Bone

Question 1

Geographic 1A bone lesions

2 cystic, 3 cartilage, 2 fibrous

Answer 1

Bone cyst
Brodie abscess

Chondroblastoma
Chondromyxoid fibroma
Enchondroma

Fibroxanthoma
Fibrous dysplasia

Question 2

Geographic 1B bone lesions - well def non scler margin

2 cystic, 3 cartilage, 1 fibrous, 2 malig

Answer 2

Giant cell tumor
Bone cyst

Cartilage lesions:
Chondroblastoma
Chondromyxoid fibroma
Enchondroma

Fibrous dysplasia

Myeloma / Mets

Question 3

Geographic 1C lesion - ill defined margin

2 cysts, 2 cartilage, 3 primary, 2 secondary malig

Answer 3

GCT
ABC

Chondromyxoid fibroma
Enchondroma - active

Osteosarcoma
Chondrosarcoma
Fibrosarcoma / malignant fibrous histiocytoma

Myeloma / Mets

Question 4

Moth eaten / permeative lesions DDx
1 infec, met
5 primary bone lesions
2 secondary

Answer 4

Osteomyelitis
Metabolic bone disease - permeative mainly

Osteosarcoma
Fibrosarcoma / MFH

LCH
Round blue cell tumors
Ewings

Myeloma / Mets

Question 5

Types of periosteal reactions
4 benign
4 malignant

Answer 5

Benign:
Solid
Buttressing
Expansion
Septations

Malignant:
Codman triangle
Hair on end
Sunburst
Laminated

Question 6

Polyostotic benign lesions

2 + + 2 + 2 + 2

Answer 6

Enchondromatosis
HME

Fibrous dysplasia
Pagets

Osteomyelitis
LCH - beveled edge in skull

NF1
Angiomatos lesions

Question 7

Polyostotic malignant lesions

Aggressive multiple holes

Answer 7

Mets
Multiple myeloma
Hemangioendothelioma

Question 8

Blastic bone Mets

Answer 8

Prostate
Breast

Mucinous GI tumors
Carcinoid
TCC of bladder
Lymphoma