Dear All, I've attached the Question Sheet for Diagnostic Exercise #257, which is contributed by Jonathan C Behlen1, Clinson Lui1, Sarah White1, Shannon Reed1, Travis Mays2, and Raquel Rech1. 1College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77843, USA 2Texas A&M Veterinary Medical Diagnostic Laboratory, Texas A&M University, College Station, TX 77843, USA. Corresponding author: rrech@cvm.tamu.edu Best Regards 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/ --