benign bone tumors (BBT)

Question 1

MC BBT of the appendicular skeleton

Answer 1

osteochondroma

PE: sessile or pedunculated

Question 2

multiple osteochondromas is called?

Answer 2

hereditary multiple exostosis

Question 3

fallen fragment sign

Answer 3

simple bone cyst (unicameral bone cyst)

Question 4

what is the difference in location between ABC and simple bone cyst?

Answer 4

ABC: eccentrically located

simple bone cyst: centrally

Question 5

___ BBT arises from a staph infection

Answer 5

brodies abcess

aka Chronic osteomyelitis

Question 6

radiolucent central nidus with severe reactive sclerosis

Answer 6

osteoid osteoma

MC location: femur/ tib

Question 7

Ollier’s disease:___

Answer 7

multiple enchondromas

Question 8

Maffucci’s sx:___

Answer 8

multiple enchondromas with ST Ca+

Question 9

MC spine BBT

Answer 9

hemangioma

Question 10

“corduroy cloth appearance”

Answer 10

hemangioma

Question 11

“bone island”- dont touch lesion

Answer 11

enostoma

incidental findings

Question 12

BBT that effects the posterior elements of the spine (neural arch)

Answer 12

osteoblastoma

Question 13

MC BBT to affect the skull

Answer 13

osteoma

Question 14

“rind sign”

Answer 14

fibrous dysplasia

Question 15

___ BBT: resorption of the normal bone replaced by fibrous tiss

Answer 15

fibrous dysplasia

Question 16

BBT that has vertebral body scalloping with IVF enlargement

Answer 16

NF

Question 17

“coast of maine” BBT
vs.
“coast of california” BBT

Answer 17

coast of maine: Fibrous dysplasia

coast of california: NF