Segmental lumbar spinal cord aplasia in a free-ranging southern tiger cat (Leopardus guttulus)

Aplasia segmentar da medula espinhal lombar em um gato-do-mato-pequeno (Leopardus guttulus)

ABSTRACT:

We report a case of a free-ranging five-month wildcat with bilateral hind limbs paralysis since birth due to a segmental lumbar spinal cord aplasia. The species confirmation of the southern tiger cat (Leopardus guttulus) was determined by genetic sequencing. This southern tiger cat native to Brazil had autophagy in both pelvic limbs during the initial phase of hospitalization, followed by a right tibial fracture with bone exposition. Euthanasia was chosen due to animal welfare and submitted for postmortem examination. Grossly, there was an 8.5cm in-length segmental interruption of the spinal cord between the third and fifth lumbar vertebrae, with a lack of spinal cord tissue and collapsed associated dura mater. Microscopically, the representative sections of the L3 to L5 spinal cord had only .an irregular trace of gray matter adhered to the meninges (lumbar spinal cord aplasia) In the region of L6, a focally extensive, cystic, and well-defined tubular cavitation was noted dorsally to the central canal, replacing and compressing the adjacent nervous tissue (syringomyelia). Metagenomics examination did not detect any virus responsible for the presented spinal cord malformations. This seems to be the first description of segmental spinal cord aplasia reported in a wild feline.

INDEX TERMS:
Biodiversity conservation; feline medicine; veterinary pathology; central nervous system; spinal cord; Leopardus guttulus