What characteristic defines a lobulated lesion?

A lobulated lesion is characterized by bumpy or irregular borders that create a lobed or segmented appearance. This distinctive morphology can suggest specific types of pathology, as lobulated appearances are often associated with certain tumors or cysts that have developed distinct compartments or lobes due to abnormal growth patterns.

In contrast, smooth borders would indicate a more uniform or rounded lesion, often representing benign conditions. A fluid-filled appearance typically describes cysts that may have well-defined but smooth margins, rather than the irregularities found in lobulated lesions. Uniform echogenicity refers to an even texture or echo pattern throughout a lesion, which does not align with the irregularity suggested by the lobulated description. These other characteristics help in differentiating lobulated lesions from other types based on their presentations.