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[A Case of Arteritis That Developed after Pegfilgrastim Administration during Chemotherapy for Breast Cancer].

A 61-year-old woman presented with metastatic breast cancer in her right lung 4 years and 11 months after the operation for her right breast cancer(HER2 enriched type). Chemotherapy(pertuzumab plus trastuzumab plus docetaxel)were ad- ministered. On day 2 of cycle 2, pegfilgrastim was administered because her neutrophils decreased to 54 cells/mL on day 8 of cycle 1. On day 9 of cycle 2, she developed left neck and chest pain. Moreover, she developed a fever of 39°C on day 14 and visited our hospital. Her WBC and CRP increased to 18,300 cells/mL and 25.48mg/dL, respectively. Computed tomography revealed an increased CT value of the panniculus, around the aorta and left pleural effusion. Ultrasonography of the neck showed a marginal hypoechoic area around the left carotid artery, which corresponded with the pain. Arteritis induced by PFG was suspected. The neck pain and fever almost completely improved 19 days later, and cycle 3 was performed 28 days after cycle 2. To our knowledge, the present case is the second report of arteritis that was suspected to be associated with PFG.