Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Appendicitis-I: Introduction01:22

Appendicitis-I: Introduction

745
The appendix, a small, narrow, blind tube extending from the inferior part of the cecum, is widely regarded as a vestigial organ, having lost much of its original function through evolution. Despite its diminished role, the appendix can become inflamed, a condition known as appendicitis.
Etiology: Appendicitis can arise from various causes, primarily rooted in the obstruction of the appendix lumen. Factors contributing to this obstruction include fecal accumulation, lymphoid hyperplasia and, in...
745
Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

7.4K
Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
7.4K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Indolent Abdominal Wall Round Cell Sarcoma With EWSR1-PATZ1 Fusion: A Case Report and Literature Review.

Cureus·2025
Same author

A survey of bridging bone on chest radiography shows a greater than expected prevalence of marginal syndesmophytes.

Acta radiologica (Stockholm, Sweden : 1987)·2024
Same author

Use of downstream stress imaging tests for risk stratification of patients presenting to the emergency department with chest pain and low HEART score.

Open heart·2024
Same author

E-learning Interventions for Quality Improvement Continuing Medical Education-A Scoping Review.

The Journal of continuing education in the health professions·2024
Same author

Impact of Size Thresholds on the Diagnosis of Incidental Adrenal Lesions: A Systematic Review and Meta-Analysis.

Journal of the American College of Radiology : JACR·2023
Same author

Prognostic value of coronary computed tomography angiography compared to radionuclide myocardial perfusion imaging in patients With coronary stents.

Frontiers in cardiovascular medicine·2023

Related Experiment Video

Updated: Sep 28, 2025

Diffusion Tensor Magnetic Resonance Imaging in Chronic Spinal Cord Compression
07:00

Diffusion Tensor Magnetic Resonance Imaging in Chronic Spinal Cord Compression

Published on: May 7, 2019

9.0K

Parallel Line Sign-A New MRI Sign Associated With Chronic Sacroiliitis: Prevalence, Characteristics, and

Timothy L Miao1,2, Shubreet Randhawa1,2, Michael J Roth1,2

  • 1Department of Medical Imaging, St Joseph's Health Care London, London, ON, Canada.

Canadian Association of Radiologists Journal = Journal L'Association Canadienne Des Radiologistes
|March 29, 2022
PubMed
Summary

The parallel line sign (PLS) is linked to chronic sacroiliitis, particularly erosions. Identifying the PLS aids in diagnosing sacroiliitis and avoiding misdiagnosis of fractures.

Keywords:
magnetic resonance imagingparallel line signsacroiliac jointsacroiliitis

More Related Videos

Quantitative [18F]-Naf-PET-MRI Analysis for the Evaluation of Dynamic Bone Turnover in a Patient with Facetogenic Low Back Pain
06:31

Quantitative [18F]-Naf-PET-MRI Analysis for the Evaluation of Dynamic Bone Turnover in a Patient with Facetogenic Low Back Pain

Published on: August 8, 2019

7.4K
Imaging Features of Systemic Sclerosis-Associated Interstitial Lung Disease
04:44

Imaging Features of Systemic Sclerosis-Associated Interstitial Lung Disease

Published on: June 16, 2020

20.3K

Related Experiment Videos

Last Updated: Sep 28, 2025

Diffusion Tensor Magnetic Resonance Imaging in Chronic Spinal Cord Compression
07:00

Diffusion Tensor Magnetic Resonance Imaging in Chronic Spinal Cord Compression

Published on: May 7, 2019

9.0K
Quantitative [18F]-Naf-PET-MRI Analysis for the Evaluation of Dynamic Bone Turnover in a Patient with Facetogenic Low Back Pain
06:31

Quantitative [18F]-Naf-PET-MRI Analysis for the Evaluation of Dynamic Bone Turnover in a Patient with Facetogenic Low Back Pain

Published on: August 8, 2019

7.4K
Imaging Features of Systemic Sclerosis-Associated Interstitial Lung Disease
04:44

Imaging Features of Systemic Sclerosis-Associated Interstitial Lung Disease

Published on: June 16, 2020

20.3K

Area of Science:

  • Radiology
  • Rheumatology
  • Orthopedic Imaging

Background:

  • The sacroiliac joint (SIJ) is a common site for inflammatory arthropathies.
  • Accurate diagnosis of sacroiliitis is crucial for appropriate management.
  • Imaging features of sacroiliitis can sometimes be challenging to interpret.

Purpose of the Study:

  • To establish the existence and prevalence of the parallel line sign (PLS) on SIJ MRI.
  • To characterize the features of the PLS and its association with sacroiliitis.
  • To assess the diagnostic utility of the PLS in differentiating sacroiliitis from other conditions.

Main Methods:

  • Retrospective review of 200 consecutive SIJ MRIs from rheumatology referrals.
  • Evaluation for the presence and characteristics of the PLS.
  • Assessment of established imaging features of sacroiliitis, including bone marrow edema, fatty infiltration, erosions, sclerosis, and ankylosis.

Main Results:

  • The PLS was identified in 11.5% of SIJs, predominantly on the iliac side within the synovial portion.
  • The PLS was invariably associated with at least one imaging feature of sacroiliitis.
  • Presence of the PLS correlated significantly with a higher prevalence and greater extent of SIJ erosions, as well as increased bone marrow edema, fatty infiltration, and sclerosis.

Conclusions:

  • The parallel line sign (PLS) is a distinct MRI finding associated with chronic sacroiliitis.
  • The PLS, particularly its association with erosions, can enhance diagnostic confidence in sacroiliitis.
  • Recognition of the PLS may help prevent misdiagnosis of insufficiency fractures in the SIJ.