1. Neurology Topic-Cerebellar Degeneration
Figure 1. Sagittal and transverse T2-Weighted Images demonstrate prominent cerebellar sulci and paucity of folia diffusely involving the cerebellar hemispheres. The cerebellum appears smaller than normal.
Topic-Feline Ischemic Encephalopathy
Figure 1. Image 1: Dorsal T1 weighted MRI after
administration of contrast. The MRI reveals a parasitic track lesion (labeled #1) extending from the right olfactory bulb to the frontal lobe. There is also
enhancement along the entire parenchymal lesion into the temporal lobe, which is the pathway of the parasite through the parenchyma. The parasite exited the parenchyma over the right temporal lobe. The parasite was found in the area of the meninges
on the right temporal lobe that appears enlarged after administration of contrast on the T1 weighted MR (labeled #2). Note the enhancement of the meninges over the right temporal lobe which represents the region of the infarction to the MCA.
Figure 2. Ventral aspect of the brain of a cat with FIE. Note the location of the Cuterebra larva exiting the brain at the level of the right MCA and the rows of black spines on the larva. An mri of this cat’s brain revealed a parasitic track lesion extending from the right cribriform plate, through the olfactory bulb, frontal lobe and into the temporal lobe before exiting the parenchyma just rostral to the right piriform lobe and the origin of the right MCA.
Topic-Head Tilt
Figure 1. Left head tilt in a cat.
Figure 2. MRI of same cat with left head tilt seen in
previous figure.
Figure 3. Paradoxical vestibular syndrome in a dog.
Figure 4. Choroid plexus papilloma at postmortem.

2. Neurology Topic-Hydrocephalus
Figure 1. Hydrocephalus: T1-weighted transverse image of the head of a dog with severe hydrocephalus. The level of the image is approximately mid-cerebrum. Fluid dilation is seen in the lateral and third ventricles. A very thin remnant of cerebral cortex can be seen lying just under the cranium (Mary O. Smith).
Figure 2. Hydrocephalus: T1-weighted saggital image of the same dog as in image 1. Fluid dilation is seen in the lateral third and fourth ventricles (Mary O. Smith).
Topic-Meningioma
Figure 1. A 2.0 x 2.0 x 1.5cm left extra-axial parietal
lobe mass. The mass is heterogeneously hyperintense on T2-WI and non-uniformly isointense on T1-WI, and homogeneously contrast enhances with evidence of a dural tail sign. The left cerebral hemisphere is swollen and there is peritumoral hyperintensity on T2-WI. There is evidence of transtentorial herniation and deviation of the midline to the right. The calvaria adjacent to the tumor is thickened and hypointense. The right frontal sinus has infiltrate that is hyperintense on T2-WI and
isointense on T1-WI, and heterogeneously contrast
enhances.
Topic-Otitis Media and Interna
Figure 1. Bilateral bulla infiltrate that is hyperintense on T2-weighted images, isointense on T1-weighted images (T1-WI) and contrast enhances. The lesion extends from the left middle ear through the petrous temporal bone to the left ventrolateral brainstem. There is a wedged shape homogenously contrast enhancing left brainstem lesion on transverse T1-WI.
Topic-Schiff-Sherrington Phenomenon
Figure 1. Schiff-Sherrington phenomenon in a Labrador retriever with a thoracolumbar spinal fracture. The dog was ambulatory with intact proprioception in the forelimbs, but in lateral recumbency had forelimb extension, which was resistant to manual attempts to flex the limbs (Mary Smith).
Topic-Spinal Dysraphism
Figure 1. The cerebellum is concave along its caudal
vermal surface and the medulla is overcrowded in the
caudal fossa and kinked on the sagittal T2WI. There is attenuation of the CSF pathway at the occipital foramen. There is a small accumulation of fluid in the region of the quadrigeminal cistern. There is moderate lateral ventriculomegaly. There is a moderately sized cavitary hyperintense intramedullary lesion located at the level of C1 to C6 on the sagittal T2WI.

3. Neurology Topic-Steroid-Responsive Meningitis- Arteritis – Dogs
Figure 1. CSF cytology (cytospin preparation) from a
beagle dog suffering from the acute form of steroidresponsive meningitis-arteritis. Note the neutrophilic pleocytosis.
Figure 2. CSF cytology (cytospin preparation) from a
beagle dog suffering from the protracted form of steroidresponsive meningitis-arteritis. Note the predominantly mononuclear pleocytosis. The numerous erythrocytes are indicative of blood contamination, which is frequently likely due to vessel damage.
Figure 3. Cerebrospinal fluid from a beagle dog with
steroid-responsive meningitis-arteritis. Note the turbid CSF sample. Nucleated cell count: >2,000 cells/mcl.
Topic-Vestibular Disease, Geriatric – Dogs
Figure 1. Typical head tilt in canine vestibular disease.
Topic-Vestibular Disease, Idiopathic – Cats
Figure 1. Typical head tilt in feline idiopathic vestibular disease.

4. Neurology Topic- Cerebellar Degeneration
Figure 1. Sagittal and transverse T2-Weighted Images demonstrate
prominent cerebellar sulci and paucity of folia diffusely involving the
cerebellar hemispheres. The cerebellum appears smaller than normal.

