617 results found
Article
Greater trochanteric bursa injection (technique)
Greater femoral trochanteric bursa injections under ultrasound guidance ensure the injectate is accurately given into the bursa. The greater trochanteric bursa is the largest of the bursae surrounding the proximal femur, with the others including the subgluteus minimus and subgluteus medius burs...
Article
Cholesteatoma
Cholesteatomas are histologically equivalent to an epidermoid cyst and are composed of desquamated keratinizing stratified squamous epithelium forming a mass.
Clinical presentation
They may be asymptomatic, or may present with conductive hearing loss, dizziness, or otorrhea.
Pathology
The ma...
Article
Patent ductus arteriosus
Patent ductus arteriosus or arteriosum (PDA) is a congenital cardiac anomaly where there is persistent patency of the ductus arteriosus, a normal connection of the fetal circulation between the aorta and the pulmonary arterial system that develops from the 6th aortic arch.
Epidemiology
Patent ...
Article
PET-CT (overview)
PET-CT imaging is a form of dual-modality imaging that utilizes the advantages of both positron emission tomography (PET) and computed tomography (CT).
PET imaging excels at detailing physiologic or biologic phenomena through the administration of positron-emitting radiopharmaceuticals. The bi...
Article
Subglottic stenosis
Subglottic stenosis is a condition characterized by narrowing of the subglottic airway (region below the vocal cords). It can be congenital or acquired 1.
Epidemiology
Subglottic stenosis is the third most common congenital airway abnormality. The incidence of subglottic stenosis has decreased...
Article
Virtual reality
Advancements of technology have enabled various simulated reality devices, including virtual reality (VR) and augmented reality (AR). Both technologies provide stereoscopic and three-dimensional (3D) immersion of a simulated object. VR simulates a virtual environment while AR overlays simulated ...
Article
Preoperative pulmonary nodule localization
Preoperative pulmonary nodule localization is a CT-guided procedure where a marker is applied to a usually small lung lesion to assist in its surgical identification and resection. The widespread use of video-assisted thoracic surgery (VATS) and the advance in robotically assisted surgical inter...
Article
First-episode psychosis
First-episode psychosis refers to a clinical psychotic phenomenon occurring for the first time in an individual and can have a varied presentation with multiple risk and protective factors 2. Although the vast majority of individuals presenting with their first psychotic episode will not have an...
Article
Skull vault hemangioma
Skull vault hemangiomas (SVH), or hemangiomas of the calvaria, are benign slow-growing vascular lesions affecting the skull diploe in any location. They have been more recently renamed osseous venous (low-flow) vascular malformations given their nonneoplastic nature, but "hemangioma" remains com...
Article
Cam morphology (femoroacetabular impingement)
Cam morphology refers to an abnormal morphology of the femoral head-neck junction interlinked with an osseous asphericity of the femoral head. It is one possible cause of femoroacetabular impingement (FAI).
Terminology
Cam morphology is also commonly referred to as 'cam deformity', 'cam lesion...
Article
Juan M Taveras
Juan M Taveras (1919-2002) was an Dominican neuroradiologist, who is remembered chiefly for his work in establishing neuroradiology as a separate subspecialty in the United States. He was the principal mover behind the founding of the American Society of Neuroradiology and its primary publicati...
Article
Trepanation
Trepanation or trephination, commonly known as burr holes, is the act of intentionally perforating the skull for the purpose of healing or diagnosis.
Indications
Emergency indications
evacuation of extradural or subdural hematoma
insertion of intracranial pressure monitor
insertion of exter...
Article
Accessory renal artery
Accessory renal arteries are a common variant of the renal arteries. They are present in ~25% (range 20-30%) of the population and bilateral in ~10% 1. Accurate identification is of utmost importance for surgical planning prior to live donor transplantation 2,3 and renal artery embolization for ...
Article
Aorto-left renal vein fistula
Aorto-left renal vein fistula is an extremely rare complication of abdominal aortic aneurysm rupture. The initial clinical presentation is often non-specific, however, characteristic imaging findings, if recognized early, can lead to prompt diagnosis and assist in surgical planning.
Epidemiolo...
Article
Inferior vena cava filter retrieval
Inferior vena cava filter retrieval is an endovascular procedure whereby a previously placed inferior vena cava (IVC) filter is removed.
Procedure
The procedure is performed under local anesthesia with fluoroscopic guidance. Venous access is usually gained via the internal jugular vein with di...
Article
Inverted papilloma
Inverted papillomas are a type of Schneiderian papilloma, representing an uncommon non-cancerous sinonasal tumor that mostly affects middle-aged men. They occasionally undergo malignant transformation. On imaging, they classically demonstrate a convoluted cerebriform pattern seen on both T2 and ...
Article
Left anterior descending artery
The left anterior descending (LAD) artery, also known as the anterior interventricular branch, is one of the two branches of the left coronary artery (the other branch being the circumflex (Cx) artery).
Terminology
The left anterior descending artery is often given the sobriquet, the widow-mak...
Article
Breast imaging-reporting and data system (BI-RADS) assessment category 0
BI-RADS 0 is one of seven categories from the breast imaging-reporting and data system and is used when imaging is incomplete such as:
when further imaging or information is required, e.g. compression, magnification, special mammographic views, ultrasound
when requesting previous images not av...
Article
Frontal mucocele
A frontal mucocele is a paranasal sinus mucocele in a frontal sinus and is the most common location of all the paranasal sinus mucoceles 1.
Clinical presentation
Mucocoeles in the frontal sinus may be asymptomatic with insidious onset or present with headaches 2 and facial pain. Forehead (supr...
Article
April Fools'
The Radiopaedia editors have had a recurring commitment to prank the collective radiology community each year on April 1, an informal holiday known as April Fools' day. Sometimes months in the planning and creation, the pseudo-pathologies depicted on imaging are an exciting annual project the ed...
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