In this retrospective cohort study, the study sample consisted of 68 subsequent patients presented to our institution’s pathology department with bone marrow metastases of solid tumors from January 2006 to March 2010. We searched the patient files to detect which patients had undergone FDG-PET/CT analysis. PET/CT was found to have been ordered in 10 out of 68 patients (6.8%) for various purposes. These patients were included in the final analysis. The interval between the PET/CT examination and bone marrow biopsy was approximately 2 weeks. Seven of 10 patients were chemotherapy naive at the time of analysis whereas 3 patients had received chemotherapy. All patients gave informed consent about the PET/CT examinations and bone marrow biopsies. The detailed excerpts of the patients are as follows.