A 41-year-old man with glucose-6-phosphate dehydrogenase deficiency who was a light smoker of 5 pack years and social drinker first presented in 2022 in Hong Kong with left hemiparesis, unsteady gait and headache, with Glasgow Coma Scale score of 13.Non-contrast axial computed tomography of the brain revealed a tumour at the foramen of Monro with hydrocephalus (Figure 1a).Mannitol was administered and urgent external ventricular shunting was performed to relieve the hydrocephalus.A well-defined solitary intraventricular tumour (Figure 1b-h) measuring 2 × 2.3 × 2.7 cm 3 was seen on subsequent magnetic resonance imaging (MRI), epicentred at the right lateral ventricle/ foramen of Monro.It was T1 iso-to hypointense, and T2 hyperintense with restricted diffusion and internal small foci of enhancement.There was no abnormal blooming artefact.The mass displaced the septum pellucidum to the left while the third ventricle was displaced to
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