Table 1: Demographic and tumor characteristics of 41 patients with primary retroperitoneal sarcoma who underwent surgical resection at Stanford Hospital from 1996 to 2007.

Variable % of total

Sex
Female1844
Male2356
Age
55 years1639
55 years2561
Duration of symptoms
6 months2561
6 months1127
Unkown512
Histological subtype
Liposarcoma2254
Leiomyosarcoma717
Malignant fibrous histiocytoma410
Other819
Tumor size (maximum diameter)
5 cm25
5–10 cm410
10–20 cm1844
20 cm1741
Tumor grade
Low1741
High2459