Unit 2

Question 1

What is the pattern destruction found in fibroxanthoma?

Answer 1

geographic w/or w/out surrounding sclerosis

Question 2

Fibroxanthoma is found in what location w/in lower extremity long bones?

Answer 2

metaphyeal, cortical orientation is eccentric femur and tibia
Note: lesions appear to grow

Question 3

What radiographic features are observed w/fibroxanthoma?

Answer 3

Geographic,
eccentric, metaphysis,
lucent (ground glass fibrous mineralization),
cortical expansion (less likely) cortical thinning (more common)
periostitis absent unless recent
Pth fox NOT unusual

Question 4

An occult fracture is suspected in fibroxanthoma. What is the next appropriate action?
If absent what is the correct action?

Answer 4

MRI, if absent Do Not Touch which tend to heal on their own

Question 5

What tumor is known as the Do Not Touch Me Lesions and why?

Answer 5

Fibroxanthoma

note: typically the small lesions because spontaneous regression

Question 6

What complications are seen with fibroxanthoma?

Hint: this more likely to occur with 50 percent or more bone is involved

Answer 6

pathologic fracture

Question 7

What common benign bone lesion occurs prior to second decade of life?

Answer 7

fibroxanthoma

Question 8

What is unique about Fibrosarcoma?

Answer 8

has largest age range
total age range 4-83 
typical range 30-50
ave age 38
no predilection

Question 9

What is a fibrosarcoma?

Answer 9

poor to well differentiated fibrous tissue

not associated w/ cartilage/osteoid matrix

Question 10

What is the MC location for Enchondroma?

What specific location w/in bone?

Answer 10

short tubular bones

metaphysis of long bones

Question 11

What is the mc benign tumor of hand?

Answer 11

Enchondroma

Question 12

An Enchondroma malignancy degenerates into what condition?

Answer 12

Chondrosarcoma

Question 13

What are the signs/symptoms of Enchondroma?

Answer 13

non-painful
fractures are common
enchondromatosis (Ollie’s dz: multiple enchondromas mc in kids in shortened extremities)

Question 14

What are the radiographic features of Enchondroma?

Answer 14

Short bone:well defined
cartilage tumor matrix
geographic destruction
cortical expansion 
possible Endosteal scalloping
Long bones: flocculant Ca
no lucency

Question 15

What is the 2nd mc Benign tumor of the patella

Answer 15

chondroblastoma

Question 16

Codman’s tumor is an aka for what condition?

Answer 16

chondroblastoma

Question 17

ID the mc location of chondroblastoma?

Answer 17

Distal/proximal femur

Knee and shoulder

Epiphysis/Apophysis

Question 18

What lesions are asymptomatic?

Answer 18

fibrosis dysplasia 
SBC
Hemangioma
Paget's (monostotic)
fibroxanthoma (unless fx)
osteoma
mets
Enchondroma

Question 19

What makes an Maffucci’s syndrome?

Answer 19

Enchondromatosis and hemangioma ST vascular tumors