* whether the materials can be phagocytosed and removed from the body or whether they damage leukocytes and cause the release of inflammatory mediators.</spoiler>

* <spoiler text="What are the birefringent particles seen in the nodules adjacent to the vessels and how did they get there?">The material is talc, which is often used to "cut" street drugs. Intravenous injection of talc leads to some talc being deposited in tissues and initiating an inflammatory response.</spoiler>

{{IPLab 3}}

[[Category:IPLab:Lab 3]]