It is interesting to note that primary malignant tumours of the bones, account for only 2 percent of the patients. Amongst them involvement of the foot is seen less than 2 percent of malignant bone tumours, hence rare amidst rarity. Apart from the usual histogenetic classification, as mentioned in the previous chapter, Plasmacytoma/multiple myeloma and Unknown histogenesis are additional categories. Radiological features of malignancy in general have been described. Typical features of Osteosarcoma, Chondrosarcoma and fibrosarcoma are described. Ewing’s sarcoma, a tumour of unknown histogenesis and synovial sarcoma can occur in the foot. In all the above mentioned tumours, usual sites are calcaneus and metatarsals. Plasmacytoma and multiple myeloma when present show the classical features of osteopenia and small lytic lesions. Metastatic disease can involve bones of the feet, though rare. Common primary malignancies metastasizing to bones of the foot are, carcinoma lung and prostate in males and breast and cervix in females.