Articles
Articles are a collaborative effort to provide a single canonical page on all topics relevant to the practice of radiology. As such, articles are written and continuously improved upon by countless contributing members. Our dedicated editors oversee each edit for accuracy and style. Find out more about articles.
16,879 results found
Article
Abdomen (PA prone view)
The PA prone radiograph is rarely performed and is often utilized when a patient is unable to lay supine. The projection is adequate for the examination of the abdominal cavity, however, not as practical for the renal structures due to magnification.
Indications
This view is useful in visualiz...
Article
Abdomen radiograph (pediatric)
The abdomen radiograph is a commonly requested examination in the pediatric patient. Children that present for abdominal x-rays are often very unwell, therefore specialized techniques and appropriate communication are essential for gaining the child's cooperation.
Indications
Performing abdom...
Article
Abdominal adhesions
Abdominal adhesions are bands of scar tissue (fibrous or fibrofatty), most often occurring as a complication of previous abdominal surgery.
Pathology
Adhesions often occur with
multiple abdominal operations or previous postoperative intra-abdominal complications
history of intra-abdominal infla...
Article
Abdominal and pelvic anatomy
Abdominal and pelvic anatomy encompasses the anatomy of all structures of the abdominal and pelvic cavities.
This anatomy section promotes the use of the Terminologia Anatomica, the international standard of anatomical nomenclature.
Article
Abdominal aorta
The abdominal aorta (plural: aortas or aortae 4) is the main blood vessel in the abdominal cavity that transmits oxygenated blood from the thoracic cavity to the organs within the abdomen and to the lower limbs.
Summary
origin: continuation of descending thoracic aorta at T12
course: descend...
Article
Abdominal aortic aneurysm
Abdominal aortic aneurysms (AAA) are focal dilatations of the abdominal aorta measuring 50% greater than the proximal normal segment or >3 cm in maximum diameter.
They can be confined to the abdominal aorta or continue from the thoracic aorta as part of a thoraco-abdominal aneurysm (TAAA).
The...
Article
Abdominal aortic aneurysm rupture
Abdominal aortic aneurysm (AAA) rupture is a feared complication of abdominal aortic aneurysm and is a surgical emergency. It is part of the acute aortic syndrome spectrum.
Epidemiology
Abdominal aortic aneurysms are common and affect ~7.5% of patients aged over 65 years 6.
The risk of ruptur...
Article
Abdominal aortic aneurysm (summary)
This is a basic article for medical students and other non-radiologists
Abdominal aortic aneurysms (AAA) are focal dilatations of the abdominal aorta that are 50% greater than the proximal normal segment or >3 cm in maximum diameter.
Reference article
This is a summary article; read more in o...
Article
Abdominal aortic injury
Abdominal aortic injuries are a very rare form of traumatic aortic injury and are much less common than thoracic aortic injury.
Epidemiology
Aortic injury occurs in <1% of blunt trauma patients, with abdominal aortic injury representing only ~5% of all aortic injuries 1. Males are more freque...
Article
Abdominal cavity
The abdominal cavity is divided into two major compartments, the peritoneum and retroperitoneum, early in fetal development.
The parietal peritoneum is reflected over the peritoneal organs, forming supporting peritoneal ligaments, mesenteries, and omenta.
The peritoneal reflections carry vess...
Article
Abdominal compartment syndrome
Abdominal compartment syndrome is a disease defined by the presence of new end-organ dysfunction secondary to elevated intra-abdominal pressure. Radiological diagnosis is difficult and usually suggested when a collection of imaging findings are present in the appropriate clinical setting or if t...
Article
Abdominal distension (mnemonic)
A mnemonic for causes of abdominal distension (6 Fs) is:
F: fat
F: fluid
F: flatus
F: feces
F: fetus
F: fulminant mass
Article
Abdominal ectopic pregnancy
Abdominal ectopic pregnancies are an extremely rare type of ectopic pregnancy.
Epidemiology
They are thought to represent ~1% of all ectopic pregnancies 6 with an estimated incidence of 1:1000-10,000 births.
Pathology
It is often thought that they most frequently result from a tubal rupture ...
Article
Abdominal hernia
Abdominal hernias/herniae may be congenital or acquired and come with varying eponyms. They are distinguished primarily based on type, location and content.
Epidemiology
75-80% of all hernias are inguinal ref.
Pathology
Content of the hernia is variable, and may include:
small bowel loops
...
Article
Abdominal imaging (dual-energy CT)
The role of dual energy CT is becoming increasingly more prevalent abdominal imaging due to the availability of scanners and increasing field of research.
Acute bowel ischemia
The addition of iodine maps and 40-keV monoenergetic images to standard single energy CT images was found to increase ...
Article
Abdominal (lateral view)
The lateral view abdominal radiograph is a less common projection of the abdomen, it is different from the lateral decubitus view of the abdomen and looks more like a lateral lumbar spine view.
Indications
This projection is often requested as a useful problem-solving view that can complement ...
Article
Abdominal migraine
Abdominal migraine is a syndrome that presents as recurrent episodes of severe paroxysmal abdominal pain, coupled with vasomotor symptoms, nausea, and emesis that lasts for at least 1 hour 3. Historically it has tended to be a pediatric diagnosis, but it is now increasingly seen in adults. It is...
Article
Abdominal opacities
An opacity projecting over the abdomen has a broad differential. Possibilities to consider include:
foreign bodies
ingested, e.g. coins, batteries, bones, etc
artifacts, e.g. object attached to the cloth of the patient like a safety pin or button
iatrogenic, e.g. hemostatic clips, gastric ba...
Article
Abdominal organ echogenicity (mnemonic)
This mnemonic helps to remember the relative echogenicity of abdominal organs on ultrasound:
Darling Parents So Love Kids
Mnemonic
From most to least echogenic:
D: diaphragm
P: pancreas
S: spleen
L: liver
K: kidneys (cortex)
Article
Abdominal pain in pregnancy protocol (MRI)
The abdominal pain in pregnancy MRI protocol encompasses a set of MRI sequences for assessment of causes of non-traumatic abdominal pain in pregnancy.
Note: This article aims to frame a general concept of an MRI protocol for the assessment of the abdomen in pregnancy. Protocol specifics will va...