An 85-year-old man presents with complaints of per rectal bleeding, diarrhea and abdominal pain. Subsequently, he underwent contrast-enhanced CT abdomen which showed findings consistent with ischemic colitis. Which of the following is NOT usually seen in ischemic colitis?

A 10-year-old boy presents with a history of abdominal pain and constipation. A contrast-enhanced CT of the abdomen and pelvis was acquired. A single CT coronal image is provided. The boy is at risk of developing which of the following conditions?

A 20-year-old female presents with right flank pain and a high-grade fever. A selected image from a CTU is shown. What is the most likely diagnosis?

All the following points may be the etiologies of a striated nephrogram on CTU EXCEPT...

Which of the following statements is TRUE regarding new generation endosaccular occlusion devices (e.g. woven endovascular bridge), compared with standard aneurysm coiling?

The anterior choroidal artery arises from the... 

A young man with sickle cell anemia presented to the emergency department with a 2-day history of severe headache and head swelling. His neurological examinations, including fundoscopy and CSF analysis, were within normal limits. An MRI brain was performed. What is the most likely diagnosis?

Which of the following statements regarding the usual origin of cerebral vessels is NOT correct?

An endoleak through a defective portion of an endoluminal stent is classified as a...

What vessel is indicated by the blue arrow?

An 85-year-old woman with a history of dysphagia. A barium meal was performed. What is the most likely diagnosis shown on this selected image?

A 40-year-old man with end-stage renal failure suffers acute features consistent with a pontine infarct. A CT demonstrates the following features. What is the most likely underlying condition?

Which of the following factors is a predictor of a relatively better outcome in ischemic stroke?

In the accompanying diagram of the interhemispheric surface of the cerebral hemisphere, which letter corresponds to the calcarine sulcus? 

A 35-year-old woman presents with a gradually worsening headache with nausea and vomiting. Upon arrival at the emergency department, she undergoes a non-contrast CT of the brain (shown below). 

What is the most appropriate next imaging investigation? 

A 75-year-old woman presents with leg weakness. What is the best interpretation of the findings on this image from a head CT with intravenous contrast?

What vascular abnormality is demonstrated in the accompanying image (axial MRA, lateral DSA)? 

All of the following could be an underlying predisposing factor for this patient, EXCEPT...

All the following situations may be considered as risk factors for intracranial atherosclerotic disease (ICAD) EXCEPT... 

Chest radiograph of a young adult. The outline of what normal structure is indicated by the arrows?