Clinical Epidemiology of Low-Grade and Dedifferentiated Osteosarcoma in Norway during 1975 and 2009

Table 2

Anatomical distribution of 54 patients with low-grade or dedifferentiated osteosarcoma (OS) combined. Separated between parosteal OS (POS), low-grade central OS (LGCOS), and other subgroups.

	POS (%)	LGCOS (%)	Other (%)	All patients (%)
Humerus	4 (20)	1 (3)		5 (9)
Femur	11 (55)	5 (17)		16 (30)
Tibia	4 (20)	5 (17)	1 (20)	10 (19)
Fibula		1 (3)		1 (2)
Mandible, maxilla		10 (34)	3 (60)	13 (24)
Costa, scapula, clavicle		3 (10)		3 (6)
Columna vertebralis		1 (3)		1 (2)
Pelvis, sacrum	1 (5)	2 (7)		3 (6)
Other		1 (3)	1 (20)	2 (4)
Total	20 (100)	29 (100)	5 (100)	54 (100)

Four cases of secondary low-grade OS and one case of extraskeletal low-grade OS (in the breast).