JOURNAL ARTICLE

[Surgical Case of Accidental Infantile Acute Subdural Hematoma Caused by Household Minor Head Trauma:Hyperperfusion during Postoperative Hemispheric Hypodensity, Namely "Big Black Brain"]

Junichi Yoshimura, Manami Morikawa, Shunsuke Kumagai, Taiki Saito, Haruhiko Takahashi, Hidemoto Fujiwara, Ryosuke Ogura, Naoto Tsuchiya
No Shinkei Geka. Neurological Surgery 2020, 48 (9): 841-847
32938813
We experienced a case of an accidental infantile acute subdural hematoma caused by household minor head trauma(Nakamura type I intracranial hemorrhage)with postoperative hemispheric hypodensity lesion(Big Black Brain)whose pathophysiology was analyzed using perfusion MRI. A ten-month-old boy was admitted to our hospital in a comatose state. His mother revealed that the boy suffered a fall from a sofa bed. A CT scan indicated massive acute subdural hematoma in the left cerebral hemisphere. Emergency craniotomy and hematoma evacuation were performed. On postoperative day 3, CT revealed hemispheric hypodensity, and the boy suffered from status epilepticus. MRI on the following day showed widespread white matter hyperintensity in diffusion-weighted images, and MRA demonstrated dilation of the middle cerebral artery. Perfusion MRI using the dynamic susceptibility contrast method revealed a marked increase in cerebral blood flow in the left hemisphere. These abnormal MRI and MRA findings disappeared on postoperative day 13. Status epilepticus also improved upon administration of multi-antiepileptic drugs. Fundoscopy findings on postoperative day 3 showed small bilateral petechial or brush retinal hemorrhages. However, whole-body examination did not show any problems, and was consistent with the mother's account. Thus, we judged non-abusive head trauma. Although follow-up MRI showed diffuse atrophy of the left cerebral hemisphere, the boy aged well without obvious paresis or verbal developmental delay as judged by a follow-up more than a year later. Based on these results, we speculated that hyperperfusion caused by dilation of the cerebral artery was related to the postoperative hemispheric hypodensity, namely "Big Black Brain".

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