title: Subdural hemorrhage: A unique case involving secondary vitamin K deficiency bleeding due to biliary atresia.
abstract: Extrahepatic biliary atresia (EHBA) is a rare disease characterized by progressive and obliterative cholangiopathy in infants and is one of the major causes of secondary vitamin K deficiency bleeding (VKDB) due to cholestasis-induced fat malabsorption. Breast feeding increases the tendency of bleeding in EHBA patients because breast milk contains low amounts of vitamin K. A 2-month-old female infant unexpectedly died, with symptoms of vomiting and jaundice prior to death. She had been born by uncomplicated vaginal delivery and exhibited normal growth and development with breastfeeding. There was no history of trauma. She received vitamin K prophylaxis orally. In an emergency hospital, a CT scan showed a right intracranial hematoma and mass effect with midline shift to the left. In the postmortem examination, severe atresia was observed in the whole extrahepatic bile duct. Histologically, cholestasis, periductal fibrosis, and distorted bile ductules were noted. The gallbladder was not identified. A subdural hematoma and cerebellar tonsillar herniation were found; however, no traumatic injury in any part of the body was observed. Together, these findings suggest that the subdural hemorrhage was caused by secondary vitamin K deficiency resulting from a combination of cholestasis-induced fat malabsorption and breastfeeding. Subdural hemorrhage by secondary VKDB sometimes occurs even when vitamin K prophylaxis is continued. This case demonstrated that intrinsic factors, such as secondary VKDB (e.g., EHBA, neonatal hepatitis, chronic diarrhea), should also be considered in infant autopsy cases presenting with subdural hemorrhage.
authors.affiliation: Department of Forensic Medicine and Molecular Pathology, Kyoto University Graduate School of Medicine, Kyoto, Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Miyao
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Abiru
authors.forename: Munetaka
authors.initials: M
authors.lastname: Ozeki
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Kotani
authors.forename: Tatsuaki
authors.initials: T
authors.lastname: Tsuruyama
authors.forename: Naho
authors.initials: N
authors.lastname: Kobayashi
authors.forename: Tadaki
authors.initials: T
authors.lastname: Omae
authors.forename: Toshio
authors.initials: T
authors.lastname: Osamura
authors.forename: Keiji
authors.initials: K
authors.lastname: Tamaki
mesh_terms: D017734:Bile Ducts, Extrahepatic / Q000473:pathology; D001656:Biliary Atresia / Q000150:complications* / Q000473:pathology; D001651:Cholestasis, Extrahepatic / Q000150:complications; D004677:Encephalocele / Q000473:pathology; D005260:Female; D005355:Fibrosis / Q000473:pathology; D049429:Forensic Pathology; D006408:Hematoma, Subdural / Q000209:etiology* / Q000473:pathology; D006801:Humans; D007223:Infant; D008103:Liver Cirrhosis / Q000473:pathology; D014812:Vitamin K / Q000627:therapeutic use; D014813:Vitamin K Deficiency / Q000150:complications* / Q000188:drug therapy / Q000209:etiology; D014815:Vitamins / Q000627:therapeutic use
chemical_list: D014815:Vitamins; D014812:Vitamin K