### Patient: Doctor, I've been experiencing joint stiffness and tightness, along with fatigue. Also, I've noticed a strange lump or mass on my knee. What could be the problem?
### Doctor: Based on your symptoms, it's possible that you have a fat embolism. This occurs when small globs of fat circulate in your blood and become lodged in your blood vessels, leading to restricted blood flow and reduced oxygen supply to your tissues.