Thrombotic thrombocytopenic purpura, although atypical among colorectal cancer, should not be overlooked as a possible indicator of advanced disease with bone marrow metastasis.

• 栓塞性血小板减少紫斑症即使不是结肠直肠癌症的典型表徵，亦不应被忽视作为可能是晚期大结肠直肠癌的表徵。