101. Enlarged perivascular spaces (PVS); Virchow Robin space, biomarker, anterior temporal

100. Glymphatic system part II; blood brain interface, perivascular, waste clearance, neuroimmune

99. Glymphatic system part I; CSF, cerebrospinal fluid, new concept, bulk flow, clearance pathway

98. Choroid plexus cyst; xanthogranuloma, CSF

97. Choroid plexus, CSF production; tela choroidea

96. Choroid plexus papilloma; DD atypical CPP, choroid plexus carcinoma, intraventricular tumor

95. Ependymoma; ventricular tumor, plastic tumor, PF-EPN, ST-EPN, radial glial cells

94. Subependymoma; ventricular tumor, fourth ventricle, lateral ventricles, aquaporines

93. Central neurocytoma and septum pellucidum; intraventricular tumor, septum and frontal horns

92. Intraventricular meningeoma; intraventricular tumor, trigone, embryology roof plate

91. Meningioma; extra-axial tumor, brain tumor (misnomer), neurofibromatosis type 2, NF2

90. Arachnoid cyst; arachnoidal cyst, brain cyst (misnomer), meningeal cyst, incidental finding

89. Embryology of the meninges; endomeninx, ectomeninx, mesoderm, neural crest, SLYM

88. Epidermoid cyst; cerebellopontine angle, inclusion cyst, posterior fossa, restricted diffusion

87. Dermoid cyst; inclusion cyst, fatty midline mass, dermal sinus tract, chemical meningitis

86. Teratoma; nongerminomatous germ cell tumor, calcified and fatty midline mass; pineal, pituitary

85. Germ cell tumors of the CNS; germinoma, teratoma, choriocarcinoma, stem cells, pineal, pituitary

84. Craniopharyngioma; adamantinous, papillary craniopharyngioma, sellar, suprasellar, endocrinology

83. Rathke's cleft cyst; sellar, suprasellar, Rathke's pouch, intracystic nodule, pituitary

82. Pituitary macroadenoma; prolactinoma, pituitary apoplexy, chiasm compression, cavernous sinus

81. Microadenoma; anterior pituitary, adenohypophysis, dynamic MRI, hormones, prolactinoma

80. Posterior pituitary bright spot; ectopic neurohypophysis, oxytocin, vasopressin, endocrinology

79. Hypothalamic hamartoma, tuber cinereum hamartoma; gelastic seizures, ciliopathy, SHH, endocrine

78. Deep structures of the forebrain, embryology: thalamus, hypothalamus, striate, hippocampus

77. Thalamus in epilepsy, deep brain stimulation; thalamic nuclei, focal -tonic clonic seizures, DBS

76. Psychogenic non-epileptic seizure, PNES; pseudoepilepsy, DSM5 diagnosis, kindling, mind, mental

74. Postictal imaging changes; excitotoxic edema, hyperperfusion, BBB disruption, seizure related

75. Status epilepticus; SE, peri-ictal MR abnormalities, PMA, hippocampus, pulvinar, epilepsy

73. Ischemic stroke, brain infarct; core, penumbra, thrombolysis, CT perfusion, CBF CBV

72. Hemorrhagic stroke; hypertensive haemorrhage, lobar haemorrhage, swirl, black hole, spot sign

71. (Aspecific) white matter hyperintensities, chronic hypertensive encephalopathy; "white dots"

70. CADASIL; Notch3, arteriopathy, pericyt, blood brain barrier, anterior temporal pole, stroke

69. I-CAA and ABRA; CAA related inflammation, amyloid beta related angiitis, encephalopathy, elderly

68. CAA, Cerebral Amyloid (micro) Angiopathy; vascular dementia, micro bleeds, superficial siderosis

67. Radiation induced cavernoma and mineralising microangiopathy; popcorn, capillary teleangiectasia

66. Radiation necrosis; swiss cheese, DWI, perfusion, glioma treatment

65. Pseudoprogression and pseudoresponse; post treatment glioma MRI, RANO, Stupp, Bevacizumab, rCBV

64. CT perfusion and MR perfusion; cerebral blood flow, cerebral blood volume, DCE, DSC

63. Oligodendroglioma; 1p19q codeleted, IDHmutant, cortical-subcortical mass, oligoastrocytoma

62. Glioblastoma versus astrocytoma IDH-mutant grade 4; GBM, prognosis different, TME immunotherapy

61. Astrocytoma IDH-mutant grade 2 & 3; diffuse & anaplastic astrocytoma, IDH oncometabolite

60. Pilocytic astrocytoma; brain tumor, paediatric, astrocyte, GFAP, optic glioma, NF1, pilomyxoid

59. Glial tumors - introduction/overview; primary brain tumor, glioma, WHO classification 2021

58. FASIs (a.k.a. UBOs) in neurofibromatosis type 1; brain MRI, neurofibromin, OMG

57. Hepatic encephalopathy; hepatocerebral, hyperammonia, cingulate insula, manganese, basal ganglia

56. Hypoglycemic encephalopathy; low glucose, thalamic sparing, insulin shock therapy

55. Creutzfeldt-Jakob disease; mad cow bovine spongiform encephalopathy, prion, progressive dementia

54. Wilson disease; copper metabolism, hepatolenticular degeneration, panda sign, striate, GABA

53. Leigh syndrome; mitochondrial. DD acute necrotising encephalitis (ANE), Japanese encephalitis

52. Canavan disease; leukodystrophy, Ashkenazi Jewish carrier, NAA, neuron-glial cell communication

51. MR spectroscopy in clinical practice; choline, creatine, NAA, chemical shift, metabolites, MRS

50. Krabbe disease, globoid cell leukodystrophy; myelin, GalCer, metabolic, genetic

49. Metachromatic leukodystrophy; MLD, arylsulfatase A deficiency, lysosomal, tigroid pattern

48. X-linked Adrenoleukodystrophy; X-ALD, metabolic peroxisomal, very long chain fatty acids (VLCFA)

47. Leukodystrophy - introduction/overview; metabolic, genetic, MRI white matter patterns

46. PRES - Posterior Reversible Encephalopathy Syndrome; acute hypertensive, vasogenic edema

45. Osmotic demyelination syndrome; ODS, pontine myelinolysis, hyponatriemia correction, piglet sign

44. Hyponatriemia and brain edema; aquaporines, SIADH, metabolic, electrolytes

43. MERS, CLOCC; mild encephalitis with reversible splenial lesion, cytotoxic edema corpus callosum

42. Acute hemorrhagic leukencephalitis; AHLE, AHEM, micro bleeds, encephalomyelitis, SWI gradient