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