https://doi.org/10.1351/goldbook.13658
Chronic, progressive, generalized granulomatous reticulosis of unknown etiology, involving almost any organ or tissue, including the skin, lungs, lymph nodes, liver, spleen, eyes, and small bones of the hands and feet. It is characterized histologically by the presence in all affected organs or tissues of noncaseating epithelioid cell tubercles.
Note: There is usually diminished or absent reactivity to tuberculin, and in most active cases, a positive Kveim reaction.