The Diagnostic Performance of Magnetic Resonance Imaging in the Categorization of Pediatric Neck Lymph Nodes: Radiologic and Pathologic Correlations.

Abstract

To present MRI features of neck lymph nodes in benign and malignant conditions in the pediatric population. MRIs of the neck of 51 patients aged 1 to 18 years (40 boys, 11 girls [10.08±4.73]) with lymph node biopsy were retrospectively analyzed. Those were grouped as benign including reactive (27 [52.9%]) and lymphadenitis (11 [21.6%]), and malignant (13 [25.5%]). The groups were evaluated multiparametrically in terms of quantitative and qualitative variables. The long axis, short axis, area, and apparent diffusion coefficient (ADC) values of the largest lymph node were 21 (17 to 24)mm, 14 (12 to 18)mm, 228.60 (144.79 to 351.82)mm2, 2531 (2457 to 2714)mm2/s for reactive, 24 (19 to 27)mm, 15 (11 to 20)mm, 271.80 (231.43 to 412.20)mm2, 2534 (2425 to 2594)mm2/s for lymphadenitis, 27 (23.50 to 31.50)mm, 20 (15 to 22)mm, 377.08 (260.47 to 530.94)mm2, 2337 (2254 to 2466)mm2/s for malignant, respectively. Statistical analysis of our data suggests that the following parameters are associated with a higher likelihood of malignancy: long axis >22mm, short axis >16mm, area >319cm2, ADC value <2367mm2/s, and supraclavicular location. Perinodal and nodal heterogeneity, posterior cervical triangle location are common in lymphadenitis (P<0.001). Reactive lymph nodes are distributed symmetrically in both neck halves (P<0.001). In the MRI-based approach to lymph nodes, not only long axis, short axis, surface area, and ADC, but also location, distribution, perinodal, and nodal heterogeneity should be used.