As the hematoma ages, the collection becomes lower in density. Can enlarge rapidly and thus considered surgical emergencies. The dura is tightly adherent to the skull, so blood collecting between the calvarium and dura is usually under pressure. Usually biconvex or lentiform in shape. High density collection on unenhanced CT scan.
Contrast enhancement is usually unimpressive.
Indistinct margins and deep location usually characterizes low grade gliomas. May present with clinical and imaging features of a stroke Metastatic Disease May be difficult to differentiate from abscess, primary neoplasm or stroke Lung carcinoma, melanoma, breast, testis, and colon cancer can metastasize to brain. Multiple Sclerosis MR is the procedure of choice to detect the plaques of multiple sclerosis Small, sharply defined areas of high signal intensity on T2- weighted images are seen in the periventricular region. On CT, will be low density on unenhanced images and may enhance with contrast. Can confuse with stroke, abscess, neoplasm.