Representative MDCT images of odontogenic masses and the GT (arrows) in cases classified as Group 1.

<p><b>(A)</b> Panoramic MDCT image of an AM case classified as Group 1. <b>(B)</b> Cross sectional MDCT image of Fig 2A. <b>(C)</b> Panoramic MDCT image of an OKC case classified as Group 1. <b>(D)</b> Cross sectional MDCT image of Fig 2C. <b>(E)</b> Panoramic MDCT image of a DC case classified as Group 1. <b>(F)</b> Cross sectional MDCT image of Fig 2E.</p

Type and gender distribution of the 313 masses in this study.

<p>Type and gender distribution of the 313 masses in this study.</p

Relationship between mass size and area of the major axis of continuity on MDCT imaging in AM, DC and OKC cases classified as Group 1 or 2.

<p>In AM (blue diamonds), a strong significant correlation was found between the mass size and the size of the continuity area (r = 0.741, p = 0.0001). In DC (green triangles), a very weak significant correlation was found between the mass size and the size of the continuity area (r = 0.167, p = 0.0028). In OKC (red Xs), there was no correlation between the mass size and the size of the continuity area (r = -0.089, p = 0.557).</p

Continuity of each type of mass with the gubernaculum tract.

<p>Continuity of each type of mass with the gubernaculum tract.</p

Schemes and representative MDCT images of classification into 3 groups based on the presence or absence of continuity between the GT and the top of masses in alveolar bone.

<p><b>(A)</b> Scheme of Group 1, which was defined as cases in which an almost intact GT (asterisk) continues to the top of the mass (star). <b>(B)</b> An MDCT image of a mass classified as Group 1. (<b>C)</b> Scheme of Group 2, which was defined as cases in which an expanded GT (arrow) continues to the top of the mass (star). (<b>D)</b> An MDCT image of a mass classified as Group 2. (<b>E)</b> Scheme of Group 3, which was defined as cases in which the GT is not continuous with the tumor or cyst (star). <b>(F)</b> An MDCT image of a mass classified as Group 3.</p

Odontogenic mass size distribution in the presence or absence of the continuity area.

<p>Odontogenic mass size distribution in the presence or absence of the continuity area.</p

Box-and-whisker diagram of the sizes of the odontogenic masses in cases that do and do not have a continuity area in MDCT images.

<p>Box-and-whisker diagram of the sizes of the odontogenic masses in cases that do and do not have a continuity area in MDCT images.</p

Representative MDCT images of the relationship between odontogenic masses and an expanded GT in cases classified as Group 2.

<p>Bone defect areas in the top of the alveolar bone that include a possibly expanded GT were detected (arrows). <b>(A)</b> MDCT image of an AM case classified as Group 2. <b>(B)</b> MDCT image of an OKC case classified as Group 2. <b>(C)</b> MDCT image of a COC case classified as Group 2. <b>(D)</b> MDCT image of a DC case classified as Group 2.</p

Representative MDCT images of the relationship between non-odontogenic masses and the GT in cases classified as Group 3.

<p>Bone defect areas at the top of the alveolar bone were not detected. <b>(A)</b> MDCT image of an ossifying fibroma case classified as Group 3. <b>(B)</b> MDCT image of a fibroma case classified as Group 3. <b>(C)</b> MDCT image of a nasopalatine duct cyst case classified as Group 3. <b>(D)</b> MDCT image of a simple bone cyst case classified as Group 3. <b>(E)</b> MDCT image of a schwannoma case classified as Group 3.</p