This tag is associated with 21 posts

Subarachnoid Hemorrhage

History: 60 year old male with severe headache. This is a case of subarachnoid hemorrhage. Typically sudden onset non-traumatic subarachnoid hemorrhage is the result of a ruptured cerebral aneurysm, however, in this case the distribution of subarachnoid hemorrhage is not typical for a ruptured aneurysm, and may be related to other causes such as supratherapeutic … Continue reading

Fetal Origin of the Posterior Cerebral Artery – My Brain MRI

History: Radiology resident being scanned for a physics lesson has an incidental finding.  This is my brain MRI! The finding is called a fetal origin of the posterior cerebral artery, and it occurs when the embryonic form of the posterior cerebral artery fails to regress. It is a normal variant that occurs on either side … Continue reading

Sinonasal Osteoma

History: 40 year old male with incidental finding on head CT done for minor head trauma.  This is the typical appearance for a Sinonasal Osteoma. Classically they are asymptomatic, and thus are incidental findings on imaging studies done for other reasons. Sinonasal osteomas are the most common benign tumor of the sinuses. They can be … Continue reading

Left Middle Cerebral Artery Stroke – The susceptibility vessel sign

History: 65 year old male with acute onset slurred speech and right hemiparesis.  The susceptibility vessel sign is produced by the presence of deoxyhemoglobin within clot obstructing the left middle cerebral artery in this patient. Some articles have suggested this indicates cardioembolic stroke as an etiology.

Left Internal Carotid Artery Occlusion

History: 70 year old male with acute onset right hemiparesis and slurred speech.  On this CT angiogram of the neck, the left internal carotid artery appears completely occluded, however, technically complete arterial occlusion can only be diagnosed on conventional catheter angiogram by ruling out a possible “string sign.”  This patient went on to have a … Continue reading

Basilar Invagination

History: 30 year old female with a history of bilateral sensorineural hearing loss.  This is the appearance of basilar invagination, of which the differential includes Paget Disease, Osteomalacia, fibrous dysplasia, achondroplasia, rickets, cleidocranial dysplasia and osteogenesis imperfecta. The diagnosis in this case was osteogenesis imperfecta, which also can cause hearing loss.

Cochlear Otosclerosis

History: 30 year old female with a history of hearing loss. The term for this finding is cochlear otosclerosis. Synonyms include cochlear otospongiosis, retrofenestral otosclerosis, and Beethoven Malady. The diagnosis in this case was osteogenesis imperfecta, however, paget disease, fibrous dysplasia, and otosyphillis can cause these findings.

Basal Ganglia Calcifications

History: 85 year old male presents with headache. These calcifications in elderly patients are most likely secondary to normal aging; however, other entities cause bilateral symmetric basal ganglia calcifications. The differential includes congenital infections such as CMV and HIV, and more rare conditions such as MELAS (Mitochondrial encephalomyopathy, lactic acidosis, and stroke-like episodes) in children, … Continue reading


History: 80 year old female with headache. This is a common area for atherosclerotic calcifications in elderly patients.


History: 60 year old female presents with headache. The diagnosis in this case was meningioma, which is the most common extra-axial mass in the adult. Classically they are seen in elderly females, as in this case.