Traumatic stump neuroma.
A, Axial T1-weighted spin-echo image (600/9/2), obtained through the right distal thigh (stump), reveals a low signal intensity mass (arrow) within the distal sciatic nerve.
B, Axial T1-weighted spin-echo contrast-enhanced fat-saturated image (550/14/2) shows mild enhancement of the mass (arrow).
C, Axial T2-weighted fast spin-echo fat-saturated image (5000/90/2; echo train length, 8), obtained proximal to the mass, shows sciatic nerve enlargement with focal swollen T2-weighted hyperintense fascicles (arrows).
D, Coronal T2-weighted fast spin-echo fat-saturated image (5000/102/2; echo train length, 8) confirms diffuse sciatic nerve enlargement and abnormal T2 hyperintensity (arrows) proximal to the mass. Final surgical pathologic analysis revealed traumatic neuroma.