Iscan Staging (Sternal End of 4th Rib)

Question 1

what age corresponds to phase 0?

Answer 1

<17

Question 2

what age corresponds to phase 1?

Answer 2

17-19

Question 3

what age corresponds to phase 2?

Answer 3

20-23

Question 4

what age corresponds to phase 3?

Answer 4

24-28

Question 5

what age corresponds to phase 4?

Answer 5

26-32

Question 6

what age corresponds to phase 5?

Answer 6

33-42

Question 7

what age corresponds to phase 6?

Answer 7

43-55

Question 8

what age corresponds to phase 7?

Answer 8

54-64

Question 9

what age corresponds to phase 8?

Answer 9

> 64

Question 10

describe phase 0

Answer 10

Flat or billowy surface
Regular rim, rounded edges
The bone is smooth, firm and solid

Question 11

describe phase 1

Answer 11

Surface shows beginning of amorphous indentation, billowing still present
Rim rounded and rectangular, scalloping may appear at the edges
Bone firm, smooth and solid

Question 12

describe phase 2

Answer 12

Surface has developed a deeper pit, anterior and posterior walls form v-shaped appearance
Thick and smooth walls with scalloped or slightly wavy rim and rounded edges
Gradual loss of smoothness

Question 13

describe phase 3

Answer 13

Pit deepens and is U-shaped
Walls still thick with rounded edges, some scalloping but rim becomes more irregular
Bone quite firm and solid

Question 14

describe phase 4

Answer 14

Depth of pit increasing, yet retaining narrow to moderate U-shape
Walls become thinner, but edges remain rounded, rim becoming more irregular, losing uniform scalloping pattern
Bone loses weight and firmness

Question 15

describe phase 5

Answer 15

Little changes to depth of pit, moderately wide U-shape
Thinning of the walls continues with edges becoming sharp, rim gets increasingly irregular, no more scalloping but irregular bony projections instead
Bone begins to slightly deteriorate, showing porosity and loss of density

Question 16

describe phase 6

Answer 16

Deep pit with wide U-shape
Walls thin with sharp edges, irregular rim with rather long bone projections, often more pronounced at superior and inferior borders
Bone is becoming lighter, thinner and more porous, especially inside the pit

Question 17

describe phase 7

Answer 17

Deep pit with wide to very wide U-shape
Walls thin and fragile, sharp and irregular edges with bony projections
Bone is light, brittle and porous

Question 18

describe phase 8

Answer 18

Pit very deep with wide U-shape, floor may be absent or filled with bony projections
Walls extremely thin, fragile and brittle, may show formation of windows
Edges highly irregular with bony projections
Bone is brittle, very light, friable and porous