#contrast

• Abcedography / Radiography of an abscess — A specialized radiological technique consisting of taking an X-ray of an abscess cavity, performed immediately following its puncture, evacuation of pus, and subsequent injection of a contrast medium or air to delineate its size, contours, and extension.
• Adenography — An imaging method or radiological investigation technique that allows the structural visualization and detailed examination of the glandular system or lymph nodes. This medical procedure is typically performed by introducing a radiopaque contrast medium into the efferent lymphatic vessels, followed by taking successive X-rays to detect abnormalities such as tumors, structural blockages, or chronic inflammation.
• Adversative — Expressing an opposition, contrast, or partial restriction between two syntactic elements, clauses, or coordinated textual units. In structural linguistics, the term classifies grammatical junctions or logical connectors that, without invalidating the first statement, introduce a corrective or restrictive nuance.
• Aerocystography — A radiological method for investigating the urinary bladder consisting of performing radiographs after the bladder cavity has been distended by insufflating a controlled amount of air or another sterile gas. This imaging examination highlights the contour of the bladder walls, detecting radiolucent tumors, calculi, or diverticula, functioning as a negative contrast medium.
• Aeromammography — A historical radiological method or experimental imaging technique for examining the mammary gland, consisting of performing radiographs after the controlled introduction or insufflation of air or another sterile gas as a negative contrast medium into the periglandular tissues or milk ducts, used to highlight tumors before the advent of modern digital mammography.
• Aerosialography — A radiological method of clinical investigation consisting of the examination of salivary glands and their excretory ducts by controlled injection of a small volume of air or gas as a negative contrast medium, followed by successive radiographs. This structural procedure enables the visualization of anatomical shapes, non-stereotypical salivary stones, or potential obstructions without using liquid iodinated substances.
• Black-and-white — Combining, alternating, or exclusively utilizing the colors white and black; devoid of intermediate chromatic nuances, except for gray tones. In visual arts, cinematography, and photography, the term describes the traditional technique or aesthetic style of rendering images without colors, emphasizing contrasts, shadows, and highlights. As an adverb, it expresses the radical way of viewing or perceiving a situation in a dual manner.
• Amidotrizoate — An iodinated organic compound with an aromatic structure, clinically used as a water-soluble, high-osmolality radiological contrast agent, also known as diatrizoate. Due to the high number of iodine atoms in its molecule, it strongly absorbs X-rays, facilitating clear structural visualization of blood vessels, the urinary tract (urography), and the gastrointestinal system during diagnostic imaging investigations.
• Amniography — A specialized clinical or historical radiological method of examining the uterine cavity and the fetus, consisting of injecting a radiopaque contrast medium directly into the amniotic fluid, followed by X-rays. It was used to delineate fetal contours, locate the placenta, or detect macroscopic malformations prior to the widespread use of modern ultrasound.
• Angiocardiography — A radiological imaging investigation method consisting of visualizing and recording on film or digital media the heart cavities and great blood vessels, through the introduction of a contrast medium via a catheter. This clinical structural procedure is essential in cardiology for evaluating circulatory dynamics, detecting aneurysms or septal defects, and establishing surgical indications.
• Angiocardiogram — A graphical representation, radiological image, or digital recording of the heart cavities and great blood vessels, obtained following an angiocardiography with a contrast medium. This clinical diagnostic structural element allows specialist physicians to analyze with three-dimensional precision the vascular lumen diameter, bloodstream dynamics, and potential structural defects or congenital cardiac malformations.
• Angiiopardiopneumography — A highly specialized radiological imaging investigation method that allows the structural visualization and recording, using a contrast medium, of the cardiac cavities, great vessels, and the entire pulmonary vascular network. This complex clinical procedure is utilized for the detailed evaluation of cardiopulmonary hemodynamics and the precise diagnosis of severe conditions such as massive pulmonary thromboembolism or complex congenital vascular malformations.
• Angiocolecistography — A radiological imaging investigation method that allows the structural visualization and recording of the gallbladder and the intrahepatic and extrahepatic biliary tracts, through the administration of a radiopaque contrast medium. This well-defined clinical procedure serves to detect obstructions, gallstones, or anatomical anomalies of the biliary tree, while also evaluating the dynamics of secretion elimination into the duodenum.
• Angioencephalography — A radiological imaging investigation method consisting of the visualization and structural recording of the cerebral vascular system, by injecting a radiopaque contrast medium into the carotid or vertebral arteries. This complex clinical procedure is essential in neurology and neurosurgery for detecting intracranial aneurysms, arteriovenous malformations, and vascular occlusion zones responsible for strokes.
• Angiofluorography — A high-precision imaging investigation method used in ophthalmology for the structural visualization and recording of blood circulation within the retinal and choroidal vessels, via the intravenous injection of a fluorescent dye (usually fluorescein). This well-defined clinical procedure is fundamental for diagnosing and monitoring diabetic retinopathy, macular degeneration, and retinal vascular occlusions.
• Angiofluoroscopy — A radiological imaging investigation method that allows the dynamic, real-time visualization on a fluorescent or digital screen of bloodstream flow and vessel structure following the injection of a contrast medium. This clinical structural procedure is widely used in interventional radiology and cardiovascular surgery for guiding catheters, placing stents, and immediately monitoring vascular lumen patency during operations.
• Angiographic — Relating to angiography, belonging to angiography, or performed through the radiological visualization of blood vessels with a contrast medium. In a clinical and structural context, this descriptor defines images, protocols, diagnostic signs, or interventional procedures based on the detailed rendering of anatomy and circulatory dynamics within the vascular lumen.
• Angiography — A radiological, invasive or minimally invasive imaging investigation method used for the visualization and structural recording of the lumen of blood vessels (arteries, veins) or lymphatic vessels, through the injection of a radiopaque contrast medium. This well-defined clinical procedure allows the precise detection of stenoses, occlusions, aneurysms, or vascular malformations, while also constituting the technical basis for interventional radiology procedures.
• Angiogram — A graphical representation, radiological image, or digital recording of the vascular system of an organ or anatomical region, obtained following an angiography. This clinical diagnostic structural element allows specialist physicians to analyze with three-dimensional precision the vascular lumen diameter, bloodstream dynamics, and the presence of potential obstructive or stenotic lesions.
• Angionephrography — A radiological imaging investigation method consisting of the visualization and structural recording of the renal vascular system (renal arteries and veins) and the renal parenchyma, through the injection of a radiopaque contrast medium. This complex clinical procedure is essential for diagnosing renal artery stenosis (a cause of renovascular hypertension), detecting local circulatory malformations, or evaluating the vascularization of parenchymal tumors.