Which features are associated with malignant follicular lesions on ultrasound?

Which features are associated with malignant follicular lesions on ultrasound?

• A. Thin halo with complete angiographic regularity
• B. Thickened halo, irregular margins, chaotic arrangements of internal blood vessels
• C. Uniform echotexture with posterior enhancement
• D. Absent halo sign, micro calcifications, intranodular flow patterns

Answer: (B)

The main idea is that malignant follicular lesions tend to disrupt the capsule and show disorganized vascular growth. A thickened halo around the nodule suggests capsule irregularity or invasion, while irregular margins indicate the lesion is infiltrating surrounding tissue rather than staying well circumscribed. Chaotic internal blood vessel patterns reflect disorganized neovascularization that you often see with malignancy. Together, these features point to a higher risk of cancer in a follicular nodule. The other patterns are more typical of benign processes or less specific scenarios. A thin halo with regular, orderly vascularity usually corresponds to a benign lesion. A uniform echotexture with posterior enhancement is characteristic of a cyst or nonaggressive lesion. Absent halo with microcalcifications and intranodular flow can be seen in malignancies like papillary carcinoma, where microcalcifications are common, but this combination is less typical for malignant follicular lesions, where capsule irregularity and chaotic vascularity are more indicative.

The main idea is that malignant follicular lesions tend to disrupt the capsule and show disorganized vascular growth. A thickened halo around the nodule suggests capsule irregularity or invasion, while irregular margins indicate the lesion is infiltrating surrounding tissue rather than staying well circumscribed. Chaotic internal blood vessel patterns reflect disorganized neovascularization that you often see with malignancy. Together, these features point to a higher risk of cancer in a follicular nodule.

The other patterns are more typical of benign processes or less specific scenarios. A thin halo with regular, orderly vascularity usually corresponds to a benign lesion. A uniform echotexture with posterior enhancement is characteristic of a cyst or nonaggressive lesion. Absent halo with microcalcifications and intranodular flow can be seen in malignancies like papillary carcinoma, where microcalcifications are common, but this combination is less typical for malignant follicular lesions, where capsule irregularity and chaotic vascularity are more indicative.