principle

CT Scan

Principle

 

Irradiate a slice of tissue from multiple angles

 

Measure the output from different sides

 

Tissues have different densities

- with denser tissue fewer x-rays reach the detectors

 

Hounsfield scale

 

Bone    2000

ST        40

Water   0

Fat       -100

Air       -1000

MFH

Definition

 

Malignant Fibrous Histiocytoma

 

Characterised by heterogenous population of pleomorphic spindle cells

- organised in a characteristic storiform or "starry night" pattern

 

Cell of origin unknown 

- primitive mesenchymal cell

- allowing both features of a macrophage (hence histiocyte)

- and collagen producing cell (hence fibroblast)

 

Epidemiology

 

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