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[Conjugate deviation in ischemia of medial medullary oblongata--report of three cases]

Yoshimasa Kinoshita1, Hideoki Yasukouchi, Atsukuni Harada

  • 1Department of Neurosurgery, Munakata Suikokai General Hospital, Fukutsu-shi, Fukuoka, Japan.

Brain and Nerve = Shinkei Kenkyu No Shinpo
|March 21, 2007
PubMed

Insights

Medial medullary infarct (MMI), a rare brain stem stroke, can present with eye movement abnormalities and limb weakness. Early diagnosis of vertebral artery issues is key for good prognosis.

Area of Science:

  • Neurology
  • Vascular Neurology
  • Neuroimaging

Background:

  • Medial medullary infarct (MMI) is an uncommon stroke affecting the brainstem.
  • Typical MMI symptoms include contralateral hemiparesis, sensory loss, and ipsilateral hypoglossal nerve palsy.
  • Ocular motor disturbances like conjugate deviation or nystagmus are less common initial MMI symptoms.

Observation:

  • Three cases of medial medullary infarction are presented, all linked to vertebral artery pathologies.
  • Patients experienced vertigo, vomiting, dizziness, and abnormal eye movements (conjugate deviation, nystagmus).
  • Neurological deficits varied, with some cases lacking typical hypoglossal nerve palsy but showing distinct ocular motor findings.

Findings:

  • Cranial MRI and MRA revealed infarcts in the upper medial medulla, associated with vertebral artery thrombosis or dissection.
  • Lesions involved the nucleus prepositus hypoglossi and/or medullary reticular formation, explaining the observed ocular motor abnormalities.
  • All cases, despite initial atypical presentations, showed good prognosis due to prompt identification and management of vertebral artery disease.

Implications:

  • Upper medial medullary infarcts, particularly those involving the vertebral artery, may present with a triad of contralateral hemiparesis, sensory disturbance, and abnormal ocular motor findings.
  • Recognizing these specific clinical and imaging features is crucial for accurate diagnosis and timely intervention in MMI.
  • This study highlights the importance of evaluating vertebral artery status in patients with suspected medial medullary infarction.

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