excision
Osteoblastoma
Epidemiology
Uncommon
< 1% Primary bone tumour
Young boys
- second decade
Location
Similar to OO
Spine 30%
- especially posterior elements
Long bones 35%
Clinical
Back or limb pain
- pain less severe than OO
Os Acromiale
Definition
Failure of fusion of adjacent ossification centers
Epidemiology
Incidence 3%
Bilateral in 60%
Anatomy
4 ossification centers present in acromion
- pre-acromion
- mesoacromion
- metaacromion
- basiacromion
Schwannoma
Definition
Schwannoma
- benign tumour of nerve sheath
Epidemiology
Less common than neurofibroma
- occurs in adults
- can occur along any peripheral nerve
- also can occur along a nerve root
Usually a large nerve
More common in forearm
Seen in NF 2
- acoustic Schwannoma
Ganglion
Definition
Cystic structure lined by a mature capsule of dense fibrous tissue
- contains thick viscous fluid with a high mucopolysaccharide content
- fluid is a myxoid degeneration of synovial fluid
Epidemiology
Most common in young females
- peak age 15-30
- F:M = 3:1
Most common tumour in hand (2/3)
Aetiology
Unclear
Coccydynia
Definition
Pain in region of coccyx
Epidemiology
Women
- often obese
- mean age 40 years
Aetiology
Fracture
Difficult vaginal delivery
Subluxation / hypermobile coccyx
Anatomy
3 or 4 fused coccygeal vertebrae
Triangular structure