VRU 2012 Flashcards
What is the most common findings with thoracic histiocytic sarcoma?
1: Lymphadenopathy - Sternal and TB LN not mediastinal
What is the most common lung lobe affected by histiocytic sarcoma?
Right middle - ventral aspect
Bernese moutain dogs are how many more times likely to develop histiocytic sarcoma? Rotties?
BMD: 225x
Rotties: 26x
Majority of histiocytic sarcoma pulmonary masses are described as?
Poorly maginated
Bronchocenteric
Heterogeneous in contrast enhancement.
What is the most common hepatic mass?
Hepatocellular carcinoma
Common enhancement pattern for hepatocellular carcinoma with contrast enhancing CT?
- Marginal enhancement
- Centrally enhancement
What is the sensitivity and specificity of radiographs when looking at elbows for incongruity?
88% sensitivity
92% specific
What was the most common finding of joint incongruity found on radiographs?
Radioulnar step
Widening of humeroulnar and humeroradial joint space
What sequence will produce the least amount of susceptibility artifact when looking at stifles with implants?
TSE and sequences employing spectral fat saturation
What is the difference between diamagnetic and paramagnetic or ferromagnetic materials?
Diamagnetic has paired electrons
Para and ferro are unpaired electrons thus can create more of a magnetic field and cause distortion of the B0
What is the difference between paramagnetic and ferromagnetic?
Paramagnetic will loose its magnetism after it is taken out of a magnet
Ferro does not lose its magnetism.
What two parts make up a susceptibility artifact?
Signal void
Misregistration specifically in the frequency and slice-encoding gradients
What sequence is most affected by susceptibility artifact?
GRE due to the lack of 180 degree refocusing pulse.
What impant material had the least amount of susceptibility artifact?
Titanium alloy and stainless steal crimps
Stainless steel TPLO had the worse
What sequence weighting is least susceptible to metal in MRI?
T1 due to short TE.
What was the most common feature of articular process joint degeneration on MRI in great dane dogs affect with cervical spondylomyelopathy?
Reduction or loss or irregular pattern of the synovial fluid in the articular joints - this was associated with lateral compression
Are degenerative changes in the articular process joints common in Great danes on MRI?
Yes — 86% of articular joints are degenerative
Most common degenerative changes see on MRI n the articular process joints of Great danes was seen where in the cervical spine?
Caudal spine
How was intraoberver and interobserver variability in grading incongruity on radiographs?
Not great
Mankin et al: HASTE imaging was in agreement with T2W sequences more often when there was a lesion or when there is not a lesion?
96% agreement when there is not a lesion - 98% agreement when there is not a surgical lesion 58% when there is a lesion - 82% lesion is considered surgical
Palus et al: With intracranial lymphoma lesions all dogs had involvement of what portion of the brain while all cats had involvement of what portion?
Dogs - Rostrotentorial Cats - Caudotentorial
Palus et al: With CNS lymphoma all lesions where what intensity on T2 and T1 when compared to the white matter?
T2 hyperintense T1 hypointense
Palus et al: All CNS lymphoma lesions exhibit what characteristic?
Mass effect Contrast enhancement
Palus et al: CNS lymphoma is the most common tumor affecting the spinal cord and second most common intracranial tumor in what species?
Cat
Palus et al: There was what type of male to female ratio for CNS lymphoma?
1.7:1
Palus et al: The majority of lesions had normal or abnormal meninges surrounding it?
abnormal with half of the meninges contrast enhancing.
Le Roux et al: Why is the tracheal bifuraction angle worth little value when evaluating left atrial enlargement in dogs?
Large degree of overlap Poor sensitivity (15-40%)
Le Roux et al: What is the normal tracheal bifuraction angle on DV images in a dog?
60-90 degrees
Anjou et al: Does using fat suppression techniques increase the likelhood of obtaining a diagnosis of meningeal enhancement on MRI?
Yes..significantly— in all Times of acquisition.
Time delay did NOT improve meningeal enhancement.
Anjou et al: What type of fat suppression technique was used in this paper where fat suppression was looked at to see if it helps detect meningeal enhancement?
Chemical shift fat suppression - not STIR because that would STIR out enhancement.
Anjou et al: What disease process did difffuse and leptomeningeal enhancement occur more often?
inflammatory
Neoplasia was always thicker though
What meningeal enhancement is considered always pathologic?
Leptomeningeal
Pachymeningeal enhancement is considered pathologic in humans when what is seen?
Mutiple contiguous slices thickness of >2mm
Nodular pattern
Two different ways to characterize the distribution of meningeal enhancement?
Focal vs Regional.
Two different ways to characterize the distribution of meningeal enhancement?
Focal vs Regional.
Is meningeal enhancement seen in brain infarct?
Yes
What sequence has a longer TI…FLAIR or STIR?
FLAIR. Fat relaxes faster and therefore the nulling of the signal of fat is faster.
What are the most common LN to be enlarged with thoracic histiocytic sarcoma in dogs?
Sternal and TB
What is the occipital bone index in Schmidt et al study on syringomyelia?
It is the Volume (LxWxH) of the occipital bone compared to the entire skull volume.
