| Summary points: | A 60-year-old man who underwent right-shoulder arthroscopy for a right shoulder rotator cuff repair presents approximately 3 weeks later with pain, swelling, and purulent drainage from his right shoulder. The authors describe their course of treatment and patient follow-up, which included a significant drop in platelet count at week 3. The authors discuss the causes, features, and diagnosis of vancomycin-induced thrombocytopenia. |