Today’s case is an 8-year-old male neutered Beagle mix with progressive paraparesis progressing to inability to walk over 4 months. Can you find the lesion?
On referral radiographs of the spine, there is marked widening of one side of the intervertebral foramen at L1-L2. This is best seen on the lateral projections. The margins of the foramen are smooth and sclerotic with no evidence of lysis.
The widening of the intervertebral foramen is characteristic of a slowly progressive peripheral nerve sheath tumor.