Quiz 07/12/2022

A 13-year-old girl presents with headache, confusion, and polyuria. MRI brain with contrast shows a heterogeneous, contrast-enhancing lesion with mass effect located in the pineal region. A biopsy was performed. Immunohistochemical staining for cKIT of the biopsied tissue is shown below. Which of the following is the most likely diagnosis?

A lesion to which of the following arteries could produce the ischemic findings shown in the MRI below (Brain MRI, axial cuts. Left: DWI sequence. Right: ADC sequence).

A 63-year-old female presents to the office, accompanied by her husband who has become increasingly worried about his wife’s ability to perform tasks at home. He states that for the past three months she has not been able to tie her shoes, and fumbles with the shoelaces in her hands. Additionally, within the past month, she has not been able to brush her teeth, and simply holds the toothbrush in her hand, without moving. Lastly, her husband has noticed that the patient moves slower on their morning walks together, and her arms and legs seem more tight and rigid. A brain MRI is ordered which shows asymmetric atrophy of the superior parietal lobule. Which of the following is the most likely diagnosis?

A 67-year-old man presents urgently to the emergency room with an acute onset of left-sided weakness and numbness. A CT head was performed and shown below. What is the most likely etiology of the patient’s symptoms?

Identify the lesion shown in the image below.