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

Assessment of the Rectum and Anus01:25

Assessment of the Rectum and Anus

1.3K
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,...
1.3K
Imaging Studies I: CT and MRI01:14

Imaging Studies I: CT and MRI

901
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.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
901
What is Variation?01:14

What is Variation?

18.6K
Apart from the measures of central tendency, distribution, outliers, and the changing characteristics of data with time, an important characteristic of any data set is its variation or spread. In some data sets, the data values are concentrated closely near the mean; in others, the data values are more widely spread out from the mean.
The range, standard deviation, standard error, and variance are the different measures of variation.
Range: The range is the difference between its maximum and...
18.6K
Variation01:19

Variation

8.0K
An important characteristic of any set of data is the variation in the data. In some data sets, the data values are concentrated closely near the mean; in other data sets, the data values are more widely spread out from the mean. The most common measure of variation, or spread, is the standard deviation, which is the square root of variance.
When independent and dependent variables are plotted on a scatter plot, the slope of a line is a value that describes the rate of change between the two...
8.0K
Conservative Site-specific Recombination and Phase Variation02:53

Conservative Site-specific Recombination and Phase Variation

6.8K
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
6.8K
Variation of Atmospheric Pressure01:18

Variation of Atmospheric Pressure

4.2K
Change in atmospheric pressure with height is particularly interesting. The decrease in atmospheric pressure with increasing altitude is due to the decreasing gravitational force per unit area as we move away from the surface of the earth.
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
Let p(y) be the atmospheric pressure at...
4.2K

You might also read

Related Articles

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

Sort by
Same author

Global strategies for the diffusion of robotic surgery.

Arquivos brasileiros de cirurgia digestiva : ABCD = Brazilian archives of digestive surgery·2025
Same author

ASO Author Reflections: The Paradox of Surgery for Pseudomyxoma Peritonei of Appendiceal Origin-Sometimes the Most Extensive Operations for Histologically Bland Disease.

Annals of surgical oncology·2024
Same author

Surgical approach for the laparoscopic-assisted Altemeier procedure - A video vignette.

Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland·2022
Same author

Introduction of an integrated primary care faecal immunochemical test referral pathway for patients with suspected colorectal cancer symptoms.

Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland·2022
Same author

Faecal immunochemical testing (FIT) in patients with signs or symptoms of suspected colorectal cancer (CRC): a joint guideline from the Association of Coloproctology of Great Britain and Ireland (ACPGBI) and the British Society of Gastroenterology (BSG).

Gut·2022
Same author

The current state of use of the faecal immunochemical test in symptomatic patients in the UK: A survey of ACPGBI members.

Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland·2022
Same journal

Prognostic impact of anal cancer morphology on survival and local recurrence: A 20-year regional cohort study.

Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland·2026
Same journal

Rethinking lymphadenectomy in the immunotherapy era of colorectal cancer: A hypothesis-generating perspective.

Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland·2026
Same journal

Transanal minimally invasive surgery for rectal GIST-A video vignette.

Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland·2026
Same journal

The relational core of nurse-led LARS care: Recognising an active therapeutic mechanism and building sustainable pathways.

Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland·2026
Same journal

Outcomes reported in comparative studies of surgical management of pilonidal disease: Systematic review to inform a core outcome set.

Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland·2026
Same journal

Robotic and transperineal endoscopic en bloc resection for rectal cancer with a rectovaginal fistula: Vaginal-wall fistula closure-A video vignette.

Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland·2026
See all related articles

Related Experiment Video

Updated: Feb 5, 2026

Author Spotlight: Learning Systematic Bronchoscopy in a Simulation-Base Setting
04:47

Author Spotlight: Learning Systematic Bronchoscopy in a Simulation-Base Setting

Published on: June 23, 2023

3.5K

Variation in landmarks for the rectum: an MRI study.

N D'Souza1,2,3, S Balyasnikova1,3,4, V Tudyka5

  • 1Royal Marsden Hospital, Sutton, UK.

Colorectal Disease : the Official Journal of the Association of Coloproctology of Great Britain and Ireland
|September 4, 2018
PubMed
Summary
This summary is machine-generated.

Magnetic Resonance Imaging (MRI) bony landmarks are unreliable for identifying the rectosigmoid junction. The sigmoid take-off provides a more accurate, patient-specific anatomical landmark for surgical planning.

Keywords:
anatomycolorectal cancermagnetic resonance imagingrectumsigmoid

More Related Videos

Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study
07:30

Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study

Published on: August 18, 2020

7.8K
Author Spotlight: Demonstrating Systematic Endobronchial Ultrasound to New Endoscopists
05:22

Author Spotlight: Demonstrating Systematic Endobronchial Ultrasound to New Endoscopists

Published on: August 11, 2023

2.8K

Related Experiment Videos

Last Updated: Feb 5, 2026

Author Spotlight: Learning Systematic Bronchoscopy in a Simulation-Base Setting
04:47

Author Spotlight: Learning Systematic Bronchoscopy in a Simulation-Base Setting

Published on: June 23, 2023

3.5K
Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study
07:30

Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study

Published on: August 18, 2020

7.8K
Author Spotlight: Demonstrating Systematic Endobronchial Ultrasound to New Endoscopists
05:22

Author Spotlight: Demonstrating Systematic Endobronchial Ultrasound to New Endoscopists

Published on: August 11, 2023

2.8K

Area of Science:

  • Radiology
  • Anatomy
  • Gastroenterology

Background:

  • Accurate identification of the rectosigmoid junction is crucial for surgical procedures and staging of pelvic cancers.
  • Current methods using arbitrary measurements or bony landmarks on MRI have shown limitations in precisely defining this anatomical transition.

Purpose of the Study:

  • To evaluate the reliability of existing metric measurements and bony landmarks for determining the rectosigmoid junction on MRI.
  • To compare these conventional landmarks against actual anatomical bowel segments.

Main Methods:

  • Retrospective review of 100 patient MRI scans.
  • Identification of the rectum and sigmoid based on the mesorectum and mesocolon junction.
  • Comparison of anatomical segments with measurements from the anal verge and bony landmarks (sacral promontory, third sacral segment).

Main Results:

  • The mean sigmoid take-off distance from the anal verge was 12.6 cm.
  • At 12 cm from the anal verge, 35% of patients had sigmoid colon, not rectum.
  • Bony landmarks like the sacral promontory and third sacral segment identified sigmoid colon in 28% and 100% of patients, respectively.

Conclusions:

  • Arbitrary measurements and bony landmarks are inadequate for accurately locating the rectosigmoid junction in most patients.
  • The sigmoid take-off serves as a more reliable, anatomically tailored landmark for defining the rectosigmoid junction on MRI.