What sonographic features characterize a hemangioma?

A hemangioma is typically characterized on ultrasound by being a well-defined, homogeneous echogenic mass. This means that it appears as a clear and distinct mass that is uniformly bright or echogenic, indicating that it is filled with blood vessels. The potential presence of a hypoechoic halo around the mass can be observed in some cases, which often reflects the surrounding tissue reaction or edema. This characteristic appearance helps distinguish a hemangioma from other types of lesions, which may have irregular borders, mixed echogenicities, or other features not typical of hemangiomas.

Other descriptions, such as an irregular mass with mixed echogenicity, do not apply to hemangiomas as they would suggest more complex or malignant processes. Cystic structures with thick walls and small heterogeneous masses with shadowing also represent different pathologies and do not align with the classic appearance of a hemangioma. Overall, the well-defined, homogeneous echogenic nature of a hemangioma is a key sonographic feature that aids in its identification.