Utility of diffusion-weighted imaging in the diagnosis of inguinal lymph node metastasis with malignant melanoma

Figure 1 Axial T1 weighted image (A), T2 weighted image (B) and contrast enhanced fat saturated T1 image (C) showing contrast enhancing inguinal conglomerated lymph node enlargement (arrows).

Figure 2 Diffusion weighted images b800 (A) and apparent diffusion coefficient map (B) showing diffusion restriction in inguinal conglomerated lymph nodes (arrows).

Figure 3 Pathological examination. A: Photomicrograph of metastatic malignant melanoma in the inguinal lymph node (HE, × 50). The bottom right corner HE, ×100; B: Immunohistochemical study shows that the spindle cells are positive for HMB-45.