Question 343
When visually assessing CT perfusion maps (without the aid of automated software) ischemic infarct core is best delineated by which of the following parameters?
Question 344
In cerebral ischemia, the ischemic penumbra is best defined by which of the following combination of parameters?
Question 345
Which of the following changes in CT perfusion parameters is NOT consistent with an ischemic penumbra?
Question 402
In the accompanying axial image from a non-contrast CT of the brain, white matter is indicated by which letter?
Question 403
In the accompanying axial image from a non-contrast CT of the brain, muscle is indicated by which letter?
Question 404
In the accompanying axial image from a non-contrast CT of the brain, cerebrospinal fluid (CSF) is indicated by which letter?
Question 405
In the accompanying axial image from a non-contrast CT of the brain, grey matter is indicated by which letter?
Question 406
In the accompanying axial image from a non-contrast CT of the brain, blood is indicated by which letter?
Question 407
In the accompanying axial image from a non-contrast CT of the brain, bone is indicated by which letter?
Question 466
An elderly, otherwise well, individual presents with a headache and is investigated with an MRI. What is the most likely diagnosis?
Question 501
A 50-year-old woman presents with a gradual decline in cognitive function and is investigated with an MRI. Which of the following most likely describes their cognitive deficit?
Question 508
A 65-year-old female with a proven glioblastoma (IDH-1 wild-type, MGMT methylated) undergoes Stupp protocol combined chemoradiotherapy. Two months after completion of radiotherapy, a follow-up MRI demonstrate a substantial increase in size of a peripheral enhancing component with abundant surrounding vasogenic edema resulting in mass effect. The enhancing component has low cerebral blood volume and spectroscopy demonstrates a dominant lipid and lactate peak, with minimal choline or NAA.
What is the most likely diagnosis?
Question 523
This 3-month old boy presents with increasing head circumference. He underwent a cranial ultrasound. What is the most likely diagnosis?
Question 524
A 4 month-old girl presents with a large mass within the trigone of the lateral ventricle, with associated hydrocephalus. Which of the following is the most likely diagnosis?
Question 525
A 3-year-old girl presents with a headache. She undergoes a contrast enhanced MRI. What is the most likely diagnosis?
Question 526
A 66-year-old woman presents with nausea, headache and vomiting. She undergoes a contrast-enhanced MRI. What is the most likely diagnosis?
Question 534
A 70-year-old female, previously well, presents with vague headaches and undergoes a contrast enhanced MRI. What is the most likely diagnosis?
Question 535
A 20-year-old woman presents with headaches and undergoes a contrast enhanced MRI. What is the most likely diagnosis?
Question 536
An 80-year-old female, with a history of pancreatic carcinoma five years previously, now in remission with no known systemic metastatic disease, presents with headaches. She undergoes a contrast enhanced MRI. What is the most likely diagnosis?
Question 537
A young adult, previously well, presents with headaches. They undergo a contrast-enhanced MRI. What is the most likely diagnosis?