Items tagged “bone”

53 results found
Article

Os acromiale

Os acromiale represents an unfused accessory centre 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 may be bilateral in 60% of individuals 5. Clinical presentation They are usually asymptoma...
Article

Os odontoideum

Os odontoideum 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 congenital lesion due to a ...
Article

Os tibiale externum

An os tibiale externum, also known as an accessory navicular or os naviculare accessorium, 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 asym...
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 tumours 1. Differential diagnosis Their presence is non-specific, as they are seen i...
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 very common, seen in up to 26% of feet 1. Differential diagnosis It should not be mistaken for: os vesalianum ...
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

Os trigonum is one of the bony 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 adults 1. The ossic...
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 bifurcated ligament avulsion fracture of the anterior calcaneal process. Differential diag...
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

An enostosis (pl. enostoses, also known as a "bone island") is a common benign bone lesion, usually seen as an incidental finding. 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’...
Article

Accessory occipital bone sutures

The parietal and occipital bones in particular are common regions for accessory sutures because of their multiple ossification centres. The occipital bone has complex development, ossifying from six centres. The foramen magnum is surrounded by four ossification centres. On each side are the exo...
Case

Severe osteoprosis in a bedridden patient with ESRD

Severe Osteoprosi...
 Diagnosis almost certain
Dr Mohammad Taghi Niknejad
Published 18 Nov 2012
47% complete
X-ray
Case

Adamantinoma of tibia

 Diagnosis almost certain
Dr Vinay Shah
Published 21 Nov 2012
77% 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 tumour 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
Article

Os subfibulare

Os subfibulare is an accessory ossicle that lies at the tip of the lateral malleolus of the ankle and is rarely reported 1. Clinical presentation Os subfibulare are usually asymptomatic although they may eventually cause painful syndromes or degenerative change in response to overuse and traum...

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