SA Orthopedic Neoplasia

Question 1

What are the criteria for an aggressive lesion?

Answer 1

At least one of the following:
1. Ill defined margin (long zone of transition)
2. Cortical lysis
3. Irregular periosteal proliferation

Question 2

Aggressive v non-aggressive?

Answer 2

Non-aggressive
Osteochondrosis

Question 3

Aggressive v non-aggressive?

Answer 3

Aggressive
Long zone of transition, ill-defined

Question 4

Aggressive v non-aggressive?

Answer 4

Aggressive
Cortical lysis

Question 5

Aggressive v non-aggressive?

Answer 5

Aggressive
Cortical lysis

Question 6

Answer 6

Smooth periosteal proliferation
Nonaggressive

Question 7

Answer 7

Smooth periosteal proliferation
Nonaggressive

Question 8

Answer 8

Irregular periosteal proliferation
Aggressive

Question 9

Answer 9

Irregular periosteal proliferation
Aggressive

Question 10

Answer 10

Periosteal proliferation
Irregular, columnar

Question 11

Answer 11

Periosteal proliferation
Irregular, spiculated

Question 12

Answer 12

Periosteal proliferation

Question 13

Answer 13

Periosteal proliferation

Question 14

Define: Codman Triangle

Answer 14

Periosteum is lifted by the mass
Triangle of smooth bone formed under periosteum
Can occur with any fast growing lesion (usually neoplasia)

Question 15

Answer 15

Question 16

How would you describe this?

Answer 16

Large, well-defined region of lysis

Question 17

How would you describe this?

Answer 17

Moth-eaten lysis
Medium to small patches of lysis

Question 18

How would you describe this?

Answer 18

Permeative bone lysis
Small or pinpoint foci of lysis

Question 19

What is the most common primary bone tumor in dogs?

Answer 19

Osteosarcoma

Question 20

What is the site predilection for osteosarcoma?

Answer 20

“Flee the elbow, seek the knee”

Question 21

Answer 21

Primary bone tumor

Question 22

Answer 22

Primary bone tumor

Question 23

Answer 23

Primary bone tumor

Question 24

Answer 24

Primary bone tumor

Question 25

What does metastatic neoplasia look like radiographically?

Answer 25

Usually lytic

Question 26

Answer 26

Carcinoma metastasis

Question 27

Answer 27

Carcinoma metastasis

Question 28

Answer 28

Sclerotic carcinoma metastasis (unusual

Question 29

Answer 29

Multiple myeloma (multicentric)

Question 30

Answer 30

Multiple myeloma (multicentric)

Question 31

What are some hints that a soft tissue neoplasia is invading bone?

Answer 31

Multiple bones involved with one lesion
Joint space crossed

Question 32

Answer 32

Soft tissue neoplasia invading bone

Question 33

Answer 33

Soft tissue neoplasia invading bone

Question 34

Answer 34

Osteosarcoma
Lung-digit syndrome (metastasis from lung)

Question 35

Answer 35

Osteomyelitis associated with an implant

Question 36

Answer 36

Fungal osteomyelitis

Question 37

What would lead you towards fungal myelitis as compared to neoplasia?

Answer 37

Young to middle aged
Travel history
Other sites of infection or systemic illness
Diaphysis
Multiple bones

Question 38

Answer 38

Hypertrophic osteopathy

Question 39

Answer 39

Benign bone cysts
Nonaggressive

Question 40

Aggressive or nonaggressive?

Answer 40

Nonaggressive

Question 41

Aggressive or nonaggressive?

Answer 41

Aggressive

Question 42

Aggressive or nonaggressive?

Answer 42

Nonaggressive

Question 43

Aggressive or nonaggressive?

Answer 43

Nonaggressive

Question 44

Aggressive or nonaggressive?

Answer 44

Aggressive

Question 45

Traumatic or pathologic?

Answer 45

Pathologic

Question 46

Traumatic or pathologic?

Answer 46

Pathologic

Question 47

Traumatic or pathologic?

Answer 47

Traumatic

Question 48

Acute or chronic?

Answer 48

Chronic
Hypertrophic, nonunion

Question 49

Acute or chronic?

Answer 49

Chronic