case_images: PMC5705882_01
case_images: Abdominal CTA showing a lobulated low-density soft tissue mass within the retroperitoneum with involvement of the bilateral psoas muscles.
case_images: CRIPA2017-4076159.001.jpg
case_images: PMC5705882_01_CRIPA2017-4076159.001.jpg
case_images: fig1
case_images: Abdominal computed tomography angiography (CTA) showed a retroperitoneal 13.1 x 10 x 5 cm hypodense mass lesion at the L3-L5 level, extending to the bilateral psoas muscles (Figure 1).
case_images: Fine needle aspiration revealed benign skeletal muscle, fibrous tissue, and few fragments of necrotic material.
case_images: CRIPA2017-4076159.002.jpg
case_images: PMC5705882_01_CRIPA2017-4076159.002.jpg
case_images: fig2
case_images: CT-guided core biopsy was performed to evaluate the retroperitoneal mass, which revealed ischemic necrosis involving skeletal muscle and fibro connective tissue (Figure 2).