PMC5623665_01
MRI of the cervical spinal cord (SC) of a 9-month-old Weimaraner with peracute onset of non-ambulatory tetraparesis. Sagittal T2W (A) and post-contrast T1W (B) sequences depict an intradural-extramedullary left sided ventrolateral compression of the SC at the level of C3-C4. The yellow arrow points at the round-shaped structure causing the SC compression. Green arrowheads point to the T2W and T1W inhomogeneous, mostly hypointense material present within the subarachnoidal space dorsal to the SC. Transversal T2W (C), pre-contrast T1W (D), GRE (E), and post-contrast T1W (F) sequences. A hyperintense signal of the core of the mass lesion compressing the SC can be evidenced in all sequences. A horizontal fluid-fluid level is noticed within the core of the round-shaped lesion in T2W sequences (A,C). The yellow line in the sagittal T2W and post-contrast T1W (A,B) indicates the level at which transversal sequences are depicted. Abbreviations: T2W, T2-weighted; T1W, T1-weighted; GRE, T2*, gradient echo.
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F1
The compression was caused by a round-shaped structure which showed a high intensity signal in T2W, GRE, SPAIR, and FLAIR sequences and an inhomogeneous iso- to slightly hyperintense signal in T1W sequences (Figure 1).
Follow-up MRI of the cervical spinal cord (SC) 8 weeks after initial presentation at the clinic. Intramedullary hyperintensities are present in the sagittal T2W sequence (A) dorsally to the vertebral body of C2 and at the level of C3-C4 (green arrowheads) in comparison to signal intensity of non-affected SC segments. Transversal T2W (B) and GRE (C) sequences depict intramedullary hyperintensities and concomitant presence of hypointense intramedullary lesions at the level of the left dorsal horn and left lateral white matter tracts (yellow arrows) as well as in the subarachnoid space (green arrows). The yellow line in the sagittal T2W sequence (A) indicates the level at which transversal sequences are depicted. Abbreviations: T2W, T2-weighted; GRE, T2*, gradient echo.
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F2
SC segments, compatible with chronic hemorrhage, most probably residually lying within the subarachnoid space. Same signal pattern was noted within the SC parenchyma, suggesting focal intramedullary bleedings in the chronic stage (Figure 2). Additionally, a focal ventral intramedullary hyperintensity was noticed at the level of C2 (Figure 2; green arrowheads).