Mod 6

Question 1

CATBITES stands for?

Answer 1

Congenital
Arthritis
Trauma
Blood
Infection
Tumour
Endocrine/metabolic/nutritional
Soft tissue

Question 2

Types of tumours?

Answer 2

Benign and malignant

Question 3

Types of malignant tumours?

Answer 3

Primary (30%)

Secondary aka metastasis (70%)

Question 4

What is used in imaging tumours?

Answer 4

Initially plain film / digital imaging

Question 5

10 determinants of lesion aggressiveness?

Answer 5

Age of patient
ST involvement
Pattern of destruction
Size of lesion
Location of lesion
Zone of transition
Margination of lesion
Presence of visible tumour matrix
Host response
Monostotic or polystotic

Question 6

M.C Malignant osseous lesion in <1 yoa

Answer 6

Usually metastatic neuroblastoma

Question 7

M.C tumour in 1-30 yoa

Answer 7

osteosarcoma or Ewing’s sarcoma

Question 8

m.c tumour in 30-60 yoa

Answer 8

chondrosarcoma, primary lymphoma, or malignant fibrous histiocytoma

Question 9

m.c. tumour in >50

Answer 9

metastatic disease or multiple myeloma

Question 10

Benign tumours are more common in (old/young)?

Answer 10

young

Question 11

Malignant tumours are more common in (old/young)?

Answer 11

old

Question 12

What does a soft tissue mass indicate?

Answer 12

Primary malignant tumour or infection

Question 13

What does the absence of a ST mass indicate?

Answer 13

Benign or metastasis

Question 14

Types of osteolytic lesions (3)

Answer 14

Geographic (least aggressive; benign or infection)
Moth-eaten (more aggressive; malignant or infection)
Permeative (most aggressive; malignant)

Question 15

Types of osteoblastic lesions (2)

Answer 15

Diffuse ivory-like

localized (snowball)

Question 16

In terms of size of lesion, what size is more likely to be malignant or aggressive?

Answer 16

> 5cm (but this is a poor predictor, and there are many exceptions)

Question 17

Benign lesions size/shape?

Answer 17

slow growing- along axis of bone- long lesion in a long bone
most are <6cm
(poor predictors)

Question 18

Agressive lesion size/shape?

Answer 18

rapid growing- no definitive shape- amorphous
any size
(poor predictors)

Question 19

Sclerotic margin with narrow transition zone suggests?

Answer 19

non-aggressive

Question 20

Non sclerotic margin with wide zone of transmission suggests?

Answer 20

aggressive

Question 21

Aggressive bone-forming tumours produce?

Answer 21

amorphous osteoid which is often less dense than normal bone

Question 22

Less aggressive bone-forming tumours produce?

Answer 22

better organized, denser bone

Question 23

Cartilage producing tumours are:

Answer 23

distinctive, stippled and more dense than normal bone

Question 24

An host will respond quickly to aggressive lesions (T/F)

Answer 24

F- no time to respond; cortical destruction; penetration of ST; with or without periosteal rxn

Question 25

Types of interrupted periosteal response

Answer 25

Laminated
Spiculated
Codman’s Tirangle