Dear All, Attached is the *Answer Sheet *for Diagnostic Exercise #*264 *contributed by Carmen García-Romero, 1 Elena Colombino, 1 Arturo Oliver-Guimera, 1 Agustín Barragán, 1 David Viana, 1 Juan Manuel Corpa, 1 Joaquín Ortega, 1 Laura Selva, 1 Francisco A. Uzal,2 Estefania Montero.1 1 Veterinary Pathology Service. School of Veterinary Medicine, Department of Animal Production and Health, Public Veterinary Health and Food Science and Technology, Universidad Cardenal Herrera-CEU, CEU Universities, Valencia, Spain. 2 California Animal Health and Food Safety Laboratory System, San Bernardino Branch, School of Veterinary Medicine, University of California-Davis, San Bernardino, CA, USA. **Corresponding author*: carmen.garciaromero@uchceu.es The Diagnostic Exercises are an initiative of the Latin Comparative Pathology Group (LCPG), the Latin American subdivision of The Davis-Thompson Foundation. Members and non-members from any country of residence may contribute to these exercises. Please consider contributing a case to this initiative. It doesn't have to be unusual, and all pathology subspecialties are welcome! Please consult the instructions on how to format and submit your DE at https://davisthompsonfoundation.org/diagnostic-exercises-instructions/ Previous cases are available at https://davisthompsonfoundation.org/diagnostic-exercise/