In his essay, Dr. Truog recounted the boy's grim medical history: he had been born with a large encephalocele, in which the brain and the membranes surrounding it protrude through an opening in the skull.
Because of the tight coupling between the brain and the nerves surrounding the chromatophores, this remarkable transformation happens at lightning speed, allowing wild cuttlefish to quickly change colour to evade predators, sneak up on prey, or attract mates.
This technique enables the graphical depiction of structures such as the brain, the spinal cord, and the surrounding soft tissues [ 1- 3].
Enhancement was observed predominantly in basal areas of the brain and surrounding the ventricles with fewer regions of enhancement in the cortex.
Control tissue sections (meningioma biopsy specimens) and the surrounding brain area of malignant gliomas were devoid of immunoreactivity.
The enhancement artefact caused by differences in attenuation of the resection cavity fluid and the surrounding brain is the most dominating surgically induced ultrasound artefact.
Histology and immunohistochemistry revealed a malignant lymphoma (B-cell lymphoma), and showed the border between the target lesion and the surrounding brain (Fig. 2) as predicted by fluorescence and MRI.> -wrap-foot> Age in years, M = male, F = female.
With the nulling of the cerebrospinal fluid (CSF), FLAIR imaging results in an excellent contrast between lesions in the white matter or grey matter and the surrounding brain tissue [ 1].
In BOLD imaging, on which most fMRI studies are based, the paramagnetic property of blood produces a bulk susceptibility difference between a blood vessel and the surrounding brain tissue, thus producing resonance frequency shifts in extravessel molecules.
The susceptibility-weighted imaging (SWI) sequence is a useful recent addition to this arsenal of MR imaging sequences; it has been designed to utilize the susceptibility difference between the deoxygenated blood in veins and the surrounding brain parenchyma to provide a high degree of contrast.
