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Popic J, Tipuric S, Balen I, Mrzljak A. Computed tomography colonography and radiation risk: How low can we go? World J Gastrointest Endosc 2021; 13:72-81. [PMID: 33763187 PMCID: PMC7958467 DOI: 10.4253/wjge.v13.i3.72] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 01/23/2021] [Accepted: 02/19/2021] [Indexed: 02/06/2023] Open
Abstract
Computed tomography colonography (CTC) has become a key examination in detecting colonic polyps and colorectal carcinoma (CRC). It is particularly useful after incomplete optical colonoscopy (OC) for patients with sedation risks and patients anxious about the risks or potential discomfort associated with OC. CTC's main advantages compared with OC are its non-invasive nature, better patient compliance, and the ability to assess the extracolonic disease. Despite these advantages, ionizing radiation remains the most significant burden of CTC. This opinion review comprehensively addresses the radiation risk of CTC, incorporating imaging technology refinements such as automatic tube current modulation, filtered back projections, lowering the tube voltage, and iterative reconstructions as tools for optimizing low and ultra-low dose protocols of CTC. Future perspectives arise from integrating artificial intelligence in computed tomography machines for the screening of CRC.
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Affiliation(s)
- Jelena Popic
- Department of Radiology, University Hospital Merkur, School of Medicine, University of Zagreb, Zagreb 10000, Croatia
| | - Sandra Tipuric
- Department of Family Medicine, Health Center Zagreb-East, Zagreb 10000, Croatia
| | - Ivan Balen
- Department of Gastroenterology and Endocrinology, General Hospital Slavonski brod “Dr. Josip Bencevic”, Slavonski Brod 35000, Croatia
| | - Anna Mrzljak
- Department of Medicine, Merkur University Hospital, School of Medicine, University of Zagreb, Zagreb 10000, Croatia
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Baccaro LM, Markelov A, Wilhelm J, Bloch R. Pneumoperitoneum after Virtual Colonoscopy: Causes, Risk Factors, and Management. Am Surg 2020. [DOI: 10.1177/000313481408000617] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Computed tomographic virtual colonoscopy (CTVC) is a safe and minimally invasive modality when compared with fiberoptic colonoscopy for evaluating the colon and rectum. We have reviewed the risks for colonic perforation by investigating the relevant literature. The objectives of this study were to assess the risk of colonic perforation during CTVC, describe risk factors, evaluate ways to reduce the incidence complications, and to review management and treatment options. A formal search of indexed publications was performed through PubMed. Search queries using keywords “CT colonography,” “CT virtual colonoscopy,” “virtual colonoscopy,” and “perforation” yielded a total of 133 articles. A total of eight case reports and four review articles were selected. Combining case reports and review articles, a total of 25 cases of colonic perforation after CTVC have been reported. Causes include, but are not limited to, diverticular disease, irritable bowel diseases, obstructive processes, malignancies, and iatrogenic injury. Both operative and nonoperative management has been described. Nonoperative management has been proven safe and successful in minimally symptomatic and stable patients. Colonic perforation after CTVC is a rare complication and very few cases have been reported. Several risk factors are recurrent in the literature and must be acknowledged at the time of the study. Management options vary and should be tailored to each individual patient.
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Affiliation(s)
- Leopoldo M. Baccaro
- Department of General Surgery, Easton Hospital, Drexel University College of Medicine, Easton, Pennsylvania
| | - Alexey Markelov
- Department of General Surgery, Easton Hospital, Drexel University College of Medicine, Easton, Pennsylvania
| | - Jakub Wilhelm
- Department of General Surgery, Easton Hospital, Drexel University College of Medicine, Easton, Pennsylvania
| | - Robert Bloch
- Department of General Surgery, Easton Hospital, Drexel University College of Medicine, Easton, Pennsylvania
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O'Shea A, Murray T, Morrin MM, Lee MJ, Thornton E. Incidence of clinically significant perforation at low dose non-contrast CT and its value prior to same day CT colonography following incomplete colonoscopy. Abdom Radiol (NY) 2020; 45:1044-1048. [PMID: 31123769 DOI: 10.1007/s00261-019-02062-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
PURPOSE Routine low dose non-contrast CT of the abdomen and pelvis has been suggested prior to same day completion CT colonography (CTC) to assess for occult perforation at preceding incomplete colonoscopy, before further gaseous insufflation at CTC. The aim of our study is to examine the incidence of clinically significant perforation at low dose CT. We also examine the benefits of low dose pre-scan in assessing adequacy of bowel preparation and identifying any other relevant contraindications to CT colonography. MATERIALS AND METHODS We conducted a retrospective review of all low dose non-contrast CTs performed following failed colonoscopies over a 4-year period (n = 392). We also assessed the adequacy of bowel preparation on a scale of 1-5, in order of increasingly adequate preparation. Incidentally noted bowel pathology and contraindications to CT colonography were also recorded. RESULTS No perforation was identified either prospectively or in the course of our retrospective review. However, 15 patients (3.8%) were found to have potential contraindications to CT colonography, including: acute diverticulitis, acute colitis, and poor bowel preparation. Overall, the bowel preparation was felt to be adequate (≥ 3) in 86% percent of patients. Two patients (0.5%) identified prospectively had their CT colonography postponed due to poor bowel preparation.
