Rad III MT1 - Chondroblastoma, Non-ossifying fibroma (NOF), Fibrous Cortical Defect, Simple Bone Cyst, ABC

aka for chondroblastoma

Codman's tumor

age for chondroblastoma

10-25

what is chief complaint for chondroblastoma

pain referred to adjacent jt

what is the classic location for chondroblastoma

epiphysis and apophysis

will chondroblastoma extend into metaphysis

yes

T/F periosteal bone apposition occurs in adjacent metaphysis in 1/3 of pts

True

50% of chondroblastoma lesions demonstrate what

fluffy cotton wool calcification of the matrix

radiographic features of chondroblastoma

eccentrically placed with sharp zone of transition, oval/round lytic esion of epiphysis of long bone

over arching term for NOF and fibrous cortical defect

fibrous xanthoma

what is fibrous xanthoma

faulty ossification and not a true neoplasm

age range for NOF

8-20

age range for fibrous cortical defect

4-8

which is more common, NOF or FCD

FCD

S/S of fibrous xanthoma

most lesion are asymptomatic and incidental findings

what percent of normal children have FCD

30-40%

gender more common for NOF/FCD

male

what size lesion is symptomatic and leads to pathologic fx in children

NOF - over 8cm

MC location for NOF

distal tibia followed by distal femur, proximal tibia, humerus and fib

MC location for FCD

posterior medial surface of distal femur

size for FCD lesion

less than 2 cm

which fibrous xanthoma is usually over 2 cm?

NOF

radiographic description of NOF

solitary, eccentric, radiolucent ovoid, bubbly, located in metaphysis with cortical expansion and thinning, medullary portion has dense sclerotic border

radiographic appearance of FCD

lesion is small (2-3 cm) with lucent defect within the cortex, may be sclerotic as it heals

when might periosteal response occur with FCD lesion

only as secondary to pathologic fracture

when might NOF be bilateral and symmetric

when associated with neurofibromatosis

NOF/FCD hot on bone scan?

mild uptake possible

can FCD/NOF turn into bone islands?

yes

akas for simple bone cyst?

unicameral bone cyst

solitary bone cyst

juvenile bone cyst

is a bone cyst a true neoplasm

no

simple bone cysts make up what percent of primary bone tumors

3%

what age range is most common for simple bone cyst

3-14