ABSTRACT
OBJECTIVE: To show our experience and results in Virtual Colonoscopy (VC). MATERIAL AND METHOD: Five hundred patients with personal or familial history of colorectal carcinoma and/or adenomas, or any kind of coloproctologic symptoms were studied. VCs were practiced using a helical CT scanner (300 patients) and a multislice CT scanner (200 patients) a few hours after Conventional Colonoscopy (CC), considered the gold standard. The patients were evaluated in a prospective blind study, to determine sensitivity and specificity of VC. Findings were classified as: 1) normal studies; 2) studies with pathological findings. This one was subdivided into: 2a) Lesions below 5 mm., 2b) Lesions between 5-9 mm., 2c) Lesions above 9 mm. RESULTS: VC detected 253 normal studies whereas CC only detected 233. The sensitivity and specificity for each subgroup were: 2a) 87.8% and 86.9%; 2b) 95.6% and 91.4%; 2c) 100.0% and 100.0% respectively. CONCLUSION: VC is a feasible and useful method for evaluating the entire colon. It is well tolerated, it has no complications and a high sensitivity and specificity for elevated lesions, especially the ones above or equal to 5 mm.
Subject(s)
Middle Aged , Humans , Male , Female , Adult , Colonic Polyps , Colonoscopy , Colorectal Neoplasms , Predictive Value of Tests , Prospective Studies , Sensitivity and Specificity , Single-Blind MethodABSTRACT
OBJECTIVE: To define the role of virtual gastroscopy (VG) in the detection of elevated lesions comparing its results with conventional endoscopy (CE) as the gold standard method. MATERIALS AND METHODS: Between December 2000 and July 2001, 19 patients were evaluated. The age ranged between 41 and 72 (mean 58.8 years old). VG and CE were performed in all the patients during the same week. VG were carried out with a multislice CT scanner (Mx 8000, Marconi Medical Systems). The technical parameters used were 3 mm with slices and 1.5 mm reconstruction intervals. The acquisition time was 22 seconds. Images were sent to a workstation (MxView, Marconi Medical Systems) where they were reprocessed in three different ways: 1) Bidimensionally 2) Tridimensionally 3) Virtual Endoscopy Findings of VG were compared with CE. RESULTS: VG detected 39 lesions, whereas CE detected 40 lesions. There were 39 true-positive findings, 2 true-negative findings, 0 false-positive findings and 1 false-negative findings. The Sensitivity (Se) was 97.5%; Specificity (Sp) was 100%, positive predictive value 100% and Negative predictive value 66%. CONCLUSIONS: VG is a new non-invasive method with high Se and Sp in the detection of elevated lesions. The actual role of VG consist in identification of gastric lesions and possibility to diagnose gastric disease
Subject(s)
Humans , Adult , Middle Aged , Gastroscopy , Image Processing, Computer-Assisted , Sensitivity and Specificity , Stomach Diseases , Tomography, X-Ray Computed , Predictive Value of TestsABSTRACT
Con el objeto de mostrar una nueva modalidad diagnóstica no invasiva en el diagnóstico precoz del cáncer colorrectal se analizaron 46 pacientes seleccionados sobre la base del cuadro clínico y/o los antecedentes de enfermedad colorrectal o poliposis familiar. Los hallazgos obtenidos por colonoscopía virtual los dividimos en siete grupos: lesión polipoidea única (9 pacientes), lesiones polipoideas asociadas (11); estenosis tumorales sin lesión sincrónica (3); estenosis tumorales con lesión sincrónica (6); estenosis no tumorales (4); estudios normales (2); pacientes excluidos por mala preparación. Concluimos que la colonoscopia virtual es una alternativa válida en el screening de la patología colorrectal, presentando algunas ventajas sobre los estudios habituales, ya que no es invasivo, no requiere sedación y permite la estadificación de la enfermedad neoplásica
Subject(s)
Humans , Male , Female , Adult , Middle Aged , Colonoscopy , Colorectal Neoplasms/diagnosis , Colonic Polyps/diagnosis , Neoplasm Staging , Straining of Liquids , Tomography, X-Ray Computed/methodsABSTRACT
Nuestro objetivo fue valorar la utilidad de la angiotomografía computada 3D helicoidal (ATC) en relación con los métodos habituales de diagnóstico (angiorresonancia y eco Doppler), en la estenosis cartídea exocraneal. Para ello, fueron estudiadas con las tres modalidades, 32 arterias carótidas internas en 16 pacientes sintomáticos. Se realizaron las mediciones correspondientes, según el método N.A.S.C.E.T., obteniendo porcentajes de sensibilidad y especificidad de la ATC respecto a la angiorresonancia (ARM). Nuestros hallazgos permitirían incluir la ATC como segundo método prequirúrgico, en pacientes claustrofóbicos o que presenten contraindicaciones para la ARM
Subject(s)
Humans , Male , Female , Middle Aged , Carotid Stenosis/diagnosis , Angiography , Carotid Artery, Internal/pathology , Carotid Artery, Internal , Magnetic Resonance Spectroscopy , Carotid Stenosis , Sensitivity and Specificity , Tomography, X-Ray Computed , Ultrasonography, Doppler, ColorABSTRACT
Propósito: demostrar la utilidad de la Angio-Tomografía Computada (ATC) en la detección de complicaciones en pacientes con tratamiento de aneurisma de aorta abdominal. Material y métodos: cincuenta y cinco ATC se realizaron como control en pacientes tratados, 42 con colocación de endoprótesis y 13 con cirugía a cielo abierto. Resultados: se detectaron 16 complicaciones, 8 casos en el grupo de pacientes con tratamiento endovascular y 8 en el grupo. Todos los diagnósticos fueron confirmados con angiografía digital o tratamiento quirúrgico. Conclusión: la ATC es un método diagnóstico certero, rápido y mínimamente invasivo en la evaluación de complicaciones en pacientes con tratamiento de aneurismas de aorta