A 29-year-old man had a mass measuring about 2.1 cm × 2.0 cm × 1.6 cm by CT scan for three years. He was hospitalized with a primary diagnosis of backache. CT scan demonstrated a lobular,low attenuating mass, measuring about 5.2 cm× 4.4 cm × 3.3 cm (Fig. 1). The mass was homogeneously hypointense on T1-weighted images and heterogeneously hypefintense on T2-weighted images (Fig. 2).
