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Primary brain stem lesions caused by closed head injuries

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Abstract

Traumatic lesions of the brain stem are of two types: primary, which are considered to be caused at the moment of impact, and secondary, associated with supratentorial mass lesion. Of the 239 patients with a serious head injury who showed a severe disturbance of consciousness upon admisision and who had CT scan carried out immediately, 21 cases were considered to have a primary brain stem lesion with initial CT scan. A primary brain stem lesion was found in 21 of 239 (8.8%) of patients with serious head injury. Their injuries were caused primarily by traffic accidents. Sixteen of the 21 cases showed not only brain stem lesions but also other brain injuries such as cerebral contusion of the white and gray matter, callosal injury, intraventricular hemorrhage, and subarachnoid hemorrhage, which are considered to be caused by a diffuse shearing injury. Five cases who showed a single injury to the brain stem with no other brain lesions were considered to have a pure brain stem lesion. Primary brain stem lesions were observed on the dorsal side of the midbrain, where they can be differentiated from secondary brain stem lesions. These lesions are considered to result from the shearing mechanism in and around the brain stem very close to the tentorial edge, or to an injury of the lower brain stem by hyperextension of the cervical vertebrae. The prognosis of patients with a primary brain stem lesion was usually unfavorable, except in those with a single brain stem lesion.

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Authors and Affiliations

  1. Department of Neurosurgery, Jikei University School of Medicine, Tokyo, Japan

    Takuo Hashimoto & Norio Nakamura

  2. Department of Neurosurgery, Faculty of Medicine, Cologne University, Fed. Rep. of Germany

    Karl-Eduard Richard & Reinhold A. Frowein

Authors
  1. Takuo Hashimoto
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  2. Norio Nakamura
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  3. Karl-Eduard Richard
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  4. Reinhold A. Frowein
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Hashimoto, T., Nakamura, N., Richard, KE. et al. Primary brain stem lesions caused by closed head injuries. Neurosurg. Rev. 16, 291–298 (1993). https://doi.org/10.1007/BF00383839

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  • DOI: https://doi.org/10.1007/BF00383839

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