Figure 1: (A) Schematic coronal section of the brain showing large (supratentorial) right subdural hematoma causing ipsilateral transtentorial herniation, which has resulted in compression of the contralateral cerebral peduncle (broken, red arrow). This led to ipsilateral (right-sided) weakness. (B) Schematic coronal section of the brain showing (infratentorial) right meningioma (M) causing upward and leftward displacement of the midbrain and cerebral peduncles, which has resulted in compression of the left cerebral peduncle and corticospinal tracts against the tentorium cerebelli (open arrow), which contributed to the ipsilateral (right-side) weakness. In both figures, the solid arrows indicate the direction of shift due to the mass effect, either from the subdural hematoma or from the tumour.