A 70-year-old female presents with a 3-month history of headache and 1 month of visual acuity decline. She also reports low-grade fever, fatigue, and generalized flu-like symptoms. No history of hypertension (HTN). Physical exam reveals a palpable nodule in the temporal region with marked tenderness and weakened pulsation over the left temporal artery. Head CT shows no abnormalities. The typical pathological finding of this condition is: