Benign Bone Tumor

Question 1

MC BBT of the appendicular skeleton, which is either pedunculated (coat hanger exostosis/ cauliflower like) or sessile

Answer 1

Osteochondroma

Question 2

4 common findings in all BBT

Answer 2

Encapsulated
Short zone of transition
Geographic lesion
Incidental finding

Question 3

Multiple osteochondroma

Answer 3

Hereditary Multiple Exostosis (HME)

Question 4

What percentage of HME becomes malignant

Answer 4

20%

Question 5

Location of Unicameral Bone Cyst (UBC) AKA Simple Bone Cyst (SBC)

Answer 5

Diaphyseal-metaphyseal location, centrally located

It usually occurs at proximal end of bone

Question 6

What condition is associated with fallen fragment sign

Answer 6

Unicameral Bone Cyst

Question 7

UBC MC age

Answer 7

<20

Question 8

Anurysmal Bone Cyst (ABC) location and age

Answer 8

Diaphyseal-metaphyseal, ECCENTRICALLY located, and less than 20 years of age

Question 9

Giant Cell Tumor (GCT) location

Answer 9

Epiphyseal-metaphyseal location

Question 10

MC in 20-40 YO and 20% of the time it’s quasi malignant and associated with soap bubble appearance (saponaceous)

Answer 10

GCT

Question 11

Chondroblastoma location

Answer 11

Epiphyseal-metaphyseal

Question 12

Chondroblastoma age

Answer 12

Less than 20

Question 13

Night pain relieved by aspirin. Radiolucent central nidus with severe reactive sclerosis.

Answer 13

Osteoid Osteoma

Question 14

Night pain relieved by aspirin, appeared like osteoid osteoma

Answer 14

Brodie’s abcess

Question 15

MC BBT of the hand and may have STIPPLED appearance

Answer 15

Enchondroma

Question 16

Multiple enchondroma is known as

Answer 16

Ollier’s disease

Question 17

What percentage of Ollier’s disease has malignant degeneration

Answer 17

10-15%

Question 18

Enchondroma with soft tissue calcification

Answer 18

Mafucci’s syndrome

Question 19

MC BBT of the spina

Answer 19

Hemangioma

Question 20

Appears with vertical striation (corduroy cloth appearance)

Answer 20

Hemangioma

Question 21

Vascular neogenesis

Answer 21

Hmeangioma

Question 22

Bone island, round or oblong radiopaque lesion

Answer 22

Enostoma

Question 23

Multiple bone island

Answer 23

Osteopoikilosis

Question 24

MC BBT to affect neural arch

Answer 24

Osteoblastoma

Question 25

MC BBT to affect the skull, most commonly found in frontal sinus and best seen in Caldwell projection

Answer 25

Osteoma

Question 26

70% monostotic form and 30 % polystotic form. Physiologic resorption of normal bone replaced by fibrous tissue.

Answer 26

Fibrous Dysplasia

Question 27

Monostotic form of fibrous dysplasia is associated with what sign?

Answer 27

RIND sign

Question 28

Causes deformity (SABER SHIN TIBIA and SHEPPARDS CROOK) Ground glass appearance Cafe au lait spots with "Coast of Maine" appearance

Answer 28

Fibrous Dysplasia

Question 29

Familial history, patient presents with scoliosis, cervical kyphosis, vertebral body scalloping with IVF enlargement with cafe au lait with "Coast of California" appearance

Answer 29

Neurofibromatosis