103 results
Article
Double density sign (disambiguation)
The double density sign can refer to several radiological signs:
double density sign (left atrial enlargement)
double density sign (berry aneurysm)
double density sign (osteoid osteoma)
Article
Sclerotic skull lesion
Sclerotic skull lesion can result from a number of causes. They include:
hyperostosis frontalis interna (normal variant)
osteoma
fibrous dysplasia
meningioma-associated
calvarial metastasis
See also
lytic skull lesions
calvarial thickening
calvarial thinning
Article
Sacral lesions
A very wide range of lesions can occur in and around the sacrum.
Tumors
primary sacral tumors
malignant
sacral chordoma: most common primary sacral tumor 1
chondrosarcoma
Ewing sarcoma / pPNET
osteosarcoma: often arises from Paget disease in this location
multiple myeloma/plasmacytoma
...
Article
Gnathic osteosarcoma
Gnathic osteosarcoma is a subtype of osteosarcoma that primarily affects the mandible (horizontal ramus) and maxilla (alveolar ridge, sinus floor, and palate).
Epidemiology
represents ~6% of osteosarcomas 3
60% in males
has an older onset (~30 years) and a peak incidence: 30-40 years
Clini...
Article
Intraosseous meningioma
Intraosseous meningioma, also referred to as primary intraosseous meningioma, is a rare subtype of meningioma that accounts for less than 1% of all osseous tumors. They are the most common type of primary extradural meningiomas 6.
Terminology
It is important to note that it has been argued by ...
Article
Idiopathic osteosclerosis of the mandible
Idiopathic osteosclerosis of the mandible is a common incidental finding on dental imaging.
Terminology
Idiopathic Osteosclerosis is also known as dense bone islands, enostoses, bone scar, bone whorl or focal periapical osteopetrosis 1,2,3.
Idiopathic osteosclerosis is the preferred terminolo...
Article
Button sequestrum
A button sequestrum is a small sequestrum of devascularised bone surrounded by lucency. Although classically described in osteomyelitis and eosinophilic granuloma it is also occasionally seen in fibrosarcoma and lymphoma.
Differential diagnoses
osteoid osteoma
tuberculous osteomyelitis
radi...
Article
Clavicle tumors
Clavicle tumors may be malignant or benign.
Malignant
metastases
prostate
breast
cervix
ovary
urinary bladder
carcinoid
osteosarcoma
osteosarcoma
lymphoma
primary
metastatic
Benign
osteoma: uncommon, sclerotic, hamartomatous surface lesion
enchondroma: rare, geographic, intramedu...
Article
Choroidal hemangioma
Choroidal hemangiomas are benign vascular hamartomatous tumors of the choroid.
They present in two forms based on the extent of choroidal involvement:
circumscribed choroidal hemangioma (CCH): solitary tumor with no systemic associations
diffuse choroidal hemangioma (DCH): usually in associat...
Article
Familial adenomatous polyposis
Familial adenomatous polyposis syndrome (FAPS) is characterized by the presence of hundreds of adenomatous polyps in the colon. It is the most common of the polyposis syndromes.
Terminology
Familial polyposis coli and attenuated familial adenomatous polyposis are variants of the same disease a...
Article
Bullough lesion
Bullough lesions, or Bullough's bumps, are protuberant fibro-osseous lesions of the temporal bone, involving the external mastoid surface.
Epidemiology
Only a handful of case reports are available since it was first described in 1999 1-4.
Pathology
These lesions feature a bland fibrous strom...
Article
Bony sequestrum (mnemonic)
Mnemonics to help remember common causes of bony sequestrum include:
E-FILM
LIFE
FILE
Mnemonics
E-FILM
E: eosinophilic granuloma
F: fibrosarcoma
I: infection (Brodie abscess)
L: lymphoma (skeletal)
M: malignant fibrous histiocytoma or metastasis (especially from breast carcinoma)
LI...
Article
External auditory canal
The external auditory canal (EAC) or external auditory meatus (EAM) extends from the lateral porus acusticus externus medially to the tympanic membrane.
Terminology
As the term external auditory meatus is variably used to refer to the canal itself or the porus acusticus externus (the round lat...
Article
Technetium 99m-methyl diphosphonate
Technetium 99m-methyl diphosphonate (99mTc MDP) is a radiotracer used in nuclear medicine especially for bone scintigraphy. Any disease process which results in extracellular fluid expansion will lead to accumulation of this tracer.
Radionuclide profile
photon energy: 140 keV
physical half-li...
Article
Dystrophic soft tissue calcification
Dystrophic soft tissue calcification is a type of soft-tissue calcification, which occurs in damaged or necrotic tissue, while the serum level of calcium and phosphorus are normal. It may progress to ossification, in which case a cortical and trabecular bone pattern is visible.
An often cited a...
Article
Frontoethmoidal mucocele
A frontoethmoidal mucocele is a paranasal sinus cyst-like lesion (mucocele) lined with respiratory mucosa. The frontal and frontoethmoidal regions are reportedly the most common locations for paranasal sinus mucocele formation 1. They are thought to arise from obstruction of normal sinus drainag...
Article
Diffuse dural calcification
Diffuse dural calcification can occur in a number of settings. These include:
parathyroid abnormalities
hyperparathyroidism
secondary hyperparathyroidism 2
tertiary hyperparathyroidism 3,6
nephrogenic systemic fibrosis 1
congenital syndromes
basal cell nevus syndrome
Differential diagnos...
Article
Bone marrow edema
Bone marrow edema is the term given to abnormal fluid signals seen within the bone marrow on MRI. It is a non-specific yet important imaging finding, usually indicating the presence of underlying pathology.
Terminology
The term edema was coined on MRI as the signal in abnormal bone marrow is s...
Article
Fibrous cortical defect (historical)
Fibrous cortical defects (FCD) is a previously used term to describe non-ossifying fibromas smaller than 2-3 cm. Non-ossifying fibroma is now the recommended term per the WHO classification of soft tissue and bone tumors (5th edition) 6.
In the popular mnemonic for lucent bone lesions FEGNOMASH...
Article
Solitary sclerotic bone lesion
Solitary sclerotic bone (osteosclerotic or osteoblastic) lesions are lesions of bone characterized by a higher density or attenuation on radiographs or computer tomography compared to the adjacent trabecular bone. However, a specific density range has not been specified for those terms 1.
Diffe...
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