Dear All, Attached is the *Question Sheet *for Diagnostic Exercise #*266 *contributed by Bruno Camilo de Souza1, João Paulo da Silva Cavasani1, Wuglenya Daislla Martins da Silva1, Caroline Argenta Pescador1, Edson Moleta Colodel1, Fernando Henrique Furlan1*. 1Veterinary Pathology Laboratory, Veterinary Hospital, Federal University Of Mato Grosso, Brazil. *1***Corresponding author: *fernando.furlan@ufmt.br 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 does not have to be unusual, and all pathology sub-specialties are welcome! Please consult 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/