Cyst characteristics and location distinguish epidermoid and dermoid tumors. Epidermoid tumors usually are located on the side of the brain or skull, while dermoid tumors are located closer to the brain's midline. The cysts of dermoid tumors include other dermal components, such as the material that makes up hair, teeth, and skin glands, while epidermoid tumors do not. Fifty percent of those with dermoid tumors will have other congenital abnormalities, while those with epidermoid tumors do not. These tumors can occur in a variety of locations, including the spine, skull, scalp, and inside the brain (intracranially)
T1W MRI - High signal - Dermoid
CT AND MRI of epidermoid - CT shows hypodense mass. MRI shows t2 hyperintense mass.
Epidermoid tumors are solid masses, however, which demonstrate ADCs similar to those of gray matter and lower than those of CSF . With the combination of T2 and diffusion effects, epidermoid tumors are markedly hyperintense compared with CSF and brain tissue on diffusion MR images.
T1W MRI - High signal - DermoidCT AND MRI of epidermoid - CT shows hypodense mass. MRI shows t2 hyperintense mass.
Epidermoid tumors are solid masses, however, which demonstrate ADCs similar to those of gray matter and lower than those of CSF . With the combination of T2 and diffusion effects, epidermoid tumors are markedly hyperintense compared with CSF and brain tissue on diffusion MR images.
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