“No Significant Lymphadenopathy” on Imaging: Meaning & Reassurance

Definition

The phrase “no significant lymphadenopathy” (or “significant lymphadenopathy not appreciated”) in a radiology report means no lymph nodes meet criteria for pathologic enlargement based on size, shape, or morphology for the imaged region.

Size Thresholds (CT/MRI)

• Neck: short axis >10 mm (or >8 mm for jugulodigastric).
• Axilla: >10–15 mm.
• Mediastinum: >10 mm (station-dependent).
• Abdomen/Pelvis: >10 mm short axis (mesenteric >5 mm).
• Inguinal: >10–15 mm (can be normal up to 15–20 mm in adults).

Morphologic Features of Concern

• Round shape (loss of fatty hilum).
• Heterogeneous enhancement / necrosis.
• Clustering / matting.
• Extranodal extension.

Clinical Implication

Reassuring finding; reduces suspicion for metastatic disease, lymphoma, or active granulomatous infection. Does not exclude microscopic involvement. Clinical correlation always required—if high pre-test suspicion, consider PET/CT or biopsy despite negative size criteria.