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Virtual colonoscopy

Pablo Mesejo, Daniel Pizarro, Armand Abergel, Olivier Rouquette, Sylvain Beorchia, Laurent Poincloux, Adrien Bartoli
We have developed a technique to study how good computers can be at diagnosing gastrointestinal lesions from regular (white light and narrow banded) colonoscopic videos compared to two levels of clinical knowledge (expert and beginner). Our technique includes a novel tissue classification approach which may save clinician's time by avoiding chromoendoscopy, a time-consuming staining procedure using indigo carmine. Our technique also discriminates the severity of individual lesions in patients with many polyps, so that the gastroenterologist can directly focus on those requiring polypectomy...
March 29, 2016: IEEE Transactions on Medical Imaging
Pablo Mesejo, Daniel Pizarro, Armand Abergel, Olivier Rouquette, Sylvain Beorchia, Laurent Poincloux, Adrien Bartoli
We have developed a technique to study how good computers can be at diagnosing gastrointestinal lesions from regular (white light and narrow banded) colonoscopic videos compared to two levels of clinical knowledge (expert and beginner). Our technique includes a novel tissue classification approach which may save clinician's time by avoiding chromoendoscopy, a time-consuming staining procedure using indigo carmine. Our technique also discriminates the severity of individual lesions in patients with many polyps, so that the gastroenterologist can directly focus on those requiring polypectomy...
September 2016: IEEE Transactions on Medical Imaging
Jiro Shimazaki, Akira Takemura, Kiyotaka Nishida, Hideki Kajiyama, Mitsugi Shimoda, Shuji Suzuki
Heterotopic ossification in colorectal carcinoma is extremely rare. This report presents the case of a 57-year-old male who had undergone a low anterior resection following a diagnosis of rectal carcinoma. Histological examination showed heterotopic ossification in the tumor. The patient was referred to Ibaraki Medical Center, Tokyo Medical University, with a diagnosis of rectal carcinoma by a local physician. Abdominal computed tomography revealed thickening of the rectal wall with calcified deposits, and virtual colonoscopy showed stenosis with a mass in the rectum...
September 2016: Case Reports in Oncology
Saad Nadeem, Joseph Marino, Xianfeng Gu, Arie Kaufman
We present a method for registration and visualization of corresponding supine and prone virtual colonoscopy scans based on eigenfunction analysis and fold modeling. In virtual colonoscopy, CT scans are acquired with the patient in two positions, and their registration is desirable so that physicians can corroborate findings between scans. Our algorithm performs this registration efficiently through the use of Fiedler vector representation (the second eigenfunction of the Laplace-Beltrami operator). This representation is employed to first perform global registration of the two colon positions...
January 2017: IEEE Transactions on Visualization and Computer Graphics
Yongkai Liu, Chaijie Duan, Jerome Liang, Jing Hu, Hongbing Lu, Mingyue Luo
PURPOSE: The human colon has complex geometric structures because of its haustral folds, which are thin flat protrusions on the colon wall. The haustral loop is the curve (approximately triangular in shape) that encircles the highly convex region of the haustral fold, and is regarded as the natural landmark of the colon, intersecting the longitude of the colon in the middle. Haustral loop extraction can assist in reducing the structural complexity of the colon, and the loops can also serve as anatomic markers for computed tomographic colonography (CTC)...
November 16, 2016: International Journal of Computer Assisted Radiology and Surgery
Giorgia A Osman, Alberto Ricci, Fabrizio Terzo, Carlo Falasca, Maria R Giovagnoli, Pierdonato Bruno, Andrea Vecchione, Salvatore Raffa, Sabatino Valente, Maria R Torrisi, Chiara De Dominicis, Simonetta Giovagnoli, Salvatore Mariotta
INTRODUCTION: Lipoid pneumonia is a clinical condition that may be initially asymptomatic or confused with an infectious or malignant lung disease. OBJECTIVES: We report four cases of this pathological condition. METHODS: The first case concerned an 85-year old woman with bilateral confluent pulmonary opacities, ground-glass type. Diagnosis was based on the cytology of the bronchoalveolar lavage (BAL) fluid followed by its ultrastructural examination...
September 22, 2016: Clinical Respiratory Journal
J Van Der Wat
No abstract text is available yet for this article.
