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Calcaneocavus

Definition

 

Deformity characterised by 

- dorsiflexion of calcaneus 

- plantarflexion of forefoot / plantaris / forefoot equinus

 

Both sides of foot have elevated arch

 

Aetiology

 

Weakness of triceps surae 

- polio - most common worldwide

- spina bifida

 

Liposarcoma

Definition

 

STS composed of malignant lipoblasts

 

Epidemiology

 

Common 

- 10% of STS

- second only to MFH

 

Occurs almost exclusively in adults

 

Males age 40-60

 

Can be multiple origin -> examine patient

 

Rarely arise from lipoma

 

Parosteal Osteosarcoma

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

 

Multiple Myeloma

Definition

 

Uncontrolled proliferation of single clone of plasma cells

 

Epidemiology

 

Most common malignant tumour of bone

 

Age 50-60

 

2-3 / 100 000

 

Pathology

 

Highly differentiated B lymphocytes

- associated with abnormality of protein synthesis

 

Usually bone marrow of entire skeleton involved

 

Ewing Sarcoma

Principles

 

Treatment algorithm similar to OS

 

Overall prognosis similar to OS

- 70% long term survival

 

Definition

 

A malignant neoplasm composed of small round cells of uncertain histogenesis

 

Genetics

 

Recent data suggests it is of neuroepithelial derivation

- ? neuroectodermal cells

Chondrosarcoma

Definition 

 

Malignant cartilage producing tumour 

 

Epidemiology

 

20% of primary bone tumours

 

3rd most common

- 1 in 500 000

 

Relatively non-aggressive / usually Grade I

 

Average age 40

 

Male > Females

 

Two Distinct Types

 

1.  Primary Chondrosarcoma

 

Arises de novo

Osteoid Osteoma

Definition

 

Benign, bone-forming neoplasm

- characterized by a small nidus of neoplastic tissue

- surrounded by a wide zone of mature, reactive bone

 

Epidemiology

 

10% of benign bone tumours

Age 5-25

M:F 2:1

 

Aetiology

 

Unknown

- thought may be glomus tumour of bone

 

Pain secondary to prostaglandin production

 

Nora lesion

 

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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