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.
More than 200 results
Article
Hepatolithiasis
Hepatolithiasis is the presence of bile duct stones within the intrahepatic bile ducts, specifically proximal to the confluence of the right and left hepatic ducts.
Epidemiology
Hepatolithiasis is common in Asia and the Pacific, with a prevalence of ~40%. It is rare in the West with a prevale...
Article
Bone deformity from softening
Conditions associated with bone deformity from softening includes:
hourglass thorax
bowing of long bones
acetabular protrusion
buckled/compressed pelvis
biconcave vertebral bodies / codfish vertebra
Article
Subdivisions of the cerebellar vermis (mnemonic)
A useful mnemonic to remember the nine lobules of the cerebellar vermis is:
Like Cats Catching Dogs For The Party Up North
Mnemonic
L: lingula
C: central lobule
C: culmen
D: declive
F: folium
T: tuber
P: pyramid
U: uvula
N: nodulus
Article
Pneumolipohaemarthrosis
Pneumolipohaemarthrosis is the presence of intra-articular gas in a lipohemarthrosis. It indicates an open intra-articular fracture.
Article
Asbestos-related diseases
Asbestos-related disease, in particular affecting the lung, comprise of a broad spectrum of entities related to the inhalational exposure to asbestos fibers. They can be divided into benign and malignant processes 1-3.
Benign pleural and parenchymal lung disease
asbestos-related benign pleural...
Article
Bone age (radiograph)
The bone age radiograph of the hand and wrist is a commonly performed examination to determine the radiographic age of the patient via the assessment of growth centers.
Indications
Bone age radiographs may be indicated for both clinical and non-clinical purposes 6,7:
for the investigation of
...
Article
C-reactive protein
C-reactive protein (CRP) is an acute phase reactant commonly measured in clinical practice as a marker of inflammation and to monitor disease severity, disease course and treatment response. It should not be confused with protein C (an anticoagulant) or C-peptide (a component of proinsulin).
Ph...
Article
M sign (inferior frontal gyrus)
The M sign refers to the characteristic "M" configuration of the inferior frontal gyrus, as it forms (from front to back) the pars orbitalis, pars triangularis, and, pars opercularis.
Article
Henry (SI unit)
The henry (symbol: H) is the SI derived unit of electrical inductance.
Terminology
As per all other eponymous SI units when the unit is written out in full it is not capitalized, but when shortened to its symbol it is capitalized.
History and etymology
The henry is named in honor of Joseph ...
Article
American College of Radiology published guidelines
The American College of Radiology (ACR) publishes and updates imaging guidelines, sometimes in collaboration with other bodies, on a range of imaging pathologies and reporting issues:
adrenal incidentalomas: white paper
breast lesions: BI-RADS
head and neck cancer: NI-RADS
liver lesions: LI-...
Article
Meyers and McKeever classification of ACL avulsion fractures
Meyers and McKeever classification is used to categorize ACL avulsion fractures.
Usage
The Meyers and McKeever classification is the most frequently used system (c. 2024) to describe ACL avulsion fractures 2.
Classification
Under the Meyers and McKeever system (with modifications by Zariczny...
Article
Periportal halo (CT/US)
Periportal halo or periportal collar sign refers to a zone of low attenuation seen around the intrahepatic portal veins on contrast-enhanced CT or hypoechogenicity on liver ultrasound. It likely represents periportal edema, which is often used as a synonymous term. Periportal haloes may occur ar...
Article
Skeletal survey (overview)
The skeletal survey is a radiographic series performed to survey the entire skeleton (axial skeleton, upper and lower limbs) for pathology or injury. Specific projections vary depending on the clinical indication and the institution's protocol.
There are various clinical indications that may wa...
Article
Bowl of grapes sign
The bowl of grapes sign has been described in synovial sarcoma. It refers to the characteristic multilobulated lesion subdivided by multiple septa, forming large cystic foci with regions of hemorrhage.
Article
Psoriasis
Psoriasis is an inflammatory dermatological disease with several variants. The most common variant is plaque psoriasis, other variants of the disease are guttate, erythrodermic and pustular psoriasis 1.
Epidemiology
There is a geographic variation in the prevalence of psoriasis such that popul...
Article
Right lower lobe collapse
Right lower lobe (RLL) collapse forms a triangular opacity extending from the hilum to the diaphragm. There is less overlap with the heart shadow compared to left lower lobe collapse.
Findings of lower lobe collapse can be grouped together as they are almost identical on both sides.
For a gen...
Article
Anderson and Montesano classification of occipital condyle fractures
The Anderson and Montesano classification is a widely used system for describing occipital condyle fractures. It divides injuries into three types based on morphology and mechanism of injury 1-5.
Classification
type I: impacted type occipital condyle fracture
morphology: comminution of the co...
Article
Os odontoideum
Os odontoideum (plural: ossa odontoidea) is an anatomic variant of the odontoid process of C2 and needs to be differentiated from persistent ossiculum terminale and from a type 2 odontoid fracture. It can be associated with atlantoaxial instability.
Although it was originally thought to be a c...
Article
Orthopantomography
The orthopantomogram (also known as an orthopantomograph, pantomogram, OPG or OPT) is a panoramic single image radiograph of the mandible, maxilla and teeth. It is often encountered in dental practice and occasionally in the emergency department; providing a convenient, inexpensive and rapid way...
Article
Germ cell tumors of the ovary
Germ cell tumors of the ovary account for approximately 15-20% of all ovarian tumors. In children and adolescents, up to 60% of ovarian tumors can be of germ cell origin.
They include:
ovarian teratoma(s): commonest primary benign tumor of ovary and commonest germ cell tumor:
mature (cystic) ...
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