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Affiliation(s)
- Aileen O'Shea
- Massachusetts General Hospital, 55 Fruit Street, Boston, MA, 02114, USA.
| | - Timothy Murray
- Vancouver General Hospital, 899 W 12th Avenue, Vancouver, V5Z 1M9, Canada
| | | | | | - Eavan Thornton
- Bon Secours Hospital, Glasnevin Hill, Botanic, D09 YN97, Dublin 9, Ireland
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Maeda Y, Hirasawa D, Fujita N, Ohira T, Harada Y, Yamagata T, Koike Y, Suzuki K. Carbon dioxide insufflation in esophageal endoscopic submucosal dissection reduces mediastinal emphysema: A randomized, double-blind, controlled trial. World J Gastroenterol 2016; 22:7373-7382. [PMID: 27621583 PMCID: PMC4997641 DOI: 10.3748/wjg.v22.i32.7373] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Revised: 04/27/2016] [Accepted: 05/23/2016] [Indexed: 02/06/2023] Open
Abstract
AIM To assess the efficacy of CO2 insufflation for reduction of mediastinal emphysema (ME) immediately after endoscopic submucosal dissection (ESD).
METHODS A total of 46 patients who were to undergo esophageal ESD were randomly assigned to receive either CO2 insufflation (CO2 group, n = 24) or air insufflation (Air group, n = 22). Computed tomography (CT) was carried out immediately after ESD and the next morning. Pain and abdominal distention were chronologically recorded using a 100-mm visual analogue scale (VAS). The volume of residual gas in the digestive tract was measured using CT imaging.
RESULTS The incidence of ME immediately after ESD in the CO2 group was significantly lower than that in the Air group (17% vs 55%, P = 0.012). The incidence of ME the next morning was 8.3% vs 32% respectively (P = 0.066). There were no differences in pain scores or distention scores at any post-procedure time points. The volume of residual gas in the digestive tract immediately after ESD was significantly smaller in the CO2 group than that in the Air group (808 mL vs 1173 mL, P = 0.013).
CONCLUSION CO2 insufflation during esophageal ESD significantly reduced postprocedural ME. CO2 insufflation also reduced the volume of residual gas in the digestive tract immediately after ESD, but not the VAS scores of pain and distention.
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Ng P. Splenic injury as a complication of colonoscopy: more common than we think? BMJ Case Rep 2015; 2015:bcr-2015-209707. [PMID: 26354835 DOI: 10.1136/bcr-2015-209707] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Splenic injury during colonoscopy is thought to be rare. The case reported here would not have been diagnosed if the patient had not presented with a pleural effusion. It is likely that this complication may present with differing severities of clinical features with a significant proportion being thought to be due to expected postcolonoscopy insufflation discomfort. This complication is under-recognised and under-reported and therefore is unlikely to be thought of as a diagnosis. A 63-year-old woman had an elective day case colonoscopy but did not seek medical attention for the abdominal pain following the procedure. She presented to hospital 6 weeks after the procedure with dyspnoea and hypoxia. She was diagnosed with a parapneumonic pleural effusion but the CT scan also discovered a splenic haematoma for which there was no other cause in her history other than the colonoscopy 6 weeks prior.
