Chiari malformations - Radiopaedia.org
2022年10月22日 · Chiari malformations are a group of defects associated with congenital caudal 'displacement' of the cerebellum and brainstem. Initial descriptions were based on autopsy observations. Three types were described, with others added later. Types II and III are thought to be related to each other while type I represents a distinct entity 1.
Chiari I malformation - Radiopaedia.org
2024年8月12日 · Chiari I malformation is the most common variant of the Chiari malformations and is characterized by a caudal descent of the cerebellar tonsils (and brainstem in its subtype, Chiari 1.5) through the foramen magnum. Symptoms are proportional to the degree of descent. MRI is the imaging modality of choice.
Arnold-Chiari Malformation - StatPearls - NCBI Bookshelf
2023年9月4日 · Fetal sonography, often during the second-trimester anatomy scan, demonstrates the typical imaging features of Chiari II and III malformations. One classic imaging finding on ultrasound is the lemon sign of the anterior frontal calvarium, with loss of the normal convex curvature and flattening or inward bowing/scalloping that results in a shape ...
Chiari Malformation: What It Is, Symptoms, Types & Treatment
A Chiari malformation is a structural abnormality in your skull that causes part of your brain to move into your spinal canal. You may have mild or severe symptoms or no symptoms at all. It usually causes headaches and difficulty with balance and coordination, as it affects your cerebellum. Surgery may help.
Chiari malformation - Symptoms and causes - Mayo Clinic
2023年10月20日 · Chiari malformation type 2 is usually noted with ultrasound during pregnancy. It also may be diagnosed after birth or in early infancy. Chiari malformation type 3. Chiari malformation type 3 is the most serious type of the condition.
Chiari Malformation Type 2 - StatPearls - NCBI Bookshelf
2024年2月25日 · If fetal ventriculomegaly is present, Chiari 2 malformation can be detected with fetal ultrasound in some cases. In addition to the characteristic features of cerebellar vermis, brainstem, and fourth ventricle caudal displacement, the following findings may also be present:
Imaging in Chiari I Malformation - Neurosurgery Clinics
Often found incidentally or in the context of related clinical symptoms, Chiari I Malformation entails inferior descent of the cerebellar tonsils 5 mm or greater below the foramen magnum. Brain MRI offers optimal visualization of the cerebellar tonsils and local anatomy, whereas spine MRI may reveal the presence of syringomyelia or scoliosis.
Diagnosing and Treating Chiari Malformation
Chiari malformations can be difficult to diagnose, since the symptoms can be vague, or there may be no symptoms at all. A definitive diagnosis is generally made after an MRI scan, where the abnormal protrusion of the cerebellum toward the spinal cord can be seen.
Intraoperative Ultrasound in Chiari Type I Malformation
2020年6月10日 · It is possible to use intraoperative USG in patients with Chiari malformation type I as a method for selection of candidates for posterior fossa decompression with bone removal alone. This chapter describes the authors’ experience using intraoperative USG.
Often found incidentally or in the context of related clinical symptoms, Chiari I Malformation entails inferior descent of the cerebellar tonsils 5 mm or greater below the foramen magnum. Brain MRI offers optimal visualization of the cerebellar tonsils and local anatomy, whereas spine MRI may reveal the presence of syringomyelia or scoliosis.