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Shitomi, Yuki; Nishida, Haruto; Kusaba, Takahiro; Daa, Tsutomu; Yano, Shinji; Arakane, Motoki; Kondo, Yoshiyuki; Nagai, Takayuki; Abe, Takashi; Gamachi, Ayako; Murakami, Kazunari; Etoh, Tsuyoshi; Shiraishi, Norio; Inomata, Masafumi; Yokoyama, Shigeo
Pathology international, August 2017, 2017-Aug, 2017-08-00, 20170801, Letnik: 67, Številka: 8Journal Article
Lanthanum carbonate (LaC) is used to prevent hyperphosphatemia in dialysis patients. It is commonly believed that there is little LaC absorption from the intestines. However, La deposition in the gastric mucosa, which we coined “gastric lanthanosis”, was recently reported. We describe here the clinicopathological features of and a possible mechanism for gastric lanthanosis. This study included 23 patients with definite gastric lanthanosis. We extracted characteristic clinicopathological features of gastric lanthanosis by computed tomography (CT) imaging and endoscopic, histologic, electron‐microscopic, and element analysis examinations. The Helicobacter pylori infection rate in the lanthanosis group was much lower than that among the general population. The clinicopathological features characteristic of gastric lanthanosis were mucosal high‐density linear appearance by CT, reflective bright‐white spots (BWS) by gastroscopy, eosinophilic histiocytes occasionally phagocytizing foreign materials by histology, and numerous electron‐dense particles in the histiocytes. The particles had burr‐like skeletons resembling La crystals. Gastric lanthanosis is an under‐reported, but not a rare lesion. It is characterized by endoscopic BWS and histologic eosinophilic histiocytes in dialysis patients treated with LaC. The proposed mechanism for gastric lanthanosis is that LaC is dissolved by gastric juice, crystallized within the mucosa and is phagocytized by histiocytes.
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