A patient with hereditary spherocytosis was admitted with mediastinal masses on the chest X-ray. 52Fe and positron emission tomography (PET) showed uptake of 52Fe in the masses and established the diagnosis of thoracic extramedullary hematopoiesis.
Borgies, P., Ferrant, A., Leners, N., Michaux, J.-L., Bol, A., Michel, C., Cogneau, M., & Sokal, G. (1989). Diagnosis of heterotopic bone marrow in the mediastinum using 52Fe and positron emission tomography. European journal of nuclear medicine, 15(11), 761-763. https://doi.org/10.1007/BF00631772 (Original work published 1989)