Which characteristics of a solitary pulmonary nodule are most suggestive of malignancy?

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Multiple Choice

Which characteristics of a solitary pulmonary nodule are most suggestive of malignancy?

Malignant solitary pulmonary nodules tend to grow with irregular, spiculated margins because tumor cells invade beyond the capsule into surrounding lung tissue, pulling strands of tissue outward and creating radiating lines. That irregular shape with spiky borders is a radiographic sign of invasive growth and is one of the strongest clues pointing toward cancer. In contrast, smooth, well-circumscribed borders usually reflect benign processes that don’t infiltrate the surrounding parenchyma; calcified centers with popcorn calcification are classic for benign hamartomas; uniform density and margin also suggest a noninvasive, nonaggressive lesion. Therefore, the irregular shape with spiculated margins best signals malignancy.

Malignant solitary pulmonary nodules tend to grow with irregular, spiculated margins because tumor cells invade beyond the capsule into surrounding lung tissue, pulling strands of tissue outward and creating radiating lines. That irregular shape with spiky borders is a radiographic sign of invasive growth and is one of the strongest clues pointing toward cancer.

In contrast, smooth, well-circumscribed borders usually reflect benign processes that don’t infiltrate the surrounding parenchyma; calcified centers with popcorn calcification are classic for benign hamartomas; uniform density and margin also suggest a noninvasive, nonaggressive lesion. Therefore, the irregular shape with spiculated margins best signals malignancy.

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