Intramuscular lipoma - latissimus dorsi
Citation, DOI and case data
Right posterolateral thoracic wall painless mass sensation.
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Well-circumscribed, homogeneous high signal (T1/T2) mass measuring about 40*45*60 within the latissimus dorsi muscle on the right side that shows signal drop on fat suppression sequences
No evidence of thick septa, edematous changes, or local invasion.
MRI features are highly suggestive of benign type intramuscular lipoma
The main differential diagnosis is liposarcoma: usually with thick septa, enhancement, or evidence of local invasion.