Figure 17b.

Pathologically proven, painless, palpable, epidermoid inclusion cyst at the anterior aspect of the proximal tibia in an 18-year-old woman. (a) Long-axis gray-scale US image in the region of palpable abnormality shows a homogeneously hypoechoic circumscribed oval subcutaneous mass (arrow) with increased through transmission. (b) Color elastogram of the same region shows low shear-wave velocities (mean, 2.76 m/sec) within the mass (arrows). SWE data were collected using an Acuson S3000 US scanner with an L9–4-MHz linear transducer.