Accidental transplantation of tumour cells.
D000328:Adult; D001932:Brain Neoplasms / Q000473:pathology; D006801:Humans; D008297:Male; D009362:Neoplasm Metastasis / Q000175:diagnosis; D009369:Neoplasms / Q000635:transmission*; D014184:Transplantation, Homologous / Q000009:adverse effects*