Benign Bone tumors- Fibrous/cystic/misc

Question 1

Types of benign bone tumors of fibrous origin

Answer 1

1. Non ossifying fibroma (fibrous cortical defect smaller version)
2. Fibrous dysplasia

Question 2

Non ossifying fibroma (age, pain, loc, border/matrix)

Answer 2

age- children (8-20)- fibrous cortical defect younger

pain- no

Loc- cortex of metaphysis (LL)

imaging- well defined with sclerotic boder w/ lucent/SOAPY matrix

Question 3

Fibrous dysplasia- age, pain, loc, border/matrix

Answer 3

age- children/young adults

Pain- painless

Loc- diametaphyseal region of medullary bone

Imaging- well defined with lytic/ground glass/smokey look

Question 4

What are the 3 forms of fibrous dysplasia

Answer 4

1. Monostotic (m/c)
2. Polyostotic
3. Polyostotic with endrocrine abnormalities (mccure albright syndrome- brown spots on skin)

Question 5

What are the cycstic lesions (2)

Answer 5

1. Simple bone cyst

2. Aneurysmal bone cyst

Question 6

Simple bone cyst- Age, pain, loc, margin/matrix

Answer 6

Age- 8-14

Pain- no

Loc- central medullary cavity of metaphysis (humerus + prox femur mc)

Imaging- well defined, thin sclerotic rim, radiolucent+ septated

Question 7

Aneruysmal bone cyst- age, pain, loc, margin/matrix

Answer 7

age- 5-20

Pain- yes (growing quick)

Loc- cortex of metaphysis

Imaging- well defined, expansile balooned out appearence, lucent/Soapy, not much slerosis

Question 8

Interosseus lipoma- loc, pain, margins/matrix, plan

Answer 8

loc- lower extremity (calcaneous mc)

pain- no

Imaging- lucent w/ calcification @ center

Plan- can leave alone (low risk)

Question 9

Hemangioma- loc, appearence, pan, management

Answer 9

loc- m/c tumor of spine

Pain- no

imaging- cordory cloth like appearence

Manage- can leave

Question 10

Giant cell tumor- age, pain, loc, border/matrix

Answer 10

Age- 20-40

Pain- localized pain w swelling (25% malignamt)

Loc- medullary cavity of epipysis ( mc of sacrum)

Imaging- well defined, lucent expanisle lesion, kinda soapy