"Rosette-forming glioneuronal tumours are originally described in the region of the 4th ventricle (~60%) often with variable local parenchymal extension 3. A literature review 3 has demonstrated these tumours outside the characteristic location including the cerebellum hemispheres, cerebellopontine angle, pineal gland, midbrain tectum, thalamus, third ventricle, optic chiasm and spinal cord."
"It usually appears as a heterogeneous, circumscribed multicystic mass 7. Multiple satellite lesions may occasionally appear 7,8."
"DWI: no diffusion restriction"
"GFAP: positive"
"T1: hypointense signal on T1 WI"
"T2: hyperintense signal on T2 WI, haemorrhage or fluid levels may appear"
"MRS: mild Cho peak elevation, mild NAA peak reduction, an absent or uncommon lactate doublet"
"T1: hypointense signal on T1 WI"
"T2: hyperintense signal on T2 WI, haemorrhage or fluid levels may appear"
"T1 +C: may demonstrate septal and wall enhancement (giving a green bell pepper sign)"
"DWI: no diffusion restriction"
"MRS: mild Cho peak elevation, mild NAA peak reduction, an absent or uncommon lactate doublet"
Expected headings
"Microscopic features"
"Although relatively well-circumscribed on MRI and clinically indolent, they often invade surrounding tissues, involving the cerebellum, pons and even the pineal region. There are often cystic components and they tend to have heterogeneous contrast enhancement. They are considered WHO grade 1 tumours in the 2021 WHO classification of CNS tumours."
"T2: hyperintense signal on T2 WI, haemorrhage or fluid levels may appear"
"Although relatively well-circumscribed on MRI and clinically indolent, they often invade surrounding tissues, involving the cerebellum, pons and even the pineal region. There are often cystic components and they tend to have heterogeneous contrast enhancement. They are considered WHO grade 1 tumours in the 2021 WHO classification of CNS tumours."
"Rosette-forming glioneuronal tumours are originally described in the region of the 4th ventricle (~60%) often with variable local parenchymal extension 3. A literature review 3 has demonstrated these tumours outside the characteristic location including the cerebellum hemispheres, cerebellopontine angle, pineal gland, midbrain tectum, thalamus, third ventricle, optic chiasm and spinal cord."