low cost and efficacy (4). Together with MRI it presents better tecidual resolution when compared with computed tomography (8,9). In general, these cysts can be visualized as a well-defined mass with homogenous internal structures and a welloutlined cystic wall (7,8).…”

Section: Discussionmentioning

confidence: 99%

“…Together with MRI it presents better tecidual resolution when compared with computed tomography (8,9). In general, these cysts can be visualized as a well-defined mass with homogenous internal structures and a welloutlined cystic wall (7,8). Some authors consider MRI superior to other methods, since it shows the exact position, extension and demarcation of dermoid cysts (2,4,10).…”

Section: Discussionmentioning

confidence: 99%

“…With this exam, different slices and plans of the region in question can be obtained since the sagittal image is extremely important for the positioning of medial tumors and the diagnosis of benign cystic lesions (2,4,10). With MRI, the epidermoid cyst is described as a cystic mass, which is hypointense in T1-weighted images and hyperintense in T2-weighted images (5,8,10). The intensity of the signal varies according to the ratio of keratin (protein) to cholesterol (lipid) (8).…”

Section: Discussionmentioning

confidence: 99%

“…With MRI, the epidermoid cyst is described as a cystic mass, which is hypointense in T1-weighted images and hyperintense in T2-weighted images (5,8,10). The intensity of the signal varies according to the ratio of keratin (protein) to cholesterol (lipid) (8). A lipid material shows high intensity on both T1 and T2-weighted images, whereas a material with keratin shows a low to intermediate intensity on T1-weighted images and intermediate to high intensity on T2-weighted images (8).…”

Section: Discussionmentioning

confidence: 99%

“…The intensity of the signal varies according to the ratio of keratin (protein) to cholesterol (lipid) (8). A lipid material shows high intensity on both T1 and T2-weighted images, whereas a material with keratin shows a low to intermediate intensity on T1-weighted images and intermediate to high intensity on T2-weighted images (8). Considering the large amount of keratin in our case, the signal was low intensity on T1-weighted images and high intensity on T2-weighted images.…”

Section: Discussionmentioning

confidence: 99%

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Epidermoid cyst: highlights on diagnosis and magnetic resonance imaging features

Elias¹,

Oton-Leite²,

Silva³

et al. 2010

Rev. odonto ciênc. (Online)

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Purpose: Epidermoid and dermoid cysts are extremely rare developmental cysts of a benign nature, which may occur anywhere in the body, although about 7% are found in the head and neck. This article reports a clinical case of a patient who had an epidermoid cyst and its magnetic resonance imaging (MRI) features.Case report: This case discusses an epidermoid cyst in a 36-year-old woman complaining about speech difficulty. Clinical examination revealed an extensive swelling on the floor of the mouth. MRI findings showed a cystic homogenous lesion located underneath the mylohyoid muscle which was removed by surgery. Histological examination of the mass confirmed the diagnosis of an epidermoid cyst.Conclusion: We concluded that MRI was considered useful for a more accurate diagnosis prior to treatment.Key words: Epidermoid cyst; dermoid cyst; magnetic resonance images; differential diagnosis ResumoProposta: Cistos epidermóide e dermóide são cistos de desenvolvimento extremamente raros, de natureza benigna, que podem ocorrer em qualquer região do corpo e somente 7% são encontrados na região de cabeça e pescoço. Este artigo apresenta o caso clínico de uma paciente que possuía um cisto epidermóide juntamente com as características das imagens por ressonância magnética.Descrição do caso: Paciente do gênero feminino, 36 anos, apresentou-se com queixa de dificuldade de fonação e deglutição. O exame clínico intrabucal revelou uma extensa tumefação em soalho bucal. As imagens por ressonância magnética indicaram uma lesão de natureza cística, homogênea, de conteúdo sólido e localizada abaixo do músculo milohiódeo. A lesão foi enucleada e encaminhada para exame anatomopatológico, cujo diagnóstico foi compatível com cisto epidermóide.Conclusão: A imagem por ressonância magnética foi essencial para determinar as características da lesão de acordo com a sua localização anatômica.Palavras-chave: Cisto epidermóide; cisto dermóide; imagens por ressonância magnética; diagnóstico diferencial. Case ReportRev. odonto ciênc. 2010;25(2): [204][205][206][207] 205 Elias et al.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Epidermoid cyst: highlights on diagnosis and magnetic resonance imaging features

Elias¹,

Oton-Leite²,

Silva³

et al. 2010

Rev. odonto ciênc. (Online)

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Utility of re-windowing for MR T2-weighted images in differentiating between benign tumors and cysts

et al. 2009

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Objectives Both benign tumors and cysts in the oral and maxillofacial region show clear borders and homogeneously high signal intensity on magnetic resonance (MR T2-weighted images, making differentiation difficult without contrast enhancement. Windowing for brightness and contrast adjustment may be helpful in interpreting relative signal intensities on MR images. This study was performed to determine whether re-windowing against targeted lesions on T2-weighted images was a useful procedure that would enhance differentiation without invasive contrast enhancement. Methods Twenty-six lesions (13 benign tumors, 13 cysts) that showed clear borders and homogeneously high signal intensity on T2-weighted images were examined. The windowing parameters of axial images were readjusted to emphasize contrast only inside the lesions using automatic density adjustment. Re-windowed images were reviewed by three experienced oral radiologists and categorized based on the internal homogeneity of the lesion into four grades: 0, heterogeneous; 1, slightly heterogeneous; 2, slightly homogeneous; 3, homogeneous. Re-windowing was then evaluated for its usefulness in differentiating between benign tumors and cysts. Results For cysts, the rates of homogeneous (grades 3 and 2) and heterogeneous intensity (grades 1 and 0) were 66.7 (26/39) and 33.3% (13/39), respectively. For benign tumors, these rates were 33.3 (13/39) and 66.7% (26/39), respectively. Cysts showed a higher rate of homogeneous intensity, while the opposite was true for benign tumors. A significant difference in distribution was observed between cysts and benign tumors (P \ 0.01, v 2 test). Conclusion Re-windowing for T2-weighted images is helpful in differentiating between benign tumors and cysts with clear borders and homogeneously high signal intensity on T2-weighted images.

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Peripheral Ossifying Fibroma in the Oral Cavity: MRI Findings

Chaudhari

Umarji²

2011

Case Reports in Dentistry

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The peripheral ossifying fibroma, a benign gingival overgrowth, occurs mainly in the anterior portion of the maxilla in young adults. The size of the lesion is usually less than 1.5 cm. We report a case of peripheral ossifying fibroma overlying the mandibular alveolar ridge of a 55-year-old female. MR scans showed a large exophytic soft tissue mass overlying mandibular alveolar ridge. The tumor revealed peripheral calcifications with slight erosion of adjacent cortical plate.

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Magnetic resonance imaging assessment of tumorous lesions in the floor of the mouth: case reports and review of the literature

Cited by 7 publications

References 33 publications

Epidermoid cyst: highlights on diagnosis and magnetic resonance imaging features

Epidermoid cyst: highlights on diagnosis and magnetic resonance imaging features

Utility of re-windowing for MR T2-weighted images in differentiating between benign tumors and cysts

Peripheral Ossifying Fibroma in the Oral Cavity: MRI Findings

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