57-year-old female with lump in the posterior knee. Grayscale and color ultrasound examination of the left posterior popliteal region demonstrates a circumscribed solid lesion measuring 3.5 x 2.0 x 3.5 cm with internal linear regions of increased echogenicity and no significant vascularity.
Sonographic findings as described above are most suggestive of a lipoma. Cross-sectional imaging may be performed for further evaluation if warranted clinically.