An Individual with a Majority of Ferruginous Bodies Formed on Chrysotile Cores

A 59-y-old man was exposed to chrysotile asbestos while rebuilding clutches. Analytical electron microscopy showed a chrysotile core in 72% of the ferruginous bodies from lung tissue. Long, uncoated chrysotile fibers were also present. Sufficient exposure to long chrysotile in jobs such as this appears to allow the majority of ferruginous bodies to be formed on chrysotile, an exception to the rule that most ferruginous bodies form on amphibole cores.