differential

DDx Soft tissue calcification

Hemangioma (commonest)

AV Malformation

Synovial sarcoma

Chondrosarcoma

MO / HO

Eptheloid sarcoma

TB calcified LN

Xray

Calcification

- central pattern

- often increased opacity compared with bone

Ossification

- peripheral pattern

- similar density to bone

Definition

Twisted / Wry neck secondary to fibromatosis in sternocleidomastoid

Epidemiology

Packaging defect

- commonest first born 

- 75% on right

Associations

CDH 20%

Metatarsus adductus 15%

Breech presentation

Klippel - Feil Syndrome

Arthrogryposis

Aetiology

Fibrosis of SCM on one side

Epidemiology

Uncommon

- 4% OS

Females more common 

- similar to GCT

NHx

Less aggressive locally

- less metastasis

- size / location & duration of symptoms don't correlate with outcome

Arise from cortex of bone / periosteum

- parosteal 

- periosteal

- high grade juxtacortical

It was described in 1983 by Dr. Nora, and is sometimes called Nora's disease or Nora's lesion

Definition

Bizarre parosteal osteochondromatous proliferation 

Epidemiology

Rare lesion 

- occurs most commonly in the hands and feet

Adults in their 20's and 30's

Males = Females

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