PMC9678681_01
CT imaging. An axial image of plain CT scan shows a mass (white arrow) 1.6 cm in diameter with high-density compared with the brain parenchyma in the anterior horn of the left lateral ventricle.
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Computed tomography (CT) of the head was performed, and a mass 1.6cm in diameter was incidentally detected in the anterior horn of the left lateral ventricle (Fig. 1).
MR imaging. Axial MR images (A-E) reveal that the mass (white arrow) shows an iso-signal intensity compared to the cortex on T1- and T2-weighted images (A, B), high signal intensity on the diffusion-weighted image at b = 1000 s mm-2 (C), and low ADC values (D). Gadolinium-based contrast enhanced T1-weighted image (E) shows a faint enhancement. T2-weighted coronal images (F-K) show the tumor (T) arising from the left fornix and the atrophy of the ipsilateral fornix (F) and the mammillary body (M). Coronal image of high resolution CISS MR acquisition (L) presents more clearly.
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The mass showed iso-signal intensity compared to the cortex on T1- and T2-weighted MR imaging (Fig. 2A & B), high signal intensity on diffusion-weighted imaging at b = 1000 s mm-2 (Fig. 2C), and low ADC values (Fig. 2D). Gadolinium-based contrast enhanced T1-weighted imaging (Fig. 2E) revealed slight enhancement. Coronal MR images (Fig. 2F-L) showed that the mass was arising from the left fornix and the ipsilateral fornix and mammillary body were smaller in size.
Endoscopic view of the left lateral ventricle. A mass arising from the left fornix was soft and prone to bleeding.
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Intraventricular endoscopy revealed a mass arising from the left fornix, which was soft and easy to bleeding (Fig. 3).
Histopathology of the biopsy sample. Hematoxylin and eosin stained specimens (A: 20x, B: 200x) show the tumor comprises round to polygonal cells with large nuclei and tumor-infiltrating lymphocytes.
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Histopathological examination revealed the tumor was composed of round to polygonal cells with large nuclei and tumor-infiltrating lymphocytes (Fig. 4A & B).