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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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Pre-lacrimal window maxillary sinus surgery: a computed tomography analysis and classification.

Mohammad Waheed El-Anwar1, Mohamed Kamel Alawady2, Mohamed Alshawadfy1

  • 1Department of Otorhinolaryngology-Head and Neck Surgery, Faculty of Medicine, Zagazig University, Zagazig, Egypt.

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Summary

The pre-lacrimal window (PLW) approach offers access to maxillary sinus lesions. This study measured computed tomography (CT) dimensions of the PLW, finding average widths and angles to aid surgical planning.

Keywords:
EndoscopyMaxillary sinusNasolacrimal duct

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Area of Science:

  • Otolaryngology
  • Endoscopic Sinus Surgery
  • Medical Imaging

Background:

  • The pre-lacrimal window (PLW) approach is a valuable technique for accessing difficult-to-reach maxillary sinus lesions.
  • Understanding the anatomical dimensions of the PLW is crucial for its effective utilization in surgical procedures.

Purpose of the Study:

  • To determine the computed tomography (CT) dimensions, measurements, and grading of the pre-lacrimal window (PLW).
  • To provide quantitative data on PLW anatomy for improved surgical planning and application.

Main Methods:

  • Analysis of 100 paranasal CT scans, including axial, coronal, and sagittal reformats.
  • Measurement of PLW width, nasolacrimal duct (NLD) width, and the angle between the NLD axis and the hard palate.
  • Grading of these anatomical parameters.

Main Results:

  • Mean PLW width was 5.6± 2.4 mm (range, 0-11.15 mm).
  • Mean NLD width was 6.38± 1.84 mm (range, 1-11 mm).
  • Mean angle between NLD axis and hard palate was 68.6°± 6.77° (range, 54°-83°).
  • No significant differences were observed between sides or genders for any measurements.

Conclusions:

  • CT dimensions of the PLW require careful evaluation for endoscopic approaches to the maxillary sinus.
  • This study enhances awareness of PLW measurements and variations among surgeons and radiologists.
  • Improved understanding of PLW anatomy can optimize the application of the PLW approach.