Chronic otitis media and middle ear variants: Is there relation?

Figure 1 Koerner’s septum in axial computed tomography image and illustration. A: Axial computed tomography image shows Koerner’s septum (KS) as a thicker bone lamina in mastoid process (red arrow); B: KS is seen in illustration.

Figure 2 Labyrinth segment of facial canal without a bonny canal coverage in axial computed tomography image and illustration. A: Axial computed tomography image shows that there is not a bonny canal coverage around the labyrinth segment of facial nerve (red arrow); B: In this illustration labyrinth segment of facial canal can be seen without a bonny canal coverage.

Figure 3 Axial computed tomography image and illustration. A: Axial computed tomography image shows that the roof of the jugular bulb (red arrow) is much higher than the basal turn of cochlea (yellow arrow); B: Illustration of middle ear cavity in coronal plane show jugular bulb colored as blue is slightly higher than the basal turn of cochlea; C: Axial computed tomography image shows that there is not a bone roof above jugular bulb and it is in direct contact with middle ear cavity (red arrow), tympanic membrane; D: When comparing with B we cannot see the bonny roof of jugular bulb.

Figure 4 Jugular bulb diverticulum. A: Axial computed tomography image shows jugular bulb diverticulum as an outpouching from tiny bulbus (red arrow); B: Illustration draw of jugular bulb diverticulum which out pouches to middle ear cavity.

Figure 5 Anteriorly located sigmoid sinus. A: Anteriorly located sigmoid sinus. On axial CT images shows a sigmoid sinus very close to outer ear (red arrow); B: Illustration demonstrates anteriorly located sigmoid sinus.