Related Experiment Video
Updated: Feb 12, 2026
07:22
Surgical Robot-Assisted Transanal Specimen Extraction Radical Sigmoidectomy Without an Auxiliary Abdominal Incision
Published on: June 13, 2025
975
[Transanal conformal resection for super low rectal cancer]
1Department of Colorectal Surgery, Changhai Hospital, Navy Medical University, Shanghai 200433, China. louzhengpro@126.com.
Summary
Conformal Sphincter-Preserving Operation (CSPO) offers improved anal function for super low rectal cancer patients. Transanal Conformal Resection (TaCR) is a key component, preserving anal structures and function.
Area of Science:
- Surgical Oncology
- Colorectal Surgery
- Gastroenterology
Background:
- Intersphincteric resection (ISR) preserves the anus but can lead to poor anal function in some super low rectal cancer patients.
- Understanding anal canal anatomy is crucial for optimizing functional outcomes after rectal cancer surgery.
Purpose of the Study:
- To introduce the Conformal Sphincter-Preserving Operation (CSPO) for super low rectal cancer, focusing on Transanal Conformal Resection (TaCR).
- To detail the indications, techniques, and considerations for TaCR in managing very low rectal cancers while preserving anal function.
Main Methods:
- CSPO integrates total mesorectal excision (TME) with techniques like pull-through resection and transanal resection.
- TaCR involves transanal resection with precise incision lines to preserve rectal wall, internal sphincter, and dentate line.
- Laparoscopic TME is performed, followed by transanal resection, anastomosis creation away from the dentate line, and protective loop ileostomy.
Main Results:
- TaCR is indicated for specific tumor characteristics: within 2 cm of the dentate line, well-differentiated, ≤3 cm diameter or ≤1/3 intestinal wall circumference, and T1-T2 invasion depth.
- Patients achieving clinical complete remission after neoadjuvant therapy are candidates for TaCR.
- The technique emphasizes preserving key anatomical structures to potentially improve postoperative anal function.
Conclusions:
- CSPO, particularly TaCR, presents a viable anus-preserving approach for selected super low rectal cancer cases.
- Careful patient selection and meticulous surgical technique are essential for successful TaCR outcomes.
- Awareness and prompt management of potential postoperative complications like anastomotic leakage are critical.
Related Concept Videos
01:20Conformity
48.2K
Conformity is the change in a person’s behavior to go along with the group, even if that person does not agree with the group.
48.2K
01:27Assessing Body Temperature - Rectal
12.6K
Rectal temperature measurement is considered the most precise method for assessing core body temperature and typically registers higher than oral temperature. For adults, the rectal thermometer should be inserted 1 to 1.5 inches into the rectum to obtain the most accurate reading.
Follow these steps for rectal temperature assessment:
Step 1: Perform hand hygiene and don clean gloves to prevent cross-infection.
Step 2: Position the patient in a side-lying position to better visualize the rectal...
Follow these steps for rectal temperature assessment:
Step 1: Perform hand hygiene and don clean gloves to prevent cross-infection.
Step 2: Position the patient in a side-lying position to better visualize the rectal...
12.6K
02:20Conformations of Butane
18.3K
Unlike ethane and propane that have only two major conformations, butane has more than two conformers. The staggered form of butane in which the bulky methyl groups on the two carbons are placed on opposite sides, that is, at a dihedral angle of 180°, is the lowest energy, most stable form — called the anti conformer. This conformation is stabilized due to the absence of steric repulsion between the largely spaced out methyl groups. The other two staggered conformations are...
18.3K
02:29Conformations of Cycloalkanes
14.7K
Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3 hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that...
14.7K
02:11Conformations of Cyclohexane
15.9K
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
15.9K
02:18Conformations of Ethane and Propane
17.5K
In an organic molecule, free rotation about the carbon-carbon single bond results in energetically different conformers of the molecule. Due to this rotation, called the internal rotation, ethane has two major conformations — staggered and eclipsed.
Staggered conformation is a low energy and more stable conformation with the C-H bonds on the front carbon placed at 60°dihedral angles relative to the C-H bonds on the back carbon, leading to a reduced torsional strain. In staggered...
Staggered conformation is a low energy and more stable conformation with the C-H bonds on the front carbon placed at 60°dihedral angles relative to the C-H bonds on the back carbon, leading to a reduced torsional strain. In staggered...
17.5K