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| The CT appearance of some parts of fissura fossa canal in aural region |
| LIU Ying-gang |
| Section of CT/MRI, the Affiliated Hospital of Chifeng, Chifeng College, Chifeng InnerMongolia 024000, China |
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Abstract Objective: To explore normal CT appearances of fissura fossa canal in the aural region. Materials and Methods: Thirty-three normal ears were investigated by axial and sagittal views on multi-slice CT. Results: Both fissura petrotympanica and fissura tympanosquamosa were divided into external and internal parts. The external part of fissura petrotympanica communicated with the internal part and showed a curved linear form. The external part of fissura typanosquamosa approximated a triangular shape in the axial view and corniform shape in the sagittal view. The fissura petrosquamosa of adults showed thread like appearance. All of the three fissuras, the internal fissura tympanosquamosa, fissura petrotympanica and fissura petrosquamosa, showed a transverse Y shape structure. The posterior canal of chorda tmpani in eminence chorda tympani showed short thread form. Fossa of incus included short crus of incus and posterior ligament of incus, the depth was about 1.5 mm, showed a wedge shape in axial view. Stapedius duct connected with facial canal through stapedial nerve duct, it was divided into mastoid segment and eminentia pyramidalis segment, the former approximated a round shape in axial view, and the latter showed an arc-like girdle shape. Conclusion: Sixty-four row spiral CT can disclose fissure fossa canal in the aural region satisfactorily.
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Received: 29 September 2011
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2012, Vol. 23 
