has part has part characteristic of part of inheres in part of has modifier Edema Abnormal cerebral morphology Cerebral edema Brain oedema SNOMEDCT_US:2032001 Cerebral oedema Cerebral edema refers to swelling within brain tissue due to the accumulation of fluid, and can occur as in response to almost any insulting agent. Edema canbe observed in and around regions of dead or dying brain, around metastases and abscesses, after traumatic injury, following hypoxic ischemic injury, and around primary brain tumors. There are at least five different types of edema: vasogenic, cytotoxic, hydrostatic, interstitial, and hypoosmotic. Three effects of edema are visible on imaging: (i) loss of gray-white matter differentiation; (ii) swelling of sulci (shrinking of gyri); and (iii) mass effects. On CT scanning, extensive low density may represent vasogenic edema. As the brain swells, not only do the sulci decrease, but all of the CSF spaces of the hemispheres (including the ventricles) decrease as well. Magnetic resonance tomography may show abnormalities of diffusion-weighted imaging (DWI), and Fluid attenuation inversion recovery (FLAIR) sequences. Phenotype terms involving cerebral edema thus reflect inference about the underlying processes responsible for these abnormalities on brain imaging. HP:0002181 UMLS:C0006114 Brain edema Brain swelling Abnormal accumulation of fluid in the brain. Swelling of brain UMLS:C1527311 abnormal edematous telencephalon