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Fig. 5 65-year-old man presenting with left-sided mixed (i.e., motor
and sensory) brachial plexopathy of 2 months' duration. Patient also has
history of cigarette smoking and persistent cough that developed 3 weeks
earlier. Chest radiography (not shown) revealed abnormal findings. Coronal
T1-weighted image shows large left tumor (arrow); note normal
interscalene fat pad on right. Obliteration of this fat by tumor as seen here
generally implies invasion of brachial plexus at level of trunks that normally
course between scalene muscles in interscalene fat pad.