Fig. 3
A 6-year-old female patient complaining of headache. Axial T1 (a), axial T2 (b), axial FLAIR (c), coronal T1 post-contrast (d), sagittal T1 post-contrast (e)—a mixed cystic and solid SOL seen at posterior fossa involving cerebellar vermis and left cerebellar hemisphere measured 55 × 58 × 53 mm at its AP, width, and CC dimensions exerting mass effect inform of compressing 4th ventricle, the lesion mainly cystic displayed CSF signal intensity, solid nodule displayed low signal intensity at T1WI (a), high signal intensity at T2 (b), and FLAIR sequence (c) with mild contrast uptake (d), (e) seen only in the solid mural component. Axial DWI (f), axial ADC map (g)—the lesion showed free diffusion, ADC value of the lesion (1.490, 1.500, 1.570) × 10−3 mm2/s, average (1.500 × 10−3), ADC value of the normal cerebellum—(0.742, 0.743, 0.749) × 10−3 mm2/s, average 0.743 × 10−3 mm2/s, ADC ratio—2.3 that are consistent with cerebellar pilocytic astrocytoma confirmed by histopathology