November 2015: Journal of Minimally Invasive Gynecology
Frank T Kolligs
Colorectal cancer is one of the leading causes of cancer-related morbidity and mortality. Main risk factors include advanced age, family history, male sex, and lifestyle factors. Screening can reduce incidence and death from colorectal cancer. Therefore, prevention and early detection are crucial in order to detect and remove pre-neoplastic adenomas and to detect cancers at early stages. Colonoscopy, flexible sigmoidoscopy, and fecal occult blood tests are established tools for screening. Newer fecal immunochemical tests reveal higher sensitivities for advanced adenoma and cancer than guaiac-based hemoccult tests...
June 2016: Visceral Medicine
Beom Sun Chung, Min Suk Chung, Hyung Seon Park, Byeong-Seok Shin, Koojoo Kwon
Novice doctors may watch tutorial videos in training for actual or computed tomographic (CT) colonoscopy. The conventional learning videos can be complemented by virtual colonoscopy software made with a cadaver's sectioned images (SIs). The objective of this study was to assist colonoscopy trainees with the new interactive software. Submucosal segmentation on the SIs was carried out through the whole length of the large intestine. With the SIs and segmented images, a three dimensional model was reconstructed...
November 2016: Annals of Anatomy, Anatomischer Anzeiger: Official Organ of the Anatomische Gesellschaft
Emilio Di Giulio, Stefano Angeletti, Federico Desideri
Recent-years technological innovation has achieved two important objectives: 1) to develop advanced diagnostic tools able to determine with a fair degree of accuracy the nature of a lesion by means of the simple endoscopic observation; 2) to improve the therapeutic approach to lesions, by extending the least-invasive endoscopic treatment also to lesions that in the past were referred to surgery. Advanced diagnostic methodologies have been achieved thanks to the introduction of high definition endoscopes and virtual chromo-endoscopy...
June 2016: Recenti Progressi in Medicina
Jiro Shimazaki, Takanobu Tabuchi, Kiyotaka Nishida, Akira Takemura, Gyo Motohashi, Hideki Kajiyama, Shuji Suzuki
Ovarian metastasis of colorectal cancer is relatively rare. The present study reports two cases of synchronous ovarian metastasis from colorectal cancer, which were managed by cytoreductive surgery. In case one, a 60-year-old female patient presented with a multilocular pelvic tumor and ascites. Virtual colonoscopy revealed a mass in the sigmoid colon; however, no tumor cells were identified on histological examination. Ovarian metastasis from sigmoid colon cancer was suspected and adnexectomy was subsequently performed...
July 2016: Oncology Letters
Ethan A Halm, Elisabeth F Beaber, Dale McLerran, Jessica Chubak, Douglas A Corley, Carolyn M Rutter, Chyke A Doubeni, Jennifer S Haas, Bijal A Balasubramanian
BACKGROUND: Population outreach strategies are increasingly used to improve colorectal cancer (CRC) screening. The influence of primary care on cancer screening in this context is unknown. OBJECTIVE: To assess associations between primary care provider (PCP) visits and receipt of CRC screening and colonoscopy after a positive fecal immunochemical (FIT) or fecal occult blood test (FOBT). DESIGN: Population-based cohort study. PARTICIPANTS: A total of 968,072 patients ages 50-74 years who were not up to date with CRC screening in 2011 in four integrated healthcare systems (three with screening outreach programs using FIT kits) in the Population-Based Research Optimizing Screening through Personalized Regimens (PROSPR) consortium...
October 2016: Journal of General Internal Medicine
Cláudia Paiva, Filomena Soares, Raquel da Inez Correia, Vítor Valente
INTRODUCTION: Inflammatory myofibroblastic tumor (IMFT) is an uncommon mesenchymal solid tumor commonly documented in children and young adults. It is usually located in lungs however, extrapulmonary involvement has also been reported. Here we report a case of IMFT presenting as an ileocecal intussusception. PRESENTATION OF CASE: A 55-year-old man presented with a two months history of colicky abdominal pain, more intense at the right inferior abdominal quadrant, and unintentional weight loss of 8kg in the previous four months...
2016: International Journal of Surgery Case Reports
N Maggialetti, R Capasso, D Pinto, M Carbone, A Laporta, S Schipani, C L Piccolo, M Zappia, A Reginelli, M D'Innocenzo, L Brunese
INTRODUCTION: This study evaluated the role of computed tomography colonography (CTC) in patients who previously underwent incomplete optical colonoscopy (OC). We analyzed the impact of colonic lesions in intestinal segments not studied by OC and extracolonic findings in these patients. METHODS: Between January 2014 and May 2015, 61 patients with a history of abdominal pain and incomplete OC examination were studied by CTC. CTCs were performed by 320-row CT scan in both the supine and the prone position, without intravenous administration of contrast medium...
