What lesion contents appears hyperintense on T1 weighted image?
Methemoglobin (blood), melanin, lipid, protein, minerals, and contrast (Gd).
Intracranial lesion that bleeds?
Glioblastoma, pituitary adenoma, ependymoma, central neurocytoma, choroid plexus carcinoma, ganglioglioma, pilocytic astrocytoma, haemangiopericytoma, oligodendroglioma, pineocytoma, CNS germinoma, chordoma, Schwannoma, cavernous haemangioma, atypical teratoid/rhabdoid tumor, metastasis.
What are the cortical based tumors with cyst and nodule?
Common (ganglioglioma, metastases). Less common (Pilocytic astrocytoma, pleomorphic xanthoastrocytoma, glioblastoma). Rare (hemangioblastoma, Desmoplastic infantile astrocytoma, papillary glioneuronal tumor, schwannoma).
There is a cortical-based non-enhancing nodule measuring 2.9x2.0x1.5 cm in the right parietal region appearing isointense on T1 and mixed-signal on T2 weighted image with hypointense areas within (flow voids/calcification). The nodule is located eccentrically surrounded by a large well-defined area (hyperintense on T1W and mixed hyper-/hypointense on T2W) with hypointense rim on SWI s/o subacute hemorrhage. There is significant perilesional edema with mass effect as evidence by the effacement of the ipsilateral cortical sulci and lateral ventricle.