Dear All, Attached is the *Question Sheet *for Diagnostic Exercise #*263 *contributed by Sydney R. Buckner1,2; Erin E. Edwards, DVM, DACVP1, Mindy M. Borst, LVT1; Kendall L. Langsten, DVM, PhD, DACVP1,2 1Texas A&M Veterinary Medical Diagnostic Laboratory (TVMDL), College Station, TX 77843, USA 2College of Veterinary Medicine and Biomedical Sciences, Veterinary Education, Research, and Outreach, Texas A&M University, Canyon, TX 79015, USA *Corresponding author:* klangsten@tamu.edu 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 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/