Ultra-early response assessment in lymphoma treatment: [<sup>18</sup>F]FDG PET/MR captures changes in glucose metabolism and cell density within the first 72 hours of treatment.

Significant changes in morphological lesion volumes were also observed at these early time-points, although they were only small-to-moderate, particularly during the first 48–72 h after treatment initiation, when, contrary to changes after 1 week, they did not reach statistical significance.

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