Figure 1. Typical ultrasonographic images of lipoma (A), epidermal cyst (B), and ganglion (C). A, An elongated isoechoic mass is evident in the subcutaneous tissue. There are striated echoes in the mass (arrow). B, A round to oval nonanechoic mass with a partial indentation to the dermis, dorsal acoustic amplification, and lateral shadows. C, An anechoic amorphous mass with a relatively sharp border and protrusion toward the joint (arrow). Arrowheads indicate masses.