Items tagged “bone”
66 results found
Article
Os acromiale
Os acromiale is an anatomical variant and represents an unfused accessory center of ossification of the acromion of the scapula.
Epidemiology
Os acromiale is relatively common, seen in ~8% (range 1-15%) of the population 1,2 and can be bilateral in 60% of individuals 5.
Clinical presentation
...
Article
Os odontoideum
Os odontoideum (plural: ossa odontoidea) is an anatomic variant of the odontoid process of C2 and needs to be differentiated from persistent ossiculum terminale and from a type 2 odontoid fracture. It can be associated with atlantoaxial instability.
Although it was originally thought to be a c...
Article
Accessory navicular
An accessory navicular is a large accessory ossicle that can be present adjacent to the medial side of the navicular bone. The tibialis posterior tendon often inserts with a broad attachment into the ossicle. Most cases are asymptomatic but in a small proportion, it may cause painful tendinosis ...
Article
Acetabular foramen
The acetabular foramen is formed by the bony margins of the acetabular notch and completed by the transverse ligament of the hip. From its margins (both transverse ligament and acetabular notch) arises the ligamentum teres. Through it pass nutrient vessels to the femoral head epiphysis.
Article
Fluid-fluid level containing bone lesions
Fluid-fluid level containing bone lesions are best seen on MRI, although with narrow window width they can also be appreciated on CT.
Epidemiology
Their prevalence is estimated at ~3% of bone and soft tissue tumors 1.
Differential diagnosis
Their presence is non-specific, as they are seen in...
Article
Os peroneum
An os peroneum is a small accessory bone of the foot located at the lateral aspect of the cuboid within the substance of the fibularis longus tendon as it arches around the cuboid.
Epidemiology
It is a very common anatomical variant, seen in up to 26% of feet 1.
Differential diagnosis
It sho...
Case
Distal femoral osteosarcoma with pathological fracture
Published
13 Jan 2010
74% complete
Nuclear medicine
MRI
X-ray
Case
Azygos fissure
Published
18 Jan 2010
69% complete
X-ray
Case
Diffuse bony metastases from breast cancer
Published
14 Mar 2010
75% complete
X-ray
Case
Renal osteodystrophy
Published
09 Jul 2010
74% complete
CT
Article
Os trigonum
The os trigonum (plural: ossa trigona) is one of the ossicles of the foot and can be mistaken for a fracture.
It sits posterior to the talus on the lateral foot radiograph and represents a failure of fusion of the lateral tubercle of the posterior process. It is estimated to be present in ~7% ...
Article
Os calcaneus secundarius
An os calcaneus secundarius is an accessory ossicle of the anterior calcaneal process present in up to 5% of the population at cadaveric examination. The ossicle can be a cause of ankle pain and may mimic bifurcate ligament avulsion fracture of the anterior calcaneal process.
Differential diagn...
Article
Bipartite patella
A bipartite patella (two-part patella) is a patella with an unfused accessory ossification center, typically at the superolateral aspect.
Epidemiology
The superolateral accessory ossification center of the patella is usually present by 12 years of age and may persist into adult life. Bipartite...
Article
Bone island
Bone islands, previously known as enostoses, are common benign sclerotic bone lesions that usually represent an incidental finding. When occurring in the head they are called osteomas. Bone islands are considered one of the skeletal “don’t touch” lesions.
Terminology
Enostosis is not a recomme...
Article
Accessory sutures
The parietal and occipital bones in particular are common regions for accessory sutures because of their multiple ossification centers.
It is important to know these anatomic variations, mainly on the head trauma image studies in children, where it could be difficult to differentiate non-depres...
Case
Severe osteoporosis - end-stage renal disease
Published
18 Nov 2012
79% complete
X-ray
Case
Adamantinoma - tibia
Published
21 Nov 2012
74% complete
MRI
Case
Simple bone cyst with pathological fracture
Published
21 Nov 2012
75% complete
X-ray
Case
Giant cell tumor of bone
Published
08 Dec 2012
63% complete
X-ray
Case
Osteopoikilosis
Published
15 Dec 2012
72% complete
X-ray