Figure 1
From: Primary extrahepatic alveolar echinococcosis of the lumbar spine and the psoas muscle
Computed tomography scans of the abdomen and pelvis. Non-enhanced (A) and contrast-enhanced (B) axial images show a multilobulated cystic mass in the right retroperitoneum, originating from the psoas muscle. Besides of the cystic components with fluid-like density (*) thickened septa with mild contrast enhancement (arrow) are seen. The coronal image (C) shows the extent of the mass along the psoas muscle. (D) The lumbar spine presents lytic lesions of the first and second lumbar vertebra (arrows) with partial cortical destruction.