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A 78-year-old woman with an example of a physiologically occult aneurysm on the initial DSA on the postbleed day 1. A frontal projection (A) with 3D reconstruction shows no source lesion (B). A second DSA on postbleed day 6 had normal findings. The patient was discharged and re-presented with worsening headache on postbleed day 12. A third DSA on postbleed day 12 (C) demonstrated a submillimeter basilar artery perforator blister aneurysm (curved white arrow) that was clipped.
