Dear All, Attached is the *Question Sheet *for Diagnostic Exercise #* 273**, * contributed by Carmina Migoni1, Michelle Rubio Sánchez2, Francisco A. Uzal3, Javier Asin3, Eileen Henderson3*. 1 Instituto de Investigaciones en Ciencias Veterinarias, Universidad Autónoma de Baja California, México. 2 Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, México. 3 California Animal Health and Food Safety Laboratory System, San Bernardino Branch, University of California-Davis. **Corresponding author:* eehenderson@ucdavis.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 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/