PMC9051508_01
Thoracolumbar MRI in a 4-month-old 4.0 kg sexually intact male dachshund with an acute onset of diffuse paraspinal pain and T3-L3 myelopathy (case one). (A):T2W sagittal image of the thoracolumbar spine showing heterogenous extradural T2 hyperintensity located between T3-T8 (arrow). (B):T2W transverse image at the level of T8 with T2 heterogenously hyperintense extradural material in the left dorsolateral vertebral canal (arrow). (C):T1W pre-contrast image at the level of T8 with T1 iso- to hyperintense extradural material in the left dorsolateral vertebral canal (arrow). (D):T1W post-contrast image at the level of T8 with mild homogenous contrast enhancement of the extradural material in the left dorsolateral vertebral canal (arrow). (E):T2* image at the level of T8 with hyperintense extradural material in the left dorsolateral vertebral canal and small T2* signal void, consistent with a susceptibility artifact medial to the hyperintense material (arrow).
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F1
MRI also revealed multifocal T2W hypointense in situ intervertebral discs (Figure 1).
PMC9051508_02
Cervical MRI in an 11-month-old 8.3 kg sexually intact male dachshund with an acute onset of cervical pain (case two). (A):T2W sagittal image of the cervical spine that is unremarkable. (B):T1W sagittal image of the cervical spine that is unremarkable. (C):T1W post-contrast sagittal image of the cervical spine with dorsal and ventral meningeal contrast enhancement from C1-C4 (arrow). (D):T2W transverse image at the level of C1 that is unremarkable. (E):T1W transverse image at the level of C1 that is unremarkable. (F):T1W post-contrast image at the level of C1 showing circumferential meningeal contrast enhancement.
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F2
Differentials following MRI included meningitis and neoplasia, in particular round cell neoplasia (Figure 2).
Repeat Cervical MRI of case two following cerebellomedullary cisternal CSF tap. (A):T2W sagittal image of the cervical spine with T2 hyperintensity along the dorsal cervical musculature fascial planes (arrow) with increased T2 hyperintensity dorsal to the spinal cord at C1-C2 compared to Figure 2. (B):T1W sagittal image of the cervical spine with T1 hyperintensity along the dorsal musculature fascial planes (arrow). (C):T2W transverse image at the level of C1 with T2 iso to hyperintense material resulting in spinal cord compression (arrow). (D):T1W transverse image at the level of C1 with T1 iso- to hypointense material resulting in spinal cord compression.
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F3
T2W hyperintensity between fascial planes of the cervical dorsal spinal musculature. There was also extradural material at the level of C1 that was T1W hyperintense and T2W iso- to hyperintense. This was interpreted as hyperacute hemorrhage (Figure 3).
PMC9051508_03
Cervical MRI in a 5-month-old 2.5 kg sexually intact male Yorkshire Terrier with an acute onset of cervical pain (case three). (A):T2W sagittal image of the cervical spine with longitudinal T2 hyperintensity extending from C2-C6 (arrow). (B):T2W transverse image at the level of C4 showing T2 hyperintense extradural material resulting in severe spinal cord compression (arrow). (C):T1W pre-contrast transverse image at the level of C4 showing T1 iso- to hypointense extradural material resulting in severe spinal cord compression (arrow). (D):T1W post-contrast image at the level of C4 showing minimal contrast enhancement along the rim of the extradural material (arrow). (E):T2* image at the level of C4 with heterogenously hyperintense extradural material in the left dorsolateral vertebral canal. A susceptibility artifact is present (arrow).
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F4
T2W hyperintense and T1W iso- to hypointense material with minimal rim contrast enhancement that extended from C2-C6 (Figure 4). T2* imaging revealed the presence of mixed hyperintensity and signal void consistent with a susceptibility artifact at the level of C2, C4 and C5.