Lecture 6: Principles of musculoskeletal image interpretation: aggressive vs nonaggressive bone lesions Flashcards
Which image is aggressive vs non-aggressive and why
Left- aggressive- lysis, periosteal reactions, polyostotic
Right: non-aggressive- proliferation but not lytic
what are some causes of aggressive bone lesions
- Primary bone neoplasia
- Primary soft tissue neoplasia
- Metastatic bone neoplasia
- Bacterial osteomyelitis
- Fungal osteomyelitis
what are some signs of aggressive bone lesions
- Bone lysis
- Periosteal reaction
- Rate of progression
- Zone of transition
- Cortical lysis
is this an aggressive or non-aggressive lesion. Identify 1-2
aggressive
1. Bone lysis
2. Periosteal reaction
what is degree of bone lysis called
progression
What wrong- aggressive or nonaggressive
bone lysis- aggressive
what are the two types of periosteal reactions
continuous and interrupted
what can cause a continuous periosteal reaction
callus, slow growing neoplasia
what can cause an interrupted periosteal reaction
neoplasia, osteomyelitis
which is more aggressive: continuous or interrupted periosteal reactions
interrupted because likely neoplasia or osteomyelitis
what type of periosteal reaction is this
continuous periosteal reaction
what type of periosteal reaction is this
Interrupted
the faster the progression = more ___
aggressive
a regular, distinct margin zone of transition means the lesion is aggressive or non-aggressive
non-aggressive
an irregular, indistinct margin zone of transition means the lesion is non-aggressive or aggressive
aggressive
Is cortical lysis aggressive or non-aggressive
aggressive
is cortical thinning aggressive or non-aggressive
non-aggressive
what indicated by 1 and is it aggressive or non-aggressive
cortical lysis- aggressive
generalized bone lesions are more likely due to __ or __
metabolic or nutritional
focal bone lesions are more likely __
primary bone tumors
multifocal bone lesions are likely due to __spread and could be __ or __
hematogenous, neoplasia bacterial osteomyelitis
how would you classify the location of this lesion: generalized, focal, multifocal
generalized- affecting ulna, radius and metacarpal bones
how would you classify the location of this lesion: generalized, focal or multifocal
focal
how would you classify the location of this lesion: generalized focal or multifocal
multifocal
a bone lesion at the epiphysis is likely due to __ or __
infection, nutritional
bone lesions in the metaphysis are typically ___ or __
primary neoplasia, infection
based on the location of this lesion what are you concerned about
Primary bone tumor
bone lesion in the diaphysis can be caused by what 3 things
- Metastatic neoplasia- centered at nutrient form and
- Secondary neoplasia- soft tissue mass with bone invasion
- Focal infections- related to trauma
based on the location of this bone lesion what are you concerned about
- Metastatic neoplasia
- Secondary neoplasia
- Focal infections
primary bone neoplasias are primarily in who
geriatric, large breed dogs
soft tissue neoplasia typically has __centered around soft tissue. Usually more __ and crosses ___
swelling, lytic, joints
what wrong here and what you concerned about
Lysis on patella, femur, patella displaced, soft tissue swelling
Concern for soft tissue neoplasia
metastatic neoplasia usually centered around ___in bone
nutrient foramen
what tumor types typically cause metastatic spread to bone
carcinoma, sarcoma
what type of disease are you concerned about
metastatic disease
is Bacterial osteomyelitis typically focal or multifocal
focal
how does bacterial osteomyelitis occur
trauma or hematogenous spread
is fungal osteomyelitis focal or multifocal
multifocal
what signalment typically gets fungal osteomyelitis
male, young, hunting dog
what is more likely here: bacterial or fungal osteomyelitis
bacterial-focal
what is more likely here- fungal or bacterial osteomyelitis
fungal-multifocal
what wrong and what cause
fracture of humerus due to primary bone tumor
