Fig. 2.

A : A 61-year-old man underwent imaging 2 hours following onset of left-sided paralysis. NCCT demonstrates a right basal ganglia ICH (34 mL) with associated IVH (19 mL). B : Axial CTA source image in spot windows demonstrates 1 foci of contrast pooling within the ICH with an attenuation 176 HU (arrowheads), consistent with spot signs (a total of 4 spot signs were identified). The largest spot sign measured 5.7 mm in maximum axial dimension and had an attenuation of 245 HU (spot sign score, 4). C : Axial CTA image shows that the spot sign looks like aneurysmal sac. D : Non-contrast CT 4 hours after the baseline CTA demonstrates marked interval expansion of both the ICH (86 mL) and IVH (42 mL). E : Conventional angiographic image demonstrates absence of aneurysmal sac. NCCT : noncontrast CT, ICH : intracerebral hemorrhage, IVH : intraventricular hemorrhage, CTA : CT angiography, HU : Hounsfield units.