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Computed Tomography01:10

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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.
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Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT01:25

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Calcium-Scoring CT ScanA calcium-scoring CT scan, also known as coronary artery calcium (CAC) scan, detects calcium deposits in the coronary arteries. This test assesses the risk of coronary artery disease (CAD), which can lead to cardiovascular events such as angina, heart failure, and sudden cardiac arrest.A calcium-scoring CT scan is generally recommended for individuals at intermediate risk of CAD without symptoms. It includes:Men aged 40-75 and women aged 50-75: Especially those with a...
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Radiological Investigation I: X-ray and CT01:30

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Radiological investigations, including X-rays and computed tomography (CT) scans, are critical for diagnosing and evaluating various medical conditions. These imaging techniques provide valuable insights into the body's internal structures, aiding in the detection of abnormalities, assessment of disease progression, and development of treatment strategies. This article delves into two primary radiological investigations, chest X-rays and CT scans, outlining their purpose, procedures, and...
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Imaging Studies for Cardiovascular System V: CT01:28

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X-ray Imaging01:24

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German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
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Imaging Studies I: CT and MRI01:14

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Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
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Updated: Jun 7, 2025

Author Spotlight: Developing a Bedside Protocol for Kidney and Genitourinary Ultrasonography
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Author Spotlight: Developing a Bedside Protocol for Kidney and Genitourinary Ultrasonography

Published on: June 21, 2024

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Undetectable renal stone on computed tomography.

Guanghan Zhang1, Zhicong Huang1, Shaoying Li2

  • 1Department of Urology and Guangdong Key Laboratory of Urology, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, 510230, China.

Urology Case Reports
|November 19, 2024
PubMed
Summary
This summary is machine-generated.

Noncontrast computed tomography (CT) is standard for diagnosing kidney stones. However, this case highlights a surgical adhesive renal stone undetectable by CT, posing diagnostic challenges.

Keywords:
CTN-butyl α-cyanoacrylateNephrolithiasisSurgical adhesive

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Area of Science:

  • Nephrology
  • Radiology
  • Materials Science

Background:

  • Noncontrast computed tomography (CT) is the primary imaging modality for suspected renal calculi.
  • Accurate diagnosis of renal stones is crucial for timely intervention and management.

Observation:

  • A case is presented where a renal stone was not detected by noncontrast CT.
  • The patient presented with symptoms suggestive of renal lithiasis.

Findings:

  • The unidentified renal stone was composed of n-butyl α-cyanoacrylate.
  • This material is a surgical adhesive frequently employed during partial nephrotomy procedures.

Implications:

  • This finding challenges the universal diagnostic utility of CT for all types of renal stones.
  • Highlights the need for considering iatrogenic causes and alternative diagnostic methods when CT is negative.
  • Suggests potential for surgical adhesives to form radiolucent calculi, impacting patient care.