Neuroaxonal dystrophy in a Jack Russell terrier pup resembling human infantile neuroaxonal dystrophy

A 9-week-old Jack Russell terrier with progressive ataxia had histopathological lesions consistent with neuroaxonal dystrophy. Gross observation revealed absence of the septum pellucidum, hypoplasia of the corpus callosum and marked bilateral hydrocephalus. Light microscopy of the CNS revealed extensive axonal swellings principally in the gray matter of the brain stem where the sensory nuclei were most affected. Ultrastructurally, spheroids were identified as axonal terminals and probably dystrophic boutons; they were characterized by accumulations of membrane bound bodies. Clinical and morphological findings are similar to those identified in human infantile neuroaxonal dystrophy (Seitelberger's disease).

Bone marrow hypoplasia in a feminized dog with an interstitial cell tumor

Bone marrow hypoplasia and feminization developed in a 10-year-old male German Shepherd Dog with interstitial cell tumor. Clinical abnormalities included pyrexia, pale mucous membranes, signs of abdominal pain, large left testis, atrophied right testis, and feminization. Abnormal laboratory findings included pancytopenia, bacteremia, bacteriuria, and pyuria. Results of cytologic examination of a bone marrow aspirate were consistent with aplastic anemia. Serum estradiol concentration was high, and serum testosterone concentration was low, compared with normal values for male dogs. The left testicular mass was identified as an interstitial cell tumor. Other causes of the aplastic anemia or feminization were not found.