47-year-old male with growing lesion behind left ear. There is a complex structure in the region of interest measuring 3.7 x 3.6 x 1.4 cm which is sonographically complex with cystic areas with septations as well as solid hypoechoic and hyperechoic regions.
Complex left postauricular lesion as described above has a wide differential and could represent a lesion such as a complex/sebaceous cyst or dermoid, but is best considered indeterminate. 