An intriguing case of a paravertebral extramedullary erythropoiesis presenting as tumor‐mimicking lesion in a patient with eosinophilia with FIP1L1‐PDGFRA rearrangement

Abstract Extramedullary hematopoiesis in the posterior mediastinum is rare. Our case interested a 28‐year‐old man with a history of eosinophilia with FIP1L1‐PDGFRA fusion gene who had a mediastinal mass surgically excised. Pathological examination concluded to an extramedullary erythropoiesis. This case is original by its location and the presence of only the erythroblastic line rearrangement