Posts tagged MRI
Posts tagged MRI
MRI scans of a Human brain.
Arcuate sign - a subtle but important avulsion fracture of the proximal fibula at the site of arcuate ligament complex insertion. It is associated with cruciate ligament injury in around 90% of cases and represents an unstable posterolateral corner injury. When detected, the arcuate sign should prompt further evaluation with MRI and referral to an orthopaedic surgeon.
Striking new MRI images show that for twins, sibling rivalry starts early–even before birth. Researchers in London were trying to find out more about a rare blood disease that can complicate the pregnancies for women carrying twins, when they captured video of what appears to be two fetuses pushing each other as they try to make more room.
MRI of twins. Click for video
Haemosiderin cap sign - a spinal tumour appearance where a cap of hypointense haemosiderin is seen on T2 weighed imaging above and / or below the tumour due to previous haemorrhage. It is most often associated with spinal ependymomas, being seen in 20-33% of these cases. The sign however may also be seen in hemangioblastomas and paragangliomas and therefore while it is highly suggestive of ependymoma it is not pathognomonic.
See our YouTube video tutorial on ‘Spinal Ependymoma’ here.
MRI Scan - Whole Body
Acoustic neuroma - a relatively common type of schwannoma arising from the vestibulocochlear nerve (CN VIII). It typically presents with sensorineural hearing loss or tinnitus and accounts for 75 - 90% of cerebellopontine angle masses. Extension into the internal acoustic canal is a major differentiating feature and results in a trumpeted appearance of the canal and a classic ice-cream cone appearance with the portion outside the canal representing the ice-cream. When seen bilaterally, acoustic neuromas are strongly suggestive of neurofibromatosis type 2.
Butterfly glioma - name given to a high grade astrocytoma, usually a glioblastoma multiforme, which crosses the corpus callosum. The tumor projections extending out from the midline simulate butterfly wings. These tumors most frequently occur in the frontal lobes and like all high grade gliomas the prognosis is poor. Rarely cerebral metastases, tumefactive demyelination, lymphoma or cerebral toxoplasmosis may mimic this appearance.
Sight. MRI of the sight zone in the human brain.