Fibrous Xanthoma

Question 1

Fibrous Xanthoma description

Answer 1

2 types: FCD (8-20) >NOF (2-8)Within cortex; can’t really distinguish, just by location; VERY COMMON

Question 2

Fibrous Xanthoma pain

Answer 2

Most painless, asymptomatic; path fx rare

Question 3

Fibrous Xanthoma location

Answer 3

Nonossifying fibroma >2cm (into medullary cavity); Fibrous cortical defect <2cm (in cortex)

Question 4

Fibrous Xanthoma plain film

Answer 4

Eccentric, small, sclerotic margin, lytic, soap bubble, sharp zone, 90% tib/fib, diametaphyseal

Question 5

Fibrous Xanthoma ddx

Answer 5

FCD ddx multiple lesions w/ neurofibromatosis. NOF ddx if solitary lesion

Question 6

Fibrous Xanthoma malignant/refer?

Answer 6

NO – most regress w/o tx – unless path fx; mild uptake on bone scan