Fig. 14
From: Understanding a mass in the paraspinal region: an anatomical approach
Intramuscular lipoma in the left erector spinae muscle in a 60-year-old male with soft, painless and non-inflammatory paraspinal tumefaction. MRI demonstrates the typical features of intramuscular lipoma: high intensity on T1WI (a), saturation on fat-saturated T1WI (b), high intensity onT2WI (c) and absence of enhancement on contrast-enhanced fat saturation T1WI (d). Streaky structures correspond to entrapped muscle fibres (arrows). US-guided biopsy (e, black arrowheads) shows a hyperechoic mass with thin transversal lines (white arrowheads). Pathological report demonstrates negative detection for MDM2 supporting classification as lipoma instead of atypical lipomatous tumour. The yellow star shows the epicentre of the mass