Solitary Lytic Lesions - Hallmark Findings (FOG MACHINES)

Question 1

Circumscribed lesion, ground glass/soap bubble appearance.

Answer 1

Fibrous dysplasia

Question 2

Fibrous dysplasia occurs MC where?

Answer 2

Ribs, femur

Question 3

Eccentric lesion in the metaphysics or diaphysis of long bone.

Answer 3

Osteoblastoma

Question 4

Lesion crossing the epiphyseal plate, soap bubble appearance

Answer 4

Giant Cell Tumor

Question 5

Most likely from colon, lung and breast.

Answer 5

Metastasis

Question 6

Soap bubble appearance MC in long bones (distal femur).

Answer 6

Aneurysmal bone cyst

Question 7

Oval subarticular (epiphyseal) lytic lesion <5cm

Answer 7

Chondroblastoma

Question 8

Corduroy cloth appearance (vertical black lines).

Answer 8

Hemangioma

Question 9

Brodie’s abscess.

Answer 9

Infection

Question 10

Eccentric defect with thin rim of sclerosis >3 cm

Answer 10

Non-ossifying fibroma

Question 11

Geographic lesion in the medullary region

Answer 11

Eosinophilic granuloma

Question 12

Unicameral cyst-single soap bubble in long bones (proximal numerous).

Answer 12

Simple bone cysts