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Of 765 patients with disseminated metastatic carcinoma of the colon and rectum treated at Memorial Sloan-Kettering Cancer Center during the ten-year period 1960--1970, 53 (6.9 per cent) had skeletal metastases. Of these, 14 (1.8 per cent) had osseous metastases only. In one case the osseous lesion was the first symptom of a cancer of the sigmoid colon, and one patient had metastasis in the fibula from a primary rectal cancer. In our series the incidences of osseous metastases were 8.9 per cent from rectal carcinoma and 5.1 per cent from colonic carcinoma. The mean period from manifestation of skeletal metastasis to death was 13.2 months.