Standard chest ILO radiograph of small "p" nodular opacities

This is a standard International Labour Organization (ILO) radiograph demonstrating a profusion of small, rounded opacities designated "p" for ≤1.5 mm. The ILO description of this radiograph is "p/p" meaning that all or virtually all of the opacities are size "p"; if most of the opacities are "p", but some are "q", then the designation "p/q" would be used. The scale for the concentration of opacities ranges from "0", meaning no opacities, to "3", meaning profuse. The degree of profusion of the small opacities in this radiograph is designated "3/3", as the profusion is exactly consistent with "3". If the reader thought the profusion looked mostly like a standard "3", but also considered the possibility that it was consistent with a standard radiograph with a profusion of "2", the profusion would be designated "3/2".