B bone tumor 3 Flashcards
Simple Bone Cyst
true cyst of bone- fluid filled caity lined with endothelia and fibruous tissue
younger age associated with more aggressive lesion
◦Asymptomatic unless pathological fracture
not common in the knee
possible spntaneous resolution
Unicameral Bone Cyst
Geographic lesion
Mildly expansile
- No wider than physis
Sharp zone of transition
Sclerotic margin
“Empty” appearing matrix
Unicameral Bone Cyst
Metaphyseal location
“Active” lesions maintain position adjacent to physeal plate
Latent” lesions “drift away” from physeal plate to metadiaphysis
Internal scalloping of cortex may create false “septations”
treatment- curretage and pack
Unicameral Bone Cyst
◦“Fallen fragment” sign may be seen if fx’d
Unicameral Bone Cyst
Lesions typically asymptomatic, transient and self-resolving
Sites: long bones
Location- Metaphyseal/metadiaphyseal
◦ - Juxtacortical location
Shape/Size
- Ovoid, oriented along long axis of bone
- Most in the 0.5 – 3 cm. Range
Sclerotic, scalloped margin; well-defined
Benign Fibrous Cortical Defect
Juxtacortical location
Long axis of lesion aligns with long axis of bone
Sclerotic margins, often smoothly scalloped
Benign Fibrous Cortical Defect
fibroxanthoma two similar lesions
benign fibrous cortical defect
Non-ossifying Fibroma of Bone
Non-ossifying Fibroma of Bone similar to:
Benign fibrous cortical defect
larger
more likely to persist
more involvement of central portion of bone
weaken bones
3 presentations of Fibrous Dysplasia
◦Monostotic: most common (75% cases)- ?more?
◦Polyostotic: approx. 25%
◦Polyostotic with assoc. endocrine anomaly (rare)
Many cases are asymptomatic and incidentally noted on x-ray exam
idiopathic
◦Lytic, geographic with sclerotic border
◦Sclerotic
◦Mixed, “disorganized” appearance of matrix
Bone expansion common with intact cortex
◦Thinned maybe, but not destroyed
◦May path fracture
No periosteal rx’n or soft tissue mass
Fibrous Dysplasia
Fibrous Dysplasia
Fibrous Dysplasia
not common in the ribs
Fibrous Dysplasia
Fibrous Dysplasia
Fibrous Dysplasia
Polyostotic Fibrous Dysplasia
when in the hand it mimics olliers disease
Polyostotic Fibrous Dysplasia
Polyostotic Fibrous Dysplasia
Histologically a type of A-V malformation, not a true cyst.
May develop as a primary lesion, or secondary to a pre-existing lesion
◦Some authors feel almost all are secondary
Age- adolescent to young adult most common
◦80% occur below age 20
Typically mild pain with hx over mos.-yrs.
Aneurysmal Bone Cyst
Sites – 80% long bone metaphyses or post. arch
◦One of three most benign posterior arch lesions of spine
Location in long bones- typically metaphyseal and eccentrically placed
Expansile (often marked), geographic lesion
Cortex may be thinned to imperceptible- can mimic “blowout” type metastatic lesion
Treated with curretage/packing- may reoccur
Aneurysmal Bone Cyst
Aneurysmal Bone Cyst
Aneurysmal Bone Cyst
