Related Experiment Video
Updated: Feb 8, 2026
07:22
Surgical Robot-Assisted Transanal Specimen Extraction Radical Sigmoidectomy Without an Auxiliary Abdominal Incision
Published on: June 13, 2025
943
The Pattern of Defects in Mesorectal Specimens: Is There a Difference between Transanal and Laparoscopic Approaches?
S K Perdawood1, M Warnecke2, M X Bjoern1
11 Department of Surgery, Slagelse Hospital, Slagelse, Denmark.
Summary
Transanal total mesorectal excision (TaTME) shows fewer defects below the peritoneal reflection compared to laparoscopic TME. This study clarifies defect patterns in mesorectal specimens after TaTME versus laparoscopic TME.
Area of Science:
- Colorectal surgery
- Surgical oncology
- Minimally invasive surgery
Background:
- Total mesorectal excision (TME) has advanced from open to minimally invasive techniques.
- Transanal TME (TaTME) addresses challenges in the deep pelvis, gaining recent acceptance.
- TaTME results appear comparable to laparoscopic TME, but defect patterns require clarification.
Purpose of the Study:
- To compare mesorectal defect patterns between TaTME and laparoscopic TME.
- To identify the location of defects, particularly below the peritoneal reflection, in retrieved specimens.
Main Methods:
- Retrospective analysis of 29 patients who underwent TaTME with mesorectal defects.
- Comparison with 29 control patients who underwent laparoscopic TME with defects.
- Systematic review of specimen photos and pathology reports to define defect sites and patterns.
Main Results:
- A higher proportion of defects were located below the peritoneal reflection in the laparoscopic TME group (P=0.043).
- No statistically significant difference in defect distribution by anatomical quadrant was observed between the groups.
Conclusions:
- The ratio of defects below the peritoneal reflection was lower in the TaTME group.
- Further research is needed to determine if this reflects a lower incidence of defects with TaTME.
Keywords:
Mesorectumlaparoscopyrectal cancer surgerytotal mesorectal excisiontransanal total mesorectal excisionMore Related Videos
Related Concept Videos
01:23Lumber Defects
532
Lumber defects, which can affect both the appearance and structural integrity of wood, include a variety of growth and manufacturing flaws. Growth defects such as knots and knotholes occur where branches were once attached to the tree trunk, with knotholes forming when these knots fall out. Other natural defects include decay and insect damage, which compromise the wood's strength and durability.
Shakes are minor fractures that run along or across the wood's annual rings, while wane is...
Shakes are minor fractures that run along or across the wood's annual rings, while wane is...
532
01:16Electric Potential and Potential Difference
5.7K
Suppose a positive test charge moves away from a positive static charge, then the Coulomb force does positive work, and its electric potential energy decreases. The potential energy per unit charge is defined as the electric potential. The electric potential is independent of the test charge.
When a test charge moves from the initial to the final position, the electric potential difference between those positions is defined as the ratio of the change in the potential energy to the charge on the...
When a test charge moves from the initial to the final position, the electric potential difference between those positions is defined as the ratio of the change in the potential energy to the charge on the...
5.7K
01:05Difference from Background: Limit of Detection
8.4K
The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
The LOD indicates the presence or absence...
The LOD indicates the presence or absence...
8.4K
01:14Identifying Statistically Significant Differences: The F-Test
3.8K
The F-test is used to compare two sample variances to each other or compare the sample variance to the population variance. It is used to decide whether an indeterminate error can explain the difference in their values. The underlying assumptions that allow the use of the F-test include the data set or sets are normally distributed, and the data sets are independent of each other. The test statistic F is calculated by dividing one variance by another. In other words, the square of one standard...
3.8K
01:22Sum and Difference OpAmps
1.4K
Operational amplifiers (op-amps) are versatile devices that extend beyond amplification. In this context, two specific op-amp configurations are explored: the summing and difference amplifiers.
A summing amplifier, or an adder, utilizes an op-amp to merge multiple input signals into a single output signal. When audio signals are introduced into its input channels, the input resistors initiate currents that traverse feedback resistors, resulting in an output voltage. Applying Kirchhoff's current...
A summing amplifier, or an adder, utilizes an op-amp to merge multiple input signals into a single output signal. When audio signals are introduced into its input channels, the input resistors initiate currents that traverse feedback resistors, resulting in an output voltage. Applying Kirchhoff's current...
1.4K
01:06Fixed Action Patterns
17.7K
A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
17.7K