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Anteroposterior and lateral digitally reconstructed radiographs depicting four patterns of failure: (A) within gross tumor volume (GTV)/planning target volume (PTV); (B) within GTV/PTV and extending outward; (C) within PTV but not GTV and extending outward (marginal miss); and (D) outside PTV (geographic miss). Red indicates recurrence; blue, GTV; and pink, PTV.
