A 19-year-old male college student is struck on the right temple by a cricket ball. He loses consciousness briefly, then regains alertness and walks off the field (lucid interval). Over 90 minutes, he develops progressive headache, vomiting, and drowsiness. On arrival to the ED, his GCS is 7 with a fixed dilated right pupil and left hemiparesis. Non-contrast CT head is shown. The structure marked **A** in the diagram represents a hyperdense collection with a characteristic biconvex (lens-shaped) morphology. Which of the following best explains why this collection does NOT cross the coronal suture, despite significant mass effect?
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