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Related Concept Videos

Computed Tomography01:10

Computed Tomography

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
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Related Experiment Video

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Role of Diffusion MRI Tractography in Endoscopic Endonasal Skull Base Surgery
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Transsphenoidal Optic Canal Decompression for Traumatic Optic Neuropathy Assisted by a Computed Tomography Image

J Li1, Q S Ran2, B Hao1

  • 1Department of Ophthalmology, Daping Hospital, Army Medical University, Chongqing 400042, China.

Journal of Ophthalmology
|August 28, 2020
PubMed
Summary

Endoscopic transsphenoidal optic canal decompression (ETOCD) offers a less invasive option for traumatic optic neuropathy (TON). This technique, aided by CT imaging, showed improved vision in over half of patients with minimal complications.

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Area of Science:

  • Neurosurgery
  • Ophthalmology
  • Medical Imaging

Background:

  • The endoscopic transethmoidal approach for optic nerve decompression is effective but risks iatrogenic trauma.
  • The proximity of the optic nerve to the sphenoid sinus and Onodi cell necessitates careful surgical consideration.
  • Variability in sphenoid sinus anatomy presents challenges in identifying the optic canal during surgery.

Purpose of the Study:

  • To evaluate the efficacy and safety of endoscopic transsphenoidal optic canal decompression (ETOCD) as a less invasive alternative.
  • To utilize CT postprocessing for precise identification of the optic canal and related structures.
  • To investigate optimal decompression strategies by analyzing optic canal dimensions.

Main Methods:

  • Performed ETOCD, a less invasive endoscopic technique, to decompress the optic canal.
  • Employed CT postprocessing to identify the optic nerve and internal carotid artery positions.
  • Measured optic canal dimensions, including length and wall thickness, to guide surgical technique.

Main Results:

  • Visual acuity improved in 59.1% of patients (13 out of 22).
  • No serious surgical complications were reported.
  • The medial wall of the optic canal was longest, and its middle section was narrowest, suggesting targeted decompression may suffice.

Conclusions:

  • ETOCD is a feasible, safe, and effective approach for traumatic optic neuropathy (TON).
  • CT postprocessing significantly aids in intraoperative optic canal recognition.
  • Surgical decompression may not require complete removal of the medial optic canal wall, particularly near the cranial opening.