title: Subdural hygromas after bone marrow transplantation: results of a prospective study.
abstract: BACKGROUND
  Subdural hygromas after bone marrow transplantation (BMT) have been occasionally found in patients with persisting headache and vomiting. We assessed the incidence of subdural hygromas after BMT and tried to define possible risk factors associated with this complication.
  
  
  METHODS
  Fifty bone marrow graft recipients surviving more than 30 days were consecutively enrolled into a prospective study. Cranial CT scans were performed before and 30 days after BMT. Clinical data and symptoms were recorded daily during the first 30 days after BMT. In patients with subdural hygromas, a magnetic resonance imaging scan and monthly follow-up cranial computed tomography scans were performed until fluid collections had resolved completely.
  
  
  RESULTS
  In 9 of the 50 patients (18%) who survived 30 days after transplantation, newly acquired subdural hygromas were found. Patients with hygromas suffered significantly longer and more severely from headache and vomiting (P=0.01). Application of intrathecal methotrexate and arterial hypertension occurred significantly more often in patients with hygromas (P=0.01). In a stepwise logistic regression model, arterial hypertension and intrathecal methotrexate application were the only independent risk factors for the development of hygromas. Monthly follow-up cranial computed tomography scans showed that all hygromas resolved completely after a median of 60 days after diagnosis (range: 30-120 days).
  
  
  CONCLUSIONS
  Subdural hygromas are a frequent complication after BMT within the first 30 days after transplantation. They are reversible and disappear within 2-3 months. The need for routine application of intrathecal methotrexate in standard risk leukemia patients should be critically addressed. Furthermore, close monitoring of blood pressure and immediate antihypertensive therapy might contribute to avoid formation of subdural hygromas.
authors.affiliation: Department of Internal Medicine I, University of Vienna, Austria.
authors.forename: T
authors.initials: T
authors.lastname: Staudinger
authors.forename: K
authors.initials: K
authors.lastname: Heimberger
authors.forename: W
authors.initials: W
authors.lastname: Rabitsch
authors.forename: B
authors.initials: B
authors.lastname: Schneider
authors.forename: H T
authors.initials: HT
authors.lastname: Greinix
authors.forename: S
authors.initials: S
authors.lastname: Nowzad
authors.forename: S
authors.initials: S
authors.lastname: Brugger
authors.forename: E
authors.initials: E
authors.lastname: Reiter
authors.forename: F
authors.initials: F
authors.lastname: Keil
authors.forename: K
authors.initials: K
authors.lastname: Lechner
authors.forename: P
authors.initials: P
authors.lastname: Kalhs
mesh_terms: D000293:Adolescent; D000328:Adult; D016026:Bone Marrow Transplantation; D005260:Female; D006801:Humans; D018191:Lymphangioma, Cystic / Q000175:diagnosis / Q000209:etiology*; D008279:Magnetic Resonance Imaging; D008297:Male; D008577:Meningeal Neoplasms / Q000175:diagnosis / Q000209:etiology*; D008875:Middle Aged; D011183:Postoperative Complications; D011446:Prospective Studies; D011859:Radiography; D013355:Subdural Space / Q000000981:diagnostic imaging / Q000473:pathology