Dear All, Attached is the Answer Sheet for Diagnostic Exercise # 251, contributed by Ariadni Kotzias Bandeira, Silvio C. Fonseca, and Fábio S. Mendonça from the Laboratory of Animal Diagnosis, Federal Rural University of Pernambuco, Recife, PE, Brazil. *Corresponding author*: fabio.mendonca@ufrpe.br Claudio 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/