September 2016: International Journal of Surgery
Jenny-Claude Millochau, Carole Abo, Basma Darwish, Emmanuel Huet, Gauthier Dietrich, Horace Roman
We present the case of a patient in whom consecutive imaging assessment and surgery demonstrated the obvious progression of colorectal endometriosis under continuous medical therapy. A 26-year-old nullipara presented with secondary dysmenorrhea, deep dyspareunia, diarrhea, and constipation during menstruation. Magnetic resonance imaging (MRI) assessment revealed 2 right ovarian endometriomas, but no deep endometriosis lesion. Intraoperatively, we found a 2-cm length of thickened and congestive area of sigmoid colon, along with small superficial lesions arising in the small bowel and appendix...
July 2016: Journal of Minimally Invasive Gynecology
Ioannis S Papanikolaou, Pantelis S Karatzas, Lazaros T Varytimiadis, Athanasios Tsigaridas, Michail Galanopoulos, Nikos Viazis, Dimitrios G Karamanolis
Colonoscopy has substantially evolved during the last 20 years and many different training techniques have been developed in order to improve the performance of endoscopists. The most known are mechanical simulators, virtual reality simulators, computer-simulating endoscopy, magnetic endoscopic imaging, and composite and explanted animal organ simulators. Current literature generally indicates that the use of simulators improves performance of endoscopists and enhances safety of patients, especially during the initial phase of training...
2016: Advances in Medical Education and Practice
Andrew B Rosenkrantz, Wenyi Wang, Richard Duszak
RATIONALE AND OBJECTIVES: This study aimed to characterize associations between availability of imaging services and intensity of teaching among US hospitals. MATERIALS AND METHODS: Using the American Hospital Association Annual Survey Database, we studied information regarding the availability of imaging services at general hospitals nationwide in 2007 (4102 hospitals) and in 2012 (3876). Teaching intensity was categorized as Council of Teaching Hospitals (COTH) member, non-COTH teaching hospital (non-COTH member with affiliated medical school and/or residency), and nonteaching hospital...
August 2016: Academic Radiology
Tomislav Švestka, Tomáš Krechler
Colorectal cancer is one the most frequently diagnosed cancer at the presence. The mortality can be reduced by early investigations. Screening tests are able to detect both early adenomatous polyps and cancers soon (immunochemical tests, colonoscopy and other methods virtual colonoscopy etc.).
2016: Casopís Lékar̆ů C̆eských
Jin-Ya Liu, Li-Da Chen, Hua-Song Cai, Jin-Yu Liang, Ming Xu, Yang Huang, Wei Li, Shi-Ting Feng, Xiao-Yan Xie, Ming-De Lu, Wei Wang
AIM: To present our initial experience regarding the feasibility of ultrasound virtual endoscopy (USVE) and its measurement reliability for polyp detection in an in vitro study using pig intestine specimens. METHODS: Six porcine intestine specimens containing 30 synthetic polyps underwent USVE, computed tomography colonography (CTC) and optical colonoscopy (OC) for polyp detection. The polyp measurement defined as the maximum polyp diameter on two-dimensional (2D) multiplanar reformatted (MPR) planes was obtained by USVE, and the absolute measurement error was analyzed using the direct measurement as the reference standard...
March 28, 2016: World Journal of Gastroenterology: WJG
Xinjie Xu, Chunhua Xu, Shakir M Saud, Xiaoming Lu, Lei Liu, Li Fang, Xiaowei Zhang, Jiangong Hu, Weidong Li
The dysregulation of TGF-β/Smads signaling pathway has been postulated to contribute to the development of ulcerative colitis (UC) and the manifestation of clinical symptoms. Kuijie Granule is a prescription medicine used clinically in China to alleviate the symptoms associated with UC. To evaluate whether the clinical benefit of Kuijie Granule is associated with TGF-β/Smads signaling, we measured the expression levels of TGF-β/Smads signaling proteins (TGF-β1, TGF-βRII, Smad2, Smad4, Smad6, and Smad7) in the intestinal mucosa of 72 patients with UC treated with Kuijie Granule for 60 days...
2016: Evidence-based Complementary and Alternative Medicine: ECAM
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