Definitely Benign Lesions

Question 1

Non ossifying fibroma

Answer 1

Less than 30 years

Mild expansion

Cortical and scalloping

Asymptomatic

If larger than 2cm- fcd

Later becomes sclerotic

No pathological frature

Question 2

Bone island

Answer 2

Grow along lines of stress

Question 3

Unicameral bone cyst in calcaneum

Answer 3

Anteroinferor aspect

Less stress so less pathological frature so no need to curretage and pack

Can be growing after 30 years also thus undergoing fatty involution thus getting the name intraosseus lipoma

Dd- pseudocyst of calcaneum because of less stress bone trabeculae are atrophic

Question 4

Pitts pit

Answer 4

Lytic lesion with sclerotic borders in lateral aspect of the femoral neck

More pronounced in femoroacetabular impingement

Synovial herniation pit

Question 5

Bone infarct

Answer 5

Pain in sle and sickle cell

Classical: serpiginous sclerotic border

Early stages : mixed lytic sclerotic in diametaphyseal