title: A case report of syndrome of inappropriate antidiuretic hormone secretion with Castleman's disease and lymphoma.
abstract: BACKGROUND
  Syndrome of inappropriate antidiuretic hormone secretion (SIADH) is a common cause of hyponatremia in hospitalized patients and is often described in patients with small-cell carcinoma of the lung. In this report, we described both Castleman's disease and lymphoma coexisting in one patient with SIADH.
  
  
  METHODS
  A 70-year-old Chinese woman with a history of diabetes mellitus and insulin therapy had severe hyponatremia and gastrointestinal symptoms. Through a series of examinations, common causes such as pulmonary carcinoma were excluded. An abdominal mass was detected by computed tomography. Although the peripheral lymph node biopsy showed the pathological result as Castleman's disease, the pathology of the abdominal lymph node revealed diffuse large B-cell lymphoma. After chemotherapy, the hyponatremia was treated during a period of follow-up.
  
  
  CONCLUSIONS
  This patient presented with the rare clinical condition of inappropriate antidiuretic hormone secretion alongside Castleman's disease and lymphoma. Asymptomatic hyponatremia may persist for some time suggesting that clinical physicians should pay attention to the mild cases of hyponatremia. We also hypothesized that Castleman's disease is a condition of pre-lymphoma with both having the ability to cause SIADH. The possibility of lymphoma as well as Castleman's disease triggering the development of SIADH should also be taken into consideration for conducting recurrent biopsies.
authors.affiliation: Department of Endocrinology, Tianjin Medical University General Hospital, No 154 Anshan Road, Heping District, Tianjin, 300052, China. meichuqin@yahoo.com.cn.
authors.forename: Chong-Gui
authors.initials: CG
authors.lastname: Zhu
authors.forename: Qiu-Zi
authors.initials: QZ
authors.lastname: Zhang
authors.forename: Mei
authors.initials: M
authors.lastname: Zhu
authors.forename: Qiong-Li
authors.initials: QL
authors.lastname: Zhai
authors.forename: Xiao-Yu
authors.initials: XY
authors.lastname: Liang
authors.forename: Zong-Hong
authors.initials: ZH
authors.lastname: Shao
authors.forename: Emily C
authors.initials: EC
authors.lastname: Ver Hoeve
authors.forename: Hui-Qi
authors.initials: HQ
authors.lastname: Qu