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Related Concept Videos

Positron Emission Tomography01:29

Positron Emission Tomography

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Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body...
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Radiological Investigation III: Pulmonary Angiogram and PET Scan01:13

Radiological Investigation III: Pulmonary Angiogram and PET Scan

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Radiological investigations are paramount in the diagnosis and management of various pulmonary diseases. Two essential investigations are the Pulmonary Angiogram and the Positron Emission Tomography (PET) Scan.
Pulmonary Angiogram
A Pulmonary Angiogram is an invasive procedure involving injecting a contrast medium through a catheter threaded into the pulmonary artery or the right side of the heart to visualize the pulmonary vasculature. Computed Tomography (CT) scans have mainly replaced this...
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Imaging Studies II: Positron Emission Tomography and Scintigraphy01:25

Imaging Studies II: Positron Emission Tomography and Scintigraphy

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Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
Fundamental Principles of PET
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Assessment of the Rectum and Anus01:25

Assessment of the Rectum and Anus

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Evaluating the rectum and anus plays a crucial role in conducting a thorough physical examination of the gastrointestinal system. Although it may be uncomfortable and often embarrassing for the patient, it holds immense diagnostic value, particularly in detecting gastrointestinal diseases and abnormalities. This guide will explain how to perform this assessment using inspection and palpation methods.
Rectal Inspection
Begin by inspecting the perianal and anal areas for color, texture, rashes,...
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Endoscopic Procedures II: Colonoscopy01:25

Endoscopic Procedures II: Colonoscopy

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The colon, or large intestine, is the final segment of the digestive system. Its primary functions include absorbing water and vitamins produced by gut bacteria and transforming waste from liquid to solid to form stool. In adults, the large intestine is approximately 5 feet long and consists of four main sections:
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Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy01:26

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy

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This lesson explores three gastrointestinal imaging techniques: radionuclide testing, colonic transit studies, and virtual colonoscopy.
Radionuclide Testing
Radionuclide testing is a sophisticated medical technique for assessing gastrointestinal motility. It focuses on gastric emptying and colonic transit time. Radioactive markers track the movement of food through the digestive system, providing insights into gastrointestinal disorders.
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[Rectal bleeding after positron emission tomography].

Céline Aubry1, Marie Méan1, Christel Hermann Kamani2,3,4

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Summary
This summary is machine-generated.

This case highlights potential gastrointestinal bleeding risks associated with 18F-FDG PET-CT scans in patients with cirrhosis and bleeding disorders. Careful patient selection and protocol adherence are crucial.

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Area of Science:

  • Gastroenterology
  • Radiology
  • Internal Medicine

Background:

  • A 60-year-old male with alcoholic cirrhosis and bleeding risks was hospitalized for gallstone cholangitis.
  • The patient experienced upper gastrointestinal bleeding after a diagnostic endoscopic retrograde cholangiopancreatography (ERCP).

Purpose of the Study:

  • To report a case of recurrent rectal bleeding following 18F-FDG PET-CT in a patient with cirrhosis and bleeding risk factors.
  • To discuss the potential role of heparin administration during 18F-FDG PET-CT preparation in precipitating bleeding events.

Main Methods:

  • Case report detailing a patient's clinical course, diagnostic procedures, and complications.
  • Review of 18F-FDG PET-CT preparation protocols, including the use of heparin.

Main Results:

  • The patient developed bacteremia, leading to a 18F-FDG PET-CT scan.
  • Post-scan, the patient experienced significant rectal bleeding, raising suspicion for heparin-induced bleeding complications.

Conclusions:

  • Patients with cirrhosis and hemorrhagic risk factors require careful consideration of bleeding risks associated with imaging procedures like 18F-FDG PET-CT.
  • The use of heparin in 18F-FDG PET-CT preparation may warrant further investigation in patients with compromised coagulation.