PMC3617977_01
Initial MRI revealed a faint high-intensity tumor on T1WI (a), T2WI (b) and DWI (c).
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F1
Magnetic resonance imaging (MRI) revealed a faint high-intensity tumor on T1-weighted imaging (T1WI), T2-weighted imaging (T2WI) and diffusion-weighted imaging (DWI) (fig. 1).
Repeat MRI performed 2 months later revealed a faint high-intensity tumor in T1WI (a) which was similar to that seen on previous MRI. However, T2WI (b) and DWI (c) showed a lesion with higher intensity than that seen 2 months prior.
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F2
T2WI and DWI showed a lesion with higher intensity than that seen 2 months prior (fig. 2).
Pathological examination of the tumor. Viable malignant cells were seen outside the fibrous capsule of the necrotic tumor. a Hematoxylin and eosin staining, x4. b Immunological staining using a monoclonal antibody against CD68, x4.
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F3
However, immunological staining using a monoclonal antibody against CD68 demonstrated a small amount of viable HCC cells outside the fibrous capsule of the necrotic tumor, although no viable cells were found inside the margins of the necrotic tumor tissue (fig. 3).