Which lymph node characteristic on palpation suggests malignancy?

• A. Nodes that are small, mobile, and tender
• B. Nodes that are tender but less than 1 cm
• C. Nodes that are soft and freely movable
• D. Nodes larger than one centimeter, firm, fixed, or matted

Answer: (D)

When a lymph node is palpated, fixation and firmness with enlargement raise concern for malignancy. Nodes that are larger than 1 cm and are firm, fixed to underlying tissues, or matted together suggest possible cancer involvement because malignant cells infiltrate and connect through fibrous tissue, anchoring the nodes in place. In contrast, benign reactive nodes are usually small, soft, tender, and freely movable, and they often decrease in size with time or infection resolution. Tenderness points more toward infection or inflammatory processes rather than cancer, and a soft, movable node fits that benign pattern. So the hallmark sign of potential malignancy is a node that is enlarged beyond 1 cm and that is firm and fixed or matted. This finding warrants further evaluation with imaging and possibly biopsy based on the clinical context.