Items tagged “bone”

59 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 are 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 d...
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 located at the lateral plantar aspect of the cuboid within the substance of the peroneus longus tendon as it arches around the cuboid. It is a very common anatomical variant, seen in up to 26% of feet 1. Differential diagnosis It should not be mistaken ...
Case

Distal femoral osteosarcoma with pathological fracture

 Diagnosis almost certain
Dr Angela Byrne
Published 13 Jan 2010
74% complete
X-rayNuclear medicineMRI
Case

Azygos fissure

 Diagnosis certain
A.Prof Frank Gaillard
Published 18 Jan 2010
69% complete
X-ray
Case

Diffuse bony metastases from breast cancer

Diffuse Breast Ca...
 Diagnosis almost certain
Dr Hani Salam
Published 14 Mar 2010
57% complete
X-ray
Case

Renal osteodystrophy

 Diagnosis almost certain
Dr Hani Salam
Published 09 Jul 2010
70% complete
CT
Article

Os trigonum

The os trigonum (plural: os 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% of...
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 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. Prevalence of a bipa...
Article

Enostosis

Enostoses, also known as bone islands, are common benign sclerotic bone lesion which usually represent incidental findings. They constitute a small focus of compact bone within cancellous bone. Enostoses can be seen on radiographs, CT, and MRI, and are considered one of the skeletal “don’t touch...
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 osteoprosis in a bedridden patient with ESRD

Severe Osteoprosi...
 Diagnosis almost certain
Dr Mohammad Taghi Niknejad
Published 18 Nov 2012
44% complete
X-ray
Case

Adamantinoma - tibia

 Diagnosis almost certain
Dr Vinay Shah
Published 21 Nov 2012
74% complete
MRI
Case

Simple bone cyst with pathological fracture

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 Diagnosis almost certain
Dr Mohammad Taghi Niknejad
Published 21 Nov 2012
66% complete
X-ray
Case

Giant cell tumor of bone

Lateral view
 Diagnosis probable
Dr Mohammad Taghi Niknejad
Published 08 Dec 2012
57% complete
X-ray
Case

Osteopoikilosis

 Diagnosis almost certain
Dr Mohammad Taghi Niknejad
Published 15 Dec 2012
72% complete
X-ray

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