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FIGURE 1 The huge mass on the right back neck of the patient.
FIGURE 2 Neck MRI plain scan and enhancement showing: Massive soft tissue occupying the shadow in the right back neck; mixed weak signal on the T1 enhanced image; large flaky liquefied necrosis area in the center of the lesion; the largest area of the lesion was approximately 64mm×65mm×89mm; adjacent soft tissues were pushed and displaced. The focus of the enhanced scan showed rosette enhancement (A-C). T2WI image of neck MRI showing a large sheet of liquefied necrosis in the center of the mass of soft tissue lesion at the right back neck, with liquid-liquid flat shadow (D).
FIGURE 3 H&E staining showing that oval cells with eosinophilic cytoplasm are morphologically consistent with rhabdoid differentiation identified in the background of malignant peripheral nerve sheath tumor (A). Immumohistochemical staining showing that the tumor cells are diffusely positive for S-100 (B), desmin (C), and myogenin (D).