Fig. 3
From: Understanding a mass in the paraspinal region: an anatomical approach
Liposarcoma of the left lumbar paraspinal muscles in a 57-year-old male with a bump in the back and mild left iliac fossa pain. Contrast-enhanced axial CT scan reconstruction (a) and axial T1WI (b) show intramuscular lipomatous tumour invading both the hypaxial and epaxial muscles. Fat content (white stars) presents low attenuation on CT, high signal on T1WI and saturates on fat-saturated T1WI (c). The mass demonstrates a bilobed shape with an epicentre located between the epaxial and hypaxial regions (yellow stars). Axial contrast-enhanced fat-saturated T1WI (c) shows muscle and fascia enhancement (arrows), a key driving feature for liposarcoma. Digital subtraction angiogram (d) of the left 2nd lumbar artery (arrow) shows hypervascularisation of the tumour (arrowheads). After embolisation (e), hypervascularisation decreased (arrowheads)