title: [Factor X deficiency and systemic amylosis].
abstract: The case of a 52-year-old patient with systemic amylosis diagnosed upon examination of an osteomedullary biopsy specimen is reported. The most prominent clinical manifestation was a major hemorrhagic syndrome which was recognized as being a result of severe factor Stuart deficiency. The new classification of amyloses based on the latest biochemical and immunological findings is recalled. Current physiopathogenic speculations put emphasis on plasmocyte-macrophage cooperation. Lastly, factor Stuart deficiency, which is as classical as it is uncommon, could originate in the particular affinity of amyloid fibers for this factor and in a "mass effect" (quantity of amyloid substance directly exposed to blood flow), explaining why splenectomy is effective in some instances.
mesh_terms: D000682:Amyloid / Q000096:biosynthesis; D000686:Amyloidosis / Q000150:complications* / Q000503:physiopathology; D005171:Factor X Deficiency / Q000209:etiology*; D006801:Humans; D007020:Hypoprothrombinemias / Q000209:etiology*; D008297:Male; D008875:Middle Aged
chemical_list: D000682:Amyloid
vernacular_title: Déficit en facteur X et amylose systémique.