My father s histopathology (medium biopsy specimen, tissue/parafin block)results last week diagnosed the following .He had shooting pain in back & legs.Clinical diagnosis
Extradural mass at D12-L1 vertebra level means, Spinal cord is covered by aura, Pia and arachnoid covering and mass at this point is absolutely correctly given by histopatho report of biopsy(extra myeloid granulocyte sarcoma??, lymphoplasmacytic lymphoma?, plasmacytoma?)  So but all together cancer treatment is firmly based on final diagnosis you can't treat all three differential diagnosis, so you have to finally conclude one of them by a special test so called Immunohistochemistry which is a currently available weapon to diagnosis of cancer beside H&E Stained biopsy report, Once IOC has given report of biopsy, majority time we have to believe it's finding of it and start treatment as per its report. If its lymphoma then treatment is chemotherapy followed by radiotherapy to local site, if its sarcoma treatment is chemo, if it turns plasmacytoma then radiotherapy after skeletal survey of whole body to rule out possibility of multiple myeloma.