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Affiliation(s)
- Peter Ng
- Mid Cheshire NHS Trust, Crewe, UK
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Clinical indications for computed tomographic colonography: European Society of Gastrointestinal Endoscopy (ESGE) and European Society of Gastrointestinal and Abdominal Radiology (ESGAR) Guideline. Eur Radiol 2015; 25:331-45. [PMID: 25278245 PMCID: PMC4291518 DOI: 10.1007/s00330-014-3435-z] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Iafrate F, Iussich G, Correale L, Hassan C, Regge D, Neri E, Baldassari P, Ciolina M, Pichi A, Iannitti M, Diacinti D, Laghi A. Adverse events of computed tomography colonography: an Italian National Survey. Dig Liver Dis 2013; 45:645-50. [PMID: 23643567 DOI: 10.1016/j.dld.2013.02.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2012] [Revised: 02/19/2013] [Accepted: 02/27/2013] [Indexed: 02/06/2023]
Abstract
AIM To retrospectively study the frequency and magnitude of complications associated with computed tomography (CT) colonography in clinical practice. METHODS A questionnaire on complications of CT colonography was sent to Italian public radiology departments identified as practicing CT colonography with a reasonable level of training. The frequency of complications and possible risk factors were retrospectively determined. Responses were collated and row frequencies determined. A multivariate analysis of the factors causing adverse events was also performed. RESULTS 40,121 examinations were performed in13 centers during the study period. No deaths were reported. Bowel perforations occurred in 0.02% (7 exams). All perforations were asymptomatic and occurred in patients undergoing manual insufflation. Five perforations (71%) occurred in procedures performed following a recent colonoscopy. There was no significant difference between perforations associated with rectal balloon (0.017%) and those that were not (0.02%). Complications related to vasovagal reaction (either with or without spasmolytic) occurred in 0.16% (63 exams). All vasovagal reactions resolved in less than 3h, without any sequelae. CONCLUSIONS Perforation rate at CT colonography in Italy is comparable with elsewhere in the world, occurring regardless of the experience of radiology centers. Although the risk is very small, it may not be negligible when compared with the risk of diagnostic colonoscopy.
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Affiliation(s)
- Franco Iafrate
- Department of Radiological Sciences, Oncology and Pathology, Sapienza University of Rome, Rome, Italy
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Pendsé DA, Taylor SA. Complications of CT colonography: a review. Eur J Radiol 2012; 82:1159-65. [PMID: 22595505 DOI: 10.1016/j.ejrad.2012.04.011] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2012] [Accepted: 04/04/2012] [Indexed: 12/23/2022]
Abstract
Since its inception, one of the main advantages of computed tomography colonography (CTC) over colonoscopy has been its assumed superior safety profile. However CTC is not without complication and adverse events are well described. Although the risks of insufflation, bowel preparation, contrast media and radiation dose are very small, they are not insignificant. This review discusses the potential hazards and complications associated with the technique, and discuss precautions, which may lessen the risk of occurrence.
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Affiliation(s)
- D A Pendsé
- Department of Imaging, University College London Hospitals NHS Foundation Trust, London, UK.
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Raju GS, Saito Y, Matsuda T, Kaltenbach T, Soetikno R. Endoscopic management of colonoscopic perforations (with videos). Gastrointest Endosc 2011; 74:1380-8. [PMID: 22136781 DOI: 10.1016/j.gie.2011.08.007] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/01/2011] [Accepted: 08/04/2011] [Indexed: 02/08/2023]
Affiliation(s)
- Gottumukkala S Raju
- Department of Gastroenterology, Hepatology, and Nutrition, University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA
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Fishback SJ, Pickhardt PJ, Bhalla S, Menias CO, Congdon RG, Macari M. Delayed presentation of splenic rupture following colonoscopy: clinical and CT findings. Emerg Radiol 2011; 18:539-44. [PMID: 21887533 DOI: 10.1007/s10140-011-0982-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2011] [Accepted: 08/15/2011] [Indexed: 12/17/2022]
Abstract
The purpose of this study is to investigate the clinical and CT findings in patients with symptomatic colonoscopy-induced splenic rupture, and to assess for common features among this cohort. Multi-center search yielded 11 adults with symptomatic splenic injury related to colonoscopy. Workup included abdominal CT in 10 (91%) cases and abdominal radiography in two patients (one patient had both). Colonoscopy findings, post-procedural course, and CT findings were systematically reviewed. Mean patient age was 62.2 years (range, 51-84 years); 8 (73%) of 11 were female. The majority (64%) of colonoscopies were for screening. No immediate complications were reported at optical colonoscopy; tortuosity/redundancy was noted in five cases. Except for a small (8 mm) polyp in one case and a large (10 mm) polyp in another, the remaining nine patients had either diminutive or no polyps. Only one patient presented with hemodynamic instability during post-colonoscopy recovery; the other ten had a delayed presentation ranging from 8 h to 8 days (mean, 2.1 days). All 11 patients presented with abdominal pain. CT was diagnostic for splenic injury with subcaspular and/or perisplenic hematoma in all ten CT cases. Hemoperitoneum was present in eight, visible splenic laceration in three cases, and splenic artery pseudoaneurysm in one case. Five patients underwent splenectomy (four emergent) and six patients were treated conservatively. Average hospital stay was 5.5 days (range, 3-10 days). Colonoscopy-induced splenic rupture characteristically presents as a delayed and often serious complication. In cases of apparent non-traumatic splenic hematoma or rupture at CT, eliciting a history of recent colonoscopy may identify the etiology.
