Suebwong ChuthapisithWilairat PrasertMalee WarnnissornKanapon PradniwatVichien SrimuninnimitTamnit AngsusinhaMahidol University2018-06-112018-06-112012-07-01Oncology Letters. Vol.4, No.1 (2012), 67-7017921082179210742-s2.0-84861326700https://repository.li.mahidol.ac.th/handle/20.500.14594/13672Ewing's sarcoma/primitive neuroectodermal tumour (ES/PNET) is a rare tumour usually detected in young individuals and uncommonly found within the breast tissue. In this case report, we examined a 46-year-old patient, who developed a lump on her breast and was later diagnosed with ES/PNET. Clinical presentation, age at development and radiological findings were of interest and were discussed. Diagnosis of the tumour was confirmed using various immunohistochemical studies and the presence of a translocation, t(11;22). A literature review of this rare condition was also included.Mahidol UniversityBiochemistry, Genetics and Molecular BiologyMedicineArticleSCOPUS10.3892/ol.2012.698