MSK 2 Flashcards
aggressive bone lesions are typcially the result of
neoplasia or osteomyelitis
list a few examples of nonaggressive bone lesions
osteoma, cartilaginous exostoses, enthesophytosis
what are some ways to differentiate between nonaggressive and aggresive bone lesions?
- bone lysis
- periosteal reaction
- cortical integrity
- zone of transition
if there is bone lysis present, what does this tell you about the type of bone lesion?
bone lysis usually happens with aggressive processes and suggests there is more bone destruction and prouction, HOWEVER, lysis does not always associated with an aggressive lesions
characterize the following into aggressive or nonaggressive bone lesions:
- cortical destruction
- periosteal reaction
- zone of transition
aggressive: cortical destruction, periosteal reaction is not smooth, zone of transition is not distinct
nonaggressive: no cortical destruction, no periosteal reaction, zone of transition is sharp
what 3 things classify an aggressive bone lesion?
- cortical destruction
- periosteal reaction
- non distinct/long zone of transition
what 3 things classify a non aggressive bone lesion?
- no cortical destruction
- no periosteal reaction
- sharp zone of transition
what are the 3 types of bone lysis?
- geographic
- moth eaten
- permiative
what is the most aggressive type of lysis, and what is the least aggressive?
geographic<moth eaten<permiative
what does geographic bone lysis look like?
- margins are well defined with clear demarcation of the adjacent normal bone
what kind of bone lysis is this and why? is this an aggressive or non aggressive bone lesion?
geographic: can see the well defined margins and you can easily tell the lytic bone from the adjacent normal bone. this is a subchondral bone cyst
a non aggressive bone lesion
what is the pathology seen here?
a sunchondral bone cyst, can see a little circle of radiolucency in the subchondral bone on the medial chondyle
subchondral cysts are seen in horses of what age? what joint are they most common in? What is their classic location?
- seen in horses of any age
- usually the stifle but can be any joint
- seen most commonly in the weight bearing area of the medial femoral chondyle
what pathology is seen here?
a subchondral bone cyst. can see a round area of radiolucency on the medial chondyle
when would you see an INCREASE in the OPACITY of subchodnral bone?
with benign joint disease such as:
- degenerative joint disease
- sunchondral sclerosis seconday to chronic stress remodelling (like elbow dysplasia)
what type of bone lysis is seen here?
moth eaten lysis, can see multiple small geographic areas of lysis
what are some characteristic of permeative bone lysis?
- it is not well defined
- a long zone of transition to normal bone
what kind of bone lysis is this?
permeative. can see it is poorly defined and has a long zone of transition
a long zone of transition is associated with…
more aggressive bone diseases
what is a “periosteal reaction?”
- when the periosteum is proliferating and mineralizing in response to normal bone injury and healing
- the type of periosteal reaction you see happening can help you differentiate between aggressive vs non aggressive lesions