Items tagged “refs”
2,969 results found
Article
Hyperostosis frontoparietalis
Hyperostosis frontoparietalis is a variant of the more common and more well known hyperostosis frontalis interna. As the name suggests, there is benign overgrowth exclusively of the inner table of the frontal bones and parietal bones. Characteristic features include sparing of the midline and ou...
Article
Hyperostosis of the skull (differential)
Hyperostosis of the skull has many causes, broadly divided into focal or diffuse.
Diffuse
Paget disease of bone
metastatic disease, especially prostate carcinoma
chronic, severe anemia
hyperparathyroidism
acromegaly
osteopetrosis
hyperostosis frontalis interna
long-term phenytoin use
g...
Article
Hypertrophic olivary degeneration
Hypertrophic olivary degeneration (HOD) is a rare condition characterized by a unique pattern of trans-synaptic degeneration. Typically it is caused by a lesion in the brainstem/cerebellum interrupting the triangle of Guillain and Mollaret, resulting in hypertrophy of the inferior olivary nucleu...
Article
Incus
The incus (plural: incudes) is the middle of the three ossicles articulating with the head of the malleus anteromedially, forming the incudomalleolar joint, and the stapes inferomedially, forming the incudostapedial joint.
Gross anatomy
Four parts of the incus are named:
body
contiguous with...
Article
Intracranial arteries (variants)
Intracranial arterial variants, of which there are many, are collectively common. Their clinical significance may be variable but knowledge and recognition of these variants is fundamental, especially if surgical or endovascular treatments (e.g. for acute stroke, aneurysms or other vascular path...
Article
Intracranial hemorrhage
Intracranial hemorrhage (ICH) is a collective term encompassing many different conditions characterized by the extravascular accumulation of blood within different intracranial spaces. A simple categorization is based on location:
intra-axial hemorrhage
intracerebral hemorrhage
basal ganglia ...
Article
Intraosseous ganglion
Intraosseous ganglion cysts, intraosseous ganglia or juxta-articular bone cysts are benign tumor-like non-neoplastic lesions occurring in the subchondral regions of bone in the absence of degenerative or inflammatory arthritis 1,2.
Epidemiology
Intraosseous ganglion cysts tend to occur in mid...
Article
Kerr kink
The Kerr kink is a sign of renal tuberculosis. Scarring in the adjacent tissues due to chronic inflammation leads to a sharp kink at the pelviureteric junction (PUJ).
History and etymology
William "Bill" K Kerr, a Canadian urologist, described his eponymous sign in 1967 3.
Article
Glenoid labrum variants
There are a number of glenoid labral variants, whose importance is mainly due to the fact that the unwary may misinterpret them as pathology (e.g. Bankart lesion or labral tear). These include:
Buford complex
sublabral foramen
superior sublabral sulcus
pseudo-SLAP lesion
Article
Labyrinthine artery
The labyrinthine artery, also known as the auditory artery or internal auditory artery, is a long and slender artery that is the main arterial supply to the vestibular apparatus and cochlea. It also vascularizes the VII and VIII cranial nerves.
It usually originates from the AICA (~85%), althou...
Article
Large intestine
The large intestine (also known as the large bowel) is a 1.5 meter muscular tube that extends from the cecum to the rectum. It has three outer longitudinal muscular layers called taenia coli, which are about 30 cm shorter than the length of the large bowel causing characteristic sacculations int...
Article
Superior orbital fissure (mnemonic)
A mnemonic for all structures passing through the superior orbital fissure (superior to inferior) is:
Long Fissures Seem To Store Only Nerves, Instead Of Arteries, Including Ophthalmic Veins
Mnemonics for the nerves passing through the superior orbital fissure include:
Lazy French Tarts Sit N...
Article
Lead poisoning
Lead poisoning or plumbism refers to the multi-organ toxicity exerted by exposure to lead. Manifestations differ based on a myriad of features including chronicity, exposure intensity, and age. Neurologic toxicity and hematologic toxicity are common features. Clinical manifestations vary, rangin...
Article
Limbus vertebra
A limbus vertebra is a well-corticated unfused secondary ossification center of the vertebral body, usually of its anterosuperior corner, that occurs secondary to herniation of the nucleus pulposus through the vertebral body endplate beneath the ring apophysis (see ossification of the vertebrae)...
Article
AAST liver injury scale
The AAST (American Association for the Surgery of Trauma) liver injury scale, revised in 2018, is the most widely used liver injury grading system 3.
The 2018 update incorporates "vascular injury" (i.e. pseudoaneurysm, arteriovenous fistula) into the imaging criteria for visceral injury 3.
Cla...
Article
Low endplate signal on T1
Several conditions may give vertebral endplate T1 low signal on MRI. They include:
ankylosing spondylitis
vertebral metastases
disc infection
haemodialysis
Article
Lower lobe bronchiectasis
The distribution of bronchiectasis can help in narrowing the differential diagnosis. Lower lobe bronchiectasis is the commonest zonal predilection in bronchiectasis 2. It is mostly idiopathic but can be typically seen in
post infective bronchiectasis
recurrent childhood infections
aspiration
...
Article
Lymphocytic hypophysitis
Lymphocytic hypophysitis is an uncommon non-neoplastic inflammatory condition that affects the pituitary gland. It is closely related to other inflammatory conditions in the region, namely orbital pseudotumor and Tolosa-Hunt syndrome.
Epidemiology
Lymphocytic hypophysitis is seen most frequent...
Article
Radiolucent lesions of the mandible (differential)
Lucent lesions of the mandible are not uncommon and may be the result of odontogenic or non-odontogenic processes. Lucency may be conferred by a cystic process (e.g. periapical cyst) or a lytic process (e.g. mandibular metastases).
Pathology
Etiology
Odontogenic
periapical (radicular) cyst (...
Article
Mitochondrial encephalomyopathy with lactic acidosis and stroke-like episodes (MELAS)
Mitochondrial encephalomyopathy with lactic acidosis and stroke-like episodes (MELAS) is one of many mitochondrial disorders. As mitochondria, which have their own DNA, are exclusively passed on from the mother these disorders are only maternally inherited.
On imaging, it manifests as multifoca...