Image challenge in Veterinary Pathology

Image 1.

Cat, brain. Tissue sample to confirm the diagnosis?

A. Heart

Image 2.

White-tailed deer (Odocoileus virginianus), cranial cavity. Most likely diagnosis?

A. Parelaphostrongylus tenuis

Image 3.

Dog, brain. Characteristic histologic findings?

A. Physaliferous cells

Image 4.

Image 4.Horse, brain. Cause?

A. Eastern equine encephalitis virus

Answers are provided in Veterinary Pathology 62(4): pages 602–603.