In Schmidt et al study was there a significant difference in the occipital bone index between Cavies with syringomyelia, cavies without syringomyelia and Frenchies without caudal occipital malformation?
None.
Schmidt et al: Conclude what about caudal occipatal malformation and syringohydromyelia?
Occipital hypopaplasia is likely not a cause for syringomyelia
Piola et al: Suggest what changes are seen in incomplete humeral condyle ossification in a dog on MRI?
Heterogeneous (central area of hyperintensity) humeral condyle on STIR. - most common feature
This was seen in the contralateral limbs of dogs with incomplete ossification in the other limb. This was not see in normal dogs (dogs with both elbows normal).
So this might represent future fissure in the making.
Piola et al: what was the percentage of dogs with bilateral disease when looking at incomplete humeral condyle ossification on MRI?
60%
Piola et al: what percentage of fissures did radiographs miss that MRI picked up for IHCO?
32%
Piola et al: what breed and sex were more predisposed to IHCO?
Male Spaniels
Holowinski et al: MRI of navicular bursa adhesions, what type gave 100% positive predictive value? What are the characteristics of this?
Type 3 which is where the fluid signal is disrupted and a well-defined tissue is present
Holowinski et al: MRI of navicular bursa adhesions, where were the other most common lesions?
DDFT Navicular bone
Holowinski et al: MRI of navicular bursa adhesions, what was the best images to evaluate for bursa adhensions? what was the worse?
transverse - best dorsal - worst
Holowinski et al: MRI of navicular bursa adhesions, what were the best sequences to evaluate for adhesions?
PD or STIR
Holowinski et al: MRI of navicular bursa adhesions,what did they say about their slice thickness at 3.5mm?
It was adequate
Jone et al: TB lymphadenopathy and diagnosis, what was the most common diagnosis?
Neoplasia with lymphoma
Jone et al: TB lymphadenopathy and diagnosis, what was the most common non-lymphoid neoplasia?
Carcinomas and histiocytic sarcoma
Holowinski et at: Holowinski et al: MRI of navicular bursa adhesions, Where do adhesions common occur?
- DDFT
- Collateral seasomoidean ligaments
- Navicular bone
- Distal sesamoidean impar ligament.
Having what enlarged increases you suspicion of an adhesion with the DDFT?
One side of the collateral sesamoidean ligament as seen in the picture CSL
Amort et al: MRI of LS disc degeneration in normal GSD, Disc degeneration of GSD was higher or lower (grades) than other dogs?
Higher…. GSD are predisposed to LS disc degeneration. This is independent from other disc spaces
Amort et al: MRI of LS disc degeneration in normal GSD, what was the difference between the alignment of the LS spine in GSD vs non-GSD dogs?
GSD had a mean malalignment of 2.85mm which is 1.8 times higher than other species.
LS protrusion greater than 2mm is considered clinically relevant.
Gutierrez et al: MRI features of cervical articular process degeneration in Great danes with wobblers, Where were the most severe changes?
Between C4-C5 and C7-T1
Gutierrez et al: MRI features of cervical articular process degeneration in Great danes with wobblers, What was the most frequent associated MRI feature with articular process degeneration?
Reduction or loss of hyperintense synovial fluid signal
Gutierrez et al: MRI features of cervical articular process degeneration in Great danes with wobblers, degenerative changes in the articular processes were correlated with what type of compression?
Lateral compression.
Samoy et al: Sensit and spec of rads for elbow incongruity, what is the sensitivity and specificity of radiographs for detecting incongruity?
sensitivity = 89%
Specificity = 92%
Making it a good screening tool for elbow encongruity.
Samoy et al: Sensit and spec of rads for elbow incongruity, what are the four signs of elbow incongruity?
Radioulnar step
enlarged humerounlar joint space
elliptic shape of the trochlear notch
cranial displacement of the humeral head
Samoy et al: Sensit and spec of rads for elbow incongruity, what is the advised oblique to look for elbow incongruity?
Cranial 15 degree medial - caudolateral
Samoy et al: Sensit and spec of rads for elbow incongruity, what was the most frequent sign for elbow incongruity?
Radioulnar step
Widening of the humeroulnar and humeroradial joint space
Fat dogs and old dogs had decrease in their ability to do what with the lumbosacral joint?
Extend it and greater severity of spondylosis.
Reetz et al: CT features of pleural masses: What lymph nodes drain the mediastinum?
Cranial mesenteric
Sternal
Reetz et al: CT features of pleural masses: What are your two ddx for pleural thickening with contrast enhancement?
Inflammation/infectious (fungal, bacterial, FB)
Neoplastic (Mets, methositheoma)
Fischetti et al: CT and MRI of cats with acromegaly: What is the excess hormone related to Feline acromegaly?
Growth hormone
Insulin-like growth factor 1
Fischetti et al: CT and MRI of cats with acromegaly: What are the main soft tissue abnormalities of acromegaly in cats?
Frontal bone thickened
Soft tissue accumulation of the nasal cavity, sinus and pharynx (respiratory issues)
Pituitary tumor - 5/6 cats