Francis Deng ◉

What tumor is most commonly reported to cause neoplastic intracranial aneurysms?

A CT report for facial trauma contains the following findings: "There is a mildly comminuted fracture involving the left frontal process of the maxilla and left nasal bone. Fracture lines in this region extend from the pyriform aperture across the medial maxillary buttress to the left inferior orbital rim, sparing the infraorbital canal. However, minimally displaced fractures involve the medial third of the orbital floor, internal orbital buttress, and the lamina papyracea. There is less than 0.5 mm outward herniation of extraconal fat into the ethmoid labyrinth. One of the fracture lines extends anteriorly to the frontomaxillary suture, liberating a minimally displaced fragment of bone containing the lacrimal fossa, which appears intact. The left lateral orbital wall is intact. There is a fracture of the medial wall of the maxillary sinus but not the lateral wall."

What classification best summarizes the most significant injuries?

A patient without prior medical history was involved in a motor vehicle collision and arrives obtunded. The patient undergoes noncontrast CT of the head and cervical spine. At the acquisition scanner, you identify scattered convexal subarachnoid hemorrhage and fractures of the right petrous temporal bone, characterized as otic-capsule sparing, coursing to the sigmoid plate, and not clearly involving the petrous carotid canal on that side. Based on this information, which of the following imaging tests is the most appropriate next step?

In a patient with infective endocarditis, which of the following locations is the most likely location of a mycotic (infectious) aneurysm?

A patient with untreated HIV (human immunodeficiency virus) infection in a developed country presents with altered mental status. Neuroimaging reveals multiple brain lesions associated with edema, contrast enhancement, and mass effect. What are the two most likely possibilities in the differential diagnosis?

A 25-year-old man with history of polysubstance use disorder presents with confusion and is assessed with the MRI shown. What is the most likely diagnosis?

A 14-year-old with acute lymphoblastic leukemia presents with acute right hemiplegia and is evaluated with brain MRI. What is the most likely diagnosis?