New pulmonary lesions in an oncologic patient

A 44-year-old woman with a history of right elbow osteosarcoma underwent her routine follow-up chest CT scan. She had been treated with chemotherapy (cisplatin, epirubicin and ifosfamide) and her WBC count at the time of the examination was 3,500 / mcL. She was asymptomatic, erythrocyte sedimentation rate was normal and C-reactive protein was up to 2-fold increased. CT images and pathology slides are shown