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CT of the Normal Temporal Bone: Comparison of Multi– and Single–Detector Row CT¹

¹ From the Institute of Clinical Radiology (L.J., H.B., M.L., M.R.), Department of Neurology (V.A.), and Department of Oto-Rhino-Laryngology (M.H.), University of Munich, Klinikum Grosshadern, Marchioninistr 15, 81366 Munich, Germany; and Department of Biostatistics, Tulane University, New Orleans, La (S.S.). Received July 29, 2002; revision requested September 20; final revision received June 15, 2004; accepted July 7. Address correspondence to L.J. (e-mail: jaeger@ med.uni-muenchen.de).

View larger version (132K): [in a new window]   Figure 1. Transverse multi-detector row CT scan of a normal left temporal bone. Tympanic membrane (1) runs laterally to the chorda tympani (2). Anterior (3) and posterior (4) crura of the stapes are shown. Canal of the accessory nerve of the posterior ampullary nerve (5) emerges from the posterior wall of the internal auditory canal laterally and leads to the canal of the posterior ampullary nerve (6). Within a distance of approximately 7 mm, both canals merge to one canal (7) leading directly to the posterior ampulla.

View larger version (128K): [in a new window]   Figure 2. Transverse multi-detector row CT scan of a normal left temporal bone. A normal incudomallear articulation (1) is shown. Canal of the lateral ampullary nerve (2) runs from the canal of the superior division of the vestibular nerve (3) to the lateral ampulla (4).

View larger version (94K): [in a new window]   Figure 3. Coronal images reformatted from transverse multi-detector row CT images of a normal left temporal bone. Incudostapedial articulation (1) is shown. Tegmen tympani (2) can be delineated.

View larger version (130K): [in a new window]   Figure 4. Transverse multi-detector row CT scan of a normal left temporal bone. A normal incudomallear articulation (1) is shown. The saccular nerve, a branch of the inferior division of the vestibular nerve runs in its own canal (2) from the fundus of the internal auditory canal to the vestibule. The canal of the accessory nerve of the posterior ampullary nerve (3) and canal of the posterior ampullary nerve (4) emerge from the posterior wall of the internal auditory canal. Both run separately to the posterior ampulla (5).

View larger version (117K): [in a new window]   Figure 5. Coronal images reformatted from transverse multi-detector row CT images of a left temporal bone with dehiscence of the facial nerve canal. Tympanic membrane (1) is located between the tympanic cavity and the external auditory canal. Superior malleal ligament (2) runs from the malleleus head to the tegmen tympani. Oval window (3) is located cranially to the round window (4). A lack of complete cortical canal (dehiscence) of the S2 segment of the facial nerve canal (5) is detected near the oval window.

View larger version (177K): [in a new window]   Figure 6. Transverse multi-detector row CT scan of a normal left temporal bone. The anterior malleal ligament (1) and the posterior incudal ligament (2) are shown, as well as the tensor tympani muscle (3), the S2 segment of the facial nerve (4), and the cochleariform process (5).

View larger version (157K): [in a new window]   Figure 7. Transverse multi-detector row CT scan of a normal right temporal bone. Tympanic membrane (1) shows a funnel-shaped appearance. Osseous spiral lamina of the cochlea (2) runs within the cochlea as a hyperdense structure.

View larger version (181K): [in a new window]   Figure 8. Transverse multi-detector row CT scan of a normal right temporal bone. Anterior malleal ligament (arrow) is shown.

View larger version (110K): [in a new window]   Figure 9. Coronal images reformatted from transverse multi-detector row CT images of a normal right temporal bone. Lateral malleal ligament (1) is shown, as well as tensor tympani tendon (2).

View larger version (149K): [in a new window]   Figure 10. Transverse multi-detector row CT scan of a left temporal bone with variation of the facial nerve canal. Canal of the greater superficial petrosal nerve (1) emerges in the proximal S1 segment of the facial nerve canal (2).

View larger version (131K): [in a new window]   Figure 11a. (a) Coronal image reformatted from transverse multi-detector row CT images of a left temporal bone shows a dehiscence of the superior semicircular canal (arrow). (b) Coronal image parallel to the axis of the superior semicircular canal reformatted from transverse multi-detector row CT images, as in a. A dehiscence of the superior semicircular canal (arrow) is detected.

View larger version (106K): [in a new window]   Figure 11b. (a) Coronal image reformatted from transverse multi-detector row CT images of a left temporal bone shows a dehiscence of the superior semicircular canal (arrow). (b) Coronal image parallel to the axis of the superior semicircular canal reformatted from transverse multi-detector row CT images, as in a. A dehiscence of the superior semicircular canal (arrow) is detected.