5. Neurology Topic- Feline Ischemic Encephalopathy
Figure 1. Image 1: Dorsal T1 weighted MRI after administration of contrast. The MRI reveals a parasitic track lesion (labeled #1) extending from the right olfactory bulb to the frontal lobe. There is also enhancement along the entire parenchymal lesion into the temporal lobe, which is the pathway of the parasite through the parenchyma. The parasite exited the parenchyma over the right temporal lobe. The parasite was found in the area of the meninges on the right temporal lobe that appears enlarged after administration of contrast on the T1 weighted MR (labeled #2). Note the enhancement of the meninges over the right temporal lobe which represents the region of the infarction to the MCA.

6. Neurology Topic- Feline Ischemic Encephalopathy
Figure 2. Ventral aspect of the brain of a cat with FIE. Note the location
of the Cuterebra larva exiting the brain at the level of the right MCA and
the rows of black spines on the larva. An mri of this cat’s brain revealed a
parasitic track lesion extending from the right cribriform plate, through the
olfactory bulb, frontal lobe and into the temporal lobe before exiting the
parenchyma just rostral to the right piriform lobe and the origin of the right
MCA.

7. Neurology
Topic- Head Tilt
Figure 1. Left head tilt in a cat.

8. Neurology Topic- Head Tilt
Figure 2. MRI of same cat with left head tilt seen in previous figure.

9. Neurology Topic-Head Tilt
Figure 3. Paradoxical vestibular syndrome in a dog.

10. Neurology Topic-Head Tilt
Figure 4. Choroid plexus papilloma at postmortem.

11. Neurology Topic-Hydrocephalus
Figure 1. Hydrocephalus: T1-weighted transverse image of the head of a
dog with severe hydrocephalus. The level of the image is approximately
mid-cerebrum. Fluid dilation is seen in the lateral and third
ventricles. A very thin remnant of cerebral cortex can be seen lying just
under the cranium (Mary O. Smith).

12. Neurology Topic-Hydrocephalus
Figure 2. Hydrocephalus: T1-weighted saggital image of the same dog as
in image 1. Fluid dilation is seen in the lateral, third, and fourth
ventricles (Mary O. Smith).

13. Neurology Topic-Meningioma
Figure 1. A 2.0 x 2.0 x 1.5cm left extra-axial parietal lobe mass. The mass
is heterogeneously hyperintense on T2-WI and non-uniformly isointense
on T1-WI, and homogeneously contrast enhances with evidence of a dural
tail sign. The left cerebral hemisphere is swollen and there is peritumoral
hyperintensity on T2-WI. There is evidence of transtentorial herniation and
deviation of the midline to the right. The calvaria adjacent to the tumor
is thickened and hypointense. The right frontal sinus has infiltrate that is
hyperintense on T2-WI and isointense on T1-WI, and heterogeneously
contrast enhances.

14. Neurology Topic-Otitis Media and Interna
Figure 1. Bilateral bulla infiltrate that is hyperintense on T2-weighted
images, isointense on T1-weighted images (T1-WI) and contrast enhances.
The lesion extends from the left middle ear through the petrous temporal
bone to the left ventrolateral brainstem. There is a wedged shape
homogenously contrast enhancing left brainstem lesion on transverse T1- WI.

15. Neurology Topic- Schiff-Sherrington Phenomenon
Figure 1. Schiff-Sherrington phenomenon in a Labrador retriever with
a thoracolumbar spinal fracture. The dog was ambulatory with intact
proprioception in the forelimbs, but in lateral recumbency had forelimb
extension, which was resistant to manual attempts to flex the limbs (Mary
Smith).

16. Neurology Topic-Spinal Dysraphism
Figure 1. The cerebellum is concave along its caudal vermal surface and
the medulla is overcrowded in the caudal fossa and kinked on the sagittal
T2WI. There is attenuation of the CSF pathway at the occipital foramen.
There is a small accumulation of fluid in the region of the quadrigeminal
cistern. There is moderate lateral ventriculomegaly. There is a moderately
sized cavitary hyperintense intramedullary lesion located at the level of C1
to C6 on the sagittal T2WI.

17. Neurology Topic- Steroid-Responsive Meningitis-Arteritis - Dogs
Figure 1. CSF cytology (cytospin preparation) from a beagle dog suffering
from the acute form of steroid-responsive meningitis-arteritis. Note the
neutrophilic pleocytosis.

18. Neurology Topic- Steroid-Responsive Meningitis-Arteritis - Dogs
Figure 2. CSF cytology (cytospin preparation) from a beagle dog suffering
from the protracted form of steroid-responsive meningitis-arteritis. Note the
predominantly mononuclear pleocytosis. The numerous erythrocytes are
indicative of blood contamination, which is frequently likely due to vessel
damage.

19. Neurology Topic-Steroid-Responsive Meningitis-Arteritis - Dogs
Figure 3. Cerebrospinal fluid from a beagle dog with steroid-responsive
meningitis-arteritis. Note the turbid CSF sample. Nucleated cell count:
>2,000 cells/mcl.

20. Neurology Topic-Vestibular Disease, Geriatric - Dogs
Figure 1. Typical head tilt in canine vestibular disease.

21. Neurology Topic-Vestibular Disease, Idiopathic - Cats
Figure 1. Typical head tilt in feline idiopathic vestibular disease.