Clinical Characteristics and Prognostic Analysis of Multiple Myeloma with Extramedullary Disease: A SEER-Based Study

Table 2

Distribution of the study population according to extramedullary sites.

	Extramedullary sites	Number	Percentage (%)
Total		155	100
EMD-B		99	63.90
	Appendicular skeleton	17	10.97
	Long bones of upper limb, scapula, and associated joints	8	5.16
	Short bones of upper limb and associated joints	1	0.65
	Long bones of lower limb and associated joints	8	5.16
	Axial skeleton	82	52.90
	Bones of skull and face and associated joints	7	4.52
	Mandible	1	0.65
	Rib, sternum, clavicle, and associated joints	19	12.26
Spine	Vertebral column	25	16.13
	Pelvic bones, sacrum, coccyx, and associated joints	13	8.39
	Other unspecified sites	17	10.97
EMD-S		56	36.10
	Head and neck	9	5.81
	Lung	10	6.45
	Liver and pancreas	7	4.52
	Gastrointestinal tract	7	4.52
	Retroperitoneum	2	1.29
	Skin, connective, subcutaneous, and soft tissue	18	11.61
	Other organs	3	1.94