Must hemangiomas have abundant blood flow signals?

Most hemangiomas typically show abundant blood flow signals, but this is not always the case. Certain types or hemangiomas at specific stages may exhibit little or no significant blood flow signal. If there are concerns, it is advisable to seek medical consultation in advance. Detailed analysis is as follows:

Abundant blood flow signals are a typical feature of most hemangiomas, especially common types such as infantile hemangiomas and cavernous hemangiomas. These tumors consist of numerous abnormally proliferating blood vessels, forming a dense vascular network with active blood supply. On ultrasound imaging, they display prominent blood flow signals, which serve as one of the key radiological criteria for diagnosing hemangiomas and reflect the lesion's activity level.

Reduced or absent blood flow signals often occur in special types or hemangiomas at certain developmental stages. For example, small superficial micro-hemangiomas may have few blood vessels with narrow diameters and slow blood flow, showing only minimal or no detectable flow signals. Additionally, during the involution phase, abnormal blood vessels gradually undergo fibrosis and occlusion, leading to decreased blood supply; consequently, blood flow signals weaken or even disappear entirely. In such cases, diagnosis should be made by integrating these findings with other characteristics.

Diagnosis of hemangioma should not rely solely on blood flow signals but must incorporate comprehensive evaluation of morphology, lesion boundaries, and clinical symptoms. If atypical blood flow patterns are observed, further imaging studies should be performed to confirm the diagnosis.