RESUMEN
BACKGROUND: Febrile neutropenia is generally recognised as a complication of myelosuppressive chemotherapy. Recombinant human granulocyte colony stimulating factor (G-CSF) is commonly used as a primary or secondary prophylaxis to reduce the degree and duration of neutropenia in patients at risk of developing chemotherapy-induced neutropenic fever and infectious complications. G-CSF is known to decrease mortality and increase the possibility of maintaining adequate chemotherapy dose intensity and density, which is essential in curable malignancies. Common side effects are generally mild. However, potentially fatal adverse events have also been reported. CASE PRESENTATION: Herein, we summarise previously reported and report two new independent cases of G-CSF-induced aortitis, both in patients treated with chemotherapy for breast cancer. The two cases, identified only a few months apart, share several common characteristics including type of cancer, gender, age, chemotherapy, G-CSF treatment regimen, and time span from G-CSF initiation to aortitis manifestation. The two cases were both diagnosed by CT scan and successfully treated with corticosteroids along with discontinuation of G-CSF. CONCLUSION: This case report highlights that although aortitis is a rare adverse event of G-CSF treatment, it should be considered in cases of unexplained fever and/or clinical and laboratory findings that do not respond to antibiotics.