title: Mid-diaphyseal Endosteal Thickening With Subsequent Medullary Narrowing in a Patient With Hallermann-Streiff Syndrome.
abstract: We report on a 5-year-old girl who presented with the full clinical criteria of Hallermann-Streiff syndrome (HSS). Classically, overtubulation (thin and gracile) bones are the characteristic and constant features in HSS. Interestingly, our present patient manifested unusual mid-diaphyseal endosteal thickening with subsequent medullary narrowing (defective endosteal resorption). To the best of our knowledge no previous reports described such unusual feature in a patient with HSS.
  
  
  BACKGROUND
  Hallermann-Streiff syndrome; Mid-diaphyseal thickening; Radiology.
authors.affiliation: Ludwig Boltzmann Institute of Osteology at the Hanusch Hospital of WGKK and AUVA Trauma Centre Meidling, First Medical Department, Hanusch Hospital, Vienna, Austria.
authors.forename: Ali Al
authors.initials: AA
authors.lastname: Kaissi
authors.forename: Albert
authors.initials: A
authors.lastname: Handelbauer
authors.forename: Klaus
authors.initials: K
authors.lastname: Klaushofer
authors.forename: Franz
authors.initials: F
authors.lastname: Grill