VRU 2017 Flashcards
When taking hoof radiographs in a horse for balance assessment, what is true?
A) Relationship
In a small case study of spinal mast cell tumor in dogs, all CT & MRI lesions were located ___________.
Extradural (epidural, paravertebral, rarely polyostotic)
Which of the following statements is true regarding spinal mast cell tumor in dogs?
A) Lesions most commonly are intradural or intramedullary
B) Most common presentation is polyostotic medullary lesions without periosteal proliferation
C) Imaging appearance is variable and can overlap with other round cell tumors & sarcomas affecting the vertebral column
D) Lesions are best visualized on T2W series.
Answer = C
A is false because the lesions are EXTRADURAL.
B is false because the majority of the lesions were epidural masses or paravertebral invading lesions. Only 1 case of polyostotic lesions.
D is false because lesions are best seen on STIR or fat-suppressed images primarily hyperintense and can be difficult to see with medullary and epidural fat
What is the average HU of the sentinel clot sign? Of hemoabdomen?
Sentinel clot sign = 56HU (range 43-70)
Hemoabdomen = 34HU (range (20-45)
What 2 characteristics on CT can distinguish a liposarcoma from a lipoma?
A) Presence of contrast enhancement and lack of a defined capsule
B) Areas of fat attenuation and heterogeneous internal attenuation
C) Presence of contrast enhancement and attenuation higher than fat
D) Lack of a defined capsule and heterogeneous internal attenuation
Answer = C
Liposarcomas have presence of contrast enhancement (100%) and attenuation higher than fat
Lipomas are homogeneously fat-attenuating with NO enhancement
Which of the following is NOT found as a characteristic of a liposarcoma on CT?
A) ~2/3 have a well-defined capsule
B) Post contrast enhancement
C) ~75% have at least 1 focus of central fat attenuation
D) Homogeneous internal attenuation
Answer = D
Liposarcoma characteristics:
77% had areas of fat attenuation
100% enhanced
81% heterogeneous internal attenuation
38% lacked a defined capsule (suggestive of local infiltration)
