Guidelines for Endoscopic Tattooing Prior to Surgical Resection

Pre‑Procedure Documentation

• Document that the tattoo is performed to facilitate intra‑operative localization of the colonic lesion during planned surgical resection. 1
• Record relevant comorbidities that may affect the procedure or postoperative course, such as prior abdominal surgery, anticoagulation status, diabetes, and cardiovascular disease. 2
• Assess and record bowel‑preparation quality using a validated scale (e.g., Boston Bowel Preparation Scale) because preparation adequacy influences visualization and accurate tattoo placement. 3

Intra‑Procedure Technical Details

• Identify the lesion’s precise anatomical location with clear landmarks (e.g., “sigmoid colon, 25 cm from the anal verge”). 4
• Measure and note lesion size and morphology. 5
• Document the distance of the lesion from key landmarks such as the ileocecal valve, colonic flexures, or rectum. 4
• Apply the saline‑bleb safety technique: inject 0.5–1.0 mL normal saline with a 22–25 G needle to create a submucosal bleb, confirming correct submucosal placement before any tattoo material is introduced. 4
• Use a sterile carbon‑particle suspension (e.g., SPOT®) as the tattooing agent, which is considered the standard of care. 1
• Inject 0.75–1.0 mL of the carbon suspension at each tattoo site after confirming submucosal placement with saline. 1

Placement Strategy for Surgical Cases

• Place tattoos both in line with the lesion and on the opposite colonic wall to maximize visibility from multiple angles during laparoscopic or open surgery. 4
• Deploy 2–3 circumferential tattoo sites (e.g., at 3, 6, 9 o’clock positions) around the lesion. 1
• Position each tattoo at least 3 cm distal to the lesion to avoid submucosal fibrosis that can complicate resection margins. 2
• Avoid tattooing at or immediately adjacent to the lesion, as perilesional placement increases fibrosis, surgical difficulty, and perforation risk. 2

Situations Where Tattooing Is Unnecessary

• Lesions located in the cecum or adjacent to the ileocecal valve do not require tattooing because these are obvious anatomic landmarks. 1
• Lesions within 5 cm of the anal verge (low rectum) do not require tattooing for the same reason. 1
• In these locations, obtain clear photographic images that show the lesion together with the relevant anatomic landmark. 1

Photographic Documentation Requirements

• Capture and archive images of each tattoo site in relation to the lesion using both standard white‑light and close‑up views. 1
• Ensure photographs clearly demonstrate the distance and clock‑face position of each tattoo relative to the lesion. 1
• Document the appearance of the submucosal bleb immediately after saline injection to confirm proper placement. 6

Post‑Procedure Instructions and Follow‑Up

• Provide written discharge instructions describing potential delayed complications (e.g., abdominal pain, fever) that could signal localized peritonitis, along with an emergency contact number. 2
• For patients on anticoagulation or antiplatelet therapy, outline an individualized plan for medication resumption that balances thrombo‑embolic risk against post‑procedure bleeding risk, ideally coordinated with the prescribing specialist before the procedure. 2
• Communicate detailed tattoo information—including exact placement locations and photographic documentation—to the surgical team to aid operative planning. 1

Institutional Standardization

• Develop and adopt a written standard protocol for endoscopic tattoo placement that all endoscopists and surgeons follow consistently. 1

Common Pitfalls and Preventive Measures

• Tattoo too close to the lesion – Maintaining a minimum distance of 3 cm prevents fibrosis that hampers surgical resection. 2
• Transmural injection – Failure to confirm submucosal placement before injecting carbon suspension can cause peritonitis or abscess; the saline‑bleb technique mitigates this risk. 4
• Insufficient injection volume – Injecting less than 0.75 mL per site may produce tattoos that are not visible intra‑operatively. 1
• Inadequate documentation – Omitting exact tattoo locations relative to the lesion creates confusion for the surgical team and may compromise lesion localization. 1

Guidelines for Endoscopic Tattooing Prior to Robotic Sigmoid Resection

1. Indications & Placement Strategy

2. Technical Details of Tattoo Injection

3. Safety Considerations

4. Documentation Requirements

5. Situations Where Tattooing May Be Unnecessary

All statements are derived from cited guideline societies and peer‑reviewed sources; strength of evidence was not explicitly graded in the source material.

Guidelines for Colonoscopic Tattooing to Minimize Ink Diffusion

Saline‑Bleb Safety Technique

• Inject 0.5–1.0 mL of normal saline with a 22–25 G sclerotherapy needle to create a visible submucosal bleb, confirming correct plane before any tattoo material is used. This step reduces the risk of transmural injection and subsequent peritoneal spillage. 15
• After confirming submucosal placement, inject 0.75–1.0 mL of sterile carbon particle suspension at each tattoo site. The two‑step approach limits lateral ink spread while providing adequate intra‑operative visibility. 15, 16
• The combined saline‑bleb and carbon‑suspension method prevents complications such as peritoneal spillage, localized peritonitis, abscess formation, and excessive lateral diffusion. 15

Optimal Injection Volume

• Use small‑volume injections (0.5–1.0 mL per site) rather than large boluses; this limits diffusion while preserving tattoo visibility for the surgical team. (Evidence derived from the same studies supporting the saline‑bleb technique.) 15

Strategic Placement of Tattoos

• Distance from lesion: Place tattoos ≥ 3 cm distal (anal side) to the lesion for endoscopic resection cases, and 3–5 cm distal for surgical cases. This spacing avoids perilesional fibrosis and preserves a clear resection margin. 15, 16, 17
• Avoid perilesional injection: Tattooing at or immediately adjacent to the lesion induces submucosal fibrosis, increases perforation risk, and can extend the required resection margin by ≈ 5 cm. 15

Prevention of Common Pitfalls

• Confirm submucosal placement before injecting carbon suspension; failure to do so is the primary cause of peritoneal spillage, extensive diffusion, localized peritonitis, abscess formation, and inflammatory pseudotumor. 15

Material Selection

• Use sterile carbon particle suspension (e.g., SPOT®) as the standard tattooing agent; sterile preparations markedly reduce the risk of bacterial inoculation and subsequent abscess formation compared with non‑sterile India ink. 15

Documentation Requirements

• Record the exact tattoo locations relative to the lesion (e.g., “three tattoos placed 3 cm distal at 3, 6, 9 o’clock positions”) to ensure precise communication with the surgical team. 17