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[1] [2] The presence of the steeple sign supports a diagnosis of croup, usually caused by paramyxoviruses. [3] It can also be defined as the replacement of the usual squared-shoulder appearance of the subglottic area by cone-shaped narrowing just distal to the vocal cords. This is called the steeple or pencil-point sign.
Croup (/ k r uː p / KROOP), also known as croupy cough, is a type of respiratory infection that is usually caused by a virus. [2] The infection leads to swelling inside the trachea, which interferes with normal breathing and produces the classic symptoms of "barking/brassy" cough, inspiratory stridor and a hoarse voice. [2]
In patients younger than 12, wrist fractures cause specific alterations at the surface of the bone (bulge, angulation, offset or fracture gap), and through diagnosis and treatment can be identified without X-ray imaging. [14] Intra-articular fractures are rare and require X-ray imaging. The standard procedure is the wrist SAFE algorithm. [15]
In many cases, the production of these images is based on the mathematical procedure tomographic reconstruction, such as X-ray computed tomography technically being produced from multiple projectional radiographs. Many different reconstruction algorithms exist.
Jacob deGrom had reconstructive surgery to repair a torn ulnar collateral ligament in his right elbow Monday, and Texas Rangers manager Bruce Bochy said the procedure went well. The typical ...
The main limitation of this type of CT is the bulk and inertia of the equipment (X-ray tube assembly and detector array on the opposite side of the circle) which limits the speed at which the equipment can spin. Some designs use two X-ray sources and detector arrays offset by an angle, as a technique to improve temporal resolution. [8] [9]
Ulnar collateral ligament reconstruction, colloquially known as Tommy John surgery, is a surgical graft procedure where the ulnar collateral ligament in the medial elbow is replaced with either a tendon from elsewhere in the patient's body, or with one from a deceased donor.