A 74-year-old man with chronic alcohol use and a minor fall 4 weeks ago presents with progressive headache, gait unsteadiness, and mild confusion. On examination, he has a GCS of 14 with subtle left-sided pronator drift. Non-contrast CT head shows a crescentic extra-axial collection over the right cerebral convexity. The structure marked **A** in the diagram is isodense to adjacent cortex and effaces the cortical sulci. Which of the following best explains why this isodense collection is easily missed on CT imaging?
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