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Affiliation(s)
- Shelby J Fishback
- Department of Radiology, University of Wisconsin School of Medicine and Public Health, E3/311 Clinical Science Center 600 Highland Ave., Madison, WI 53792-3252, USA
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Cha EY, Park SH, Lee SS, Kim JC, Yu CS, Lim SB, Yoon SN, Shin YM, Kim AY, Ha HK. CT colonography after metallic stent placement for acute malignant colonic obstruction. Radiology 2010; 254:774-82. [PMID: 20177092 DOI: 10.1148/radiol.09090842] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
PURPOSE To evaluate the feasibility of using computed tomographic (CT) colonography for preoperative examination of the proximal colon after metallic stent placement in patients with acute colon obstruction caused by colorectal cancer. MATERIALS AND METHODS Institutional review board approval was obtained, and patient informed consent was waived. Fifty patients (mean age +/- standard deviation, 58.5 years +/- 11.7), who demonstrated no postprocedural complication after successful placement of self-expandable metallic stents to treat acute colon obstruction caused by cancer, underwent CT colonography 1-43 days (median, 5 days) after stent placement. CT colonography was performed after cathartic preparation by using magnesium citrate (n = 20) or sodium phosphate (n = 3), combined with oral bisacodyl, or by using polyethylene glycol (n = 27). Fecal/fluid tagging was achieved by using 100 mL of meglumine diatrizoate. The colon was distended by means of pressure-monitored CO(2) insufflation. The sensitivity and specificity of CT colonography in evaluating the colon proximal to the stent and CT colonography-related complications were assessed. The 95% confidence intervals (CIs) were calculated for proportional data. RESULTS Per-lesion and per-patient sensitivities of CT colonography for lesions 6 mm or larger in diameter in the colon proximal to the stent were 85.7% (12 of 14 lesions; 95% CI: 58.8%, 97.2%) and 90% (nine of 10 patients; 95% CI: 57.4%, 99.9%), respectively. CT colonography depicted all synchronous cancers (two lesions) and advanced adenomas (five lesions). Per-patient specificity for lesions 6 mm and larger in the proximal colon was 85.7% (18 of 21 patients; 95% CI: 64.5%, 95.9%). CT colonography did not generate any false diagnosis of synchronous cancer. False-positive findings at CT colonography did not result in a change in surgical plan for any patients. No CT colonography-associated stent dislodgment/migration or colonic perforation occurred in any patient (95% CI: 0%, 6.2%). CONCLUSION CT colonography is a safe and useful method for preoperative examination of the proximal colon after metallic stent placement in patients with acute colon obstruction caused by cancer. (c) RSNA, 2010.
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Affiliation(s)
- Eun-Young Cha
- Department of Radiology and Research Institute of Radiology and Department of Surgery, University of Ulsan College of Medicine, Asan Medical Center, 388-1 Poongnap-Dong, Songpa-Gu, Seoul 138-040, Korea
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McFarland EG, Fletcher JG, Pickhardt P, Dachman A, Yee J, McCollough CH, Macari M, Knechtges P, Zalis M, Barish M, Kim DH, Keysor KJ, Johnson CD. ACR Colon Cancer Committee white paper: status of CT colonography 2009. J Am Coll Radiol 2010; 6:756-772.e4. [PMID: 19878883 DOI: 10.1016/j.jacr.2009.09.007] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2009] [Accepted: 09/02/2009] [Indexed: 12/21/2022]
Abstract
PURPOSE To review the current status and rationale of the updated ACR practice guidelines for CT colonography (CTC). METHODS Clinical validation trials in both the United States and Europe are reviewed. Key technical aspects of the CTC examination are emphasized, including low-dose protocols, proper insufflation, and bowel preparation. Important issues of implementation are discussed, including training and certification, definition of the target lesion, reporting of colonic and extracolonic findings, quality metrics, reimbursement, and cost-effectiveness. RESULTS Successful validation trials in screening cohorts both in the United States with ACRIN and in Germany demonstrated sensitivity > or = 90% for patients with polyps >10 mm. Proper technique is critical, including low-dose techniques in screening cohorts, with an upper limit of the CT dose index by volume of 12.5 mGy per examination. Training new readers includes the requirement of interactive workstation training with 2-D and 3-D image display techniques. The target lesion is defined as a polyp > or = 6 mm, consistent with the American Cancer Society joint guidelines. Five quality metrics have been defined for CTC, with pilot data entered. Although the CMS national noncoverage decision in May 2009 was a disappointment, multiple third-party payers are reimbursing for screening CTC. Cost-effective modeling has shown CTC to be a dominant strategy, including in a Medicare cohort. CONCLUSION Supported by third-party payer reimbursement for screening, CTC will continue to further transition into community practice and can provide an important adjunctive examination for colorectal screening.
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