title: High serum levels of somatomedin-C and diabetes mellitus caused by obstructive hydrocephalus: case report.
abstract: OBJECTIVE
  This case demonstrates a relationship between hydrocephalus with a huge diverticulum of the third ventricle and high serum levels of somatomedin-C. Somatomedin-C levels become high when the secretion of growth hormone from the adenohypophysis increases, and previous reports state that hydrocephalus decreases the secretion of growth hormone.
  
  
  METHODS
  The patient suffered from diabetes mellitus and obesity, and serum somatomedin-C levels were high. A pituitary adenoma or ectopic growth hormone-producing tumor was suspected. Magnetic resonance imaging did not reveal either of these abnormalities but indicated hydrocephalus with a diverticulum of the third ventricle.
  
  
  METHODS
  After ventriculoperitoneal shunt placement, the blood glucose and serum somatomedin-C levels of the patient decreased toward normal. Six months later, the shunt tube became obstructed and serum somatomedin levels increased. The levels decreased again after shunt revision.
  
  
  CONCLUSIONS
  To our knowledge, this is the first published report of obstructive hydrocephalus with a diverticulum of the third ventricle compressing the hypothalamus and increasing the serum levels of somatomedin-C.
authors.affiliation: Department of Neurosurgery, Kanto-Rosai Hospital, Kawasaki, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Okada
authors.forename: S
authors.initials: S
authors.lastname: Kawamoto
authors.forename: S
authors.initials: S
authors.lastname: Yoshida
mesh_terms: D000236:Adenoma / Q000175:diagnosis; D000293:Adolescent; D001927:Brain Diseases / Q000175:diagnosis; D003560:Cysts / Q000175:diagnosis; D003922:Diabetes Mellitus, Type 1 / Q000150:complications*; D003937:Diagnosis, Differential; D004172:Diplopia / Q000209:etiology; D013354:Empyema, Subdural / Q000209:etiology / Q000382:microbiology; D016983:Enterococcus / Q000302:isolation & purification; D005260:Female; D015522:Frontal Sinusitis / Q000150:complications / Q000382:microbiology / Q000601:surgery; D007987:Gonadotropin-Releasing Hormone; D016908:Gram-Positive Bacterial Infections / Q000150:complications / Q000382:microbiology / Q000601:surgery; D013007:Growth Hormone-Releasing Hormone; D006261:Headache / Q000209:etiology; D006429:Hemiplegia / Q000209:etiology; D019382:Human Growth Hormone / Q000378:metabolism; D006801:Humans; D006849:Hydrocephalus / Q000175:diagnosis / Q000209:etiology* / Q000601:surgery; D007030:Hypothalamo-Hypophyseal System / Q000503:physiopathology; D007031:Hypothalamus / Q000378:metabolism / Q000473:pathology; D007334:Insulin-Like Growth Factor I / Q000032:analysis* / Q000378:metabolism; D008279:Magnetic Resonance Imaging; D010903:Pituitary Gland, Anterior / Q000378:metabolism; D010907:Pituitary Hormones / Q000378:metabolism; D010911:Pituitary Neoplasms / Q000175:diagnosis; D012636:Secretory Rate; D012640:Seizures / Q000209:etiology; D013973:Thyrotropin-Releasing Hormone; D017287:Ventriculoperitoneal Shunt
chemical_list: D010907:Pituitary Hormones; D019382:Human Growth Hormone; D007987:Gonadotropin-Releasing Hormone; D013973:Thyrotropin-Releasing Hormone; D007334:Insulin-Like Growth Factor I; D013007:Growth Hormone-Releasing Hormone