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Flashcards in Benign Tumors Deck (75)
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1

T/F: Bone islands typically do not appear "hot" on bone scans

TRUE

2

are composed of
cortical bone, and appear as low
signal intensity on MRI on all
pulse sequences

bone islands

3

typically appear as round-to-ovoid sclerotic intramedullary foci

bone island

4

Cortical bone that has failed to undergo medullary
resorption during the process of endochondral
ossification

Bone Island: (Enostoma)

5

– Located anywhere, except in skull – Discrete area of sclerosis in bone – Asymptomatic and clinically insignificant

Bone Island (BI): (Enostoma)

6

distinguishes BI from blastic metastasis

Brush border

7

– Age 10-25 yo – Pain relieved by Aspirin – Gradual severe deep aching pain – Pain could be referred to a nearby joint – Pain worse at night – Limited ROM, painful limp, stiffness, weakness

Osteoid Osteoma

8

– Painful rigid scoliosis: usu on concave side
of curve – 50% in tibia and femur – 10% in spine affecting posterior elements

Osteoid Osteoma

9

– Usu <1.0 cm in size – Radiolucent nidus with surrounding reactive
sclerosis – Nidus may calcify

osteoid osteoma

10

Highly vascularized fibrous connective tissue

nidus (tumor)

11

T/F: May need CT & Bone Scan for spinal lesions

TRUE

12

– DDX:
• Spondylolysis
• Congenital agenesis of contralateral pedicle
• Osteoblastoma
• Blastic metastasis
• Brodie’s abscess
• Stress Fracture
• Garre’s Chronic Sclerosing Osteomyelitis

osteoid osteoma

13

– DDX:
• Blastic metastasis • Osteoid osteoma • Osteoma • Osteopoikilosis

Bone Island: (Enostoma)

14

• Pain is relieved by aspirin and nonsteroidal anti-
inflammatory drugs • Very high levels of prostaglandins have been found in the
lesion

Osteoid Osteoma

15

– Aspirin also relieves pain – Pain worse at night – Nidus >1.0 cm in size – No angiographic vascular blush

Brodie’s Abscess

16

Osteoid Osteoma tx:

NSAIDS until pain subsides
Thermocoagulation (92% case success)

17

An insulated SMK C-15 electrode was inserted through
the cannula into the lesion and its position confirmed by
CT imaging

THERMOCOAGULATION

18

– Peak age range 10-20 yo – Usually located in posterior neural arch of spine – Pain, that is usually not at night, and not relieved by aspirin

Osteoblastoma

19

– Painful scoliosis – 2-10 cm in size – Expansile lesion with eggshell-thin cortical margin – May be sclerotic

Osteoblastoma

20

T/F: Small percentage of osteoblastomas become malignant

TRUE

21

shows fluid in MRI: T1 or T2

T2

22

– Arises from residual islands of cartilage left in metaphysis
as physis grows away – Hands (50%) and feet

Solitary Enchondroma

23

mc location solitary enchondroma

hand

24

solitary enchondroma: Sudden onset of pain without trauma signals _______

malignant transformation

25

50% have punctate calcification due to
cartilagenous matrix

Solitary Enchondroma

26

Post trauma introduction of epidermoid tissue into bone

Inclusion cyst

27

Neuroarterial lesion in hand causing pressure erosion of tuft

Glomus tumor

28

if surgery... Replace with bone chips, or cement packing (calcium
phosphate packing)

Solitary Enchondroma

29

Enchondroma with malignant transformation to a

Chondrosarcoma

30

T/F: Solitary Enchondroma is more likely malignant if hot on bone scan

TRUE