WBR0612
| Author | [[PageAuthor::Rim Halaby, M.D. [1]]] |
|---|---|
| Exam Type | ExamType::USMLE Step 1 |
| Main Category | MainCategory::Anatomy, MainCategory::Pathophysiology |
| Sub Category | SubCategory::Neurology |
| Prompt | [[Prompt::A 65-year-old right-handed man with history of poorly controlled hypertension and dyslipidemia is brought by his wife to the emergency department for sudden onset of right upper extremity paralysis and loss of sensation. Brain MRI is shown below. Which of the additional findings is most likely to be present in this patient?
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| Answer A | AnswerA::Paralysis of the right lower extremity |
| Answer A Explanation | [[AnswerAExp::A stroke in the left MCA does not lead to paralysis of the right lower extremity, in fact, a stroke in the left anterior cerebral artery (ACA) may lead to paralysis of the right lower extremity.]] |
| Answer B | AnswerB::Loss of sensation on the left side of the face |
| Answer B Explanation | AnswerBExp::A stroke in the left MCA may lead to loss of sensation on the contralateral right side of the face and not the left side of the face. |
| Answer C | AnswerC::Hemineglect |
| Answer C Explanation | [[AnswerCExp::A stroke in the MCA in the non dominant right side of the brain may lead to hemineglect while a stroke in the MCA in the dominant left side of the brain may lead to aphasia.]] |
| Answer D | AnswerD::Abnormal gait |
| Answer D Explanation | AnswerDExp::Strokes in the posterior circulation and not in the MCA may lead to abnormal gait. |
| Answer E | AnswerE::Speech impairment |
| Answer E Explanation | [[AnswerEExp::A stroke in the MCA in the dominant left side of the brain may lead to aphasia.]] |
| Right Answer | RightAnswer::E |
| Explanation | [[Explanation::The patient in this scenario is presenting with right upper extremity hemiplegia and hemiparesis suggestive of a stroke in the middle cerebral artery (MCA). The MRI of the brain confirms a stroke in the MCA territory. A stroke in the dominant right lobe classically leads to contralateral right sided hemiplegia and hemiparesis in the upper extremity and right side of the face as well as aphasia. Patients may present with any combination of these symptoms. A stroke in the MCA territory of the non dominant right lobe might lead to hemineglect.
 Educational Objective: A stroke in the dominant right lobe might lead to contralateral right sided hemiplegia and hemiparesis in the upper extremity and right side of the face as well as aphasia. |
| Approved | Approved::Yes |
| Keyword | WBRKeyword::Stroke, WBRKeyword::Aphasia, WBRKeyword::MCA, WBRKeyword::Middle cerebral artery, WBRKeyword::Ischemic stroke, WBRKeyword::Speech impairment |
| Linked Question | Linked:: |
| Order in Linked Questions | LinkedOrder:: |