PMC3318223_01
(a) Preoperative endoscopic image of the right-sided tumor situated at the posterior wall of the nasopharynx. (b) Endoscopic follow-up image of the nasopharynx 14 months after postoperative radiotherapy.
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Subsequent nasopharyngeal endoscopy revealed a right-sided mass, situated at the posterior wall of the nasopharynx (Figure 1(a)). There are still no signs of recurrence on follow-up endoscopy (Figure 1(b)) and MRI imaging, 14 months after radiotherapy.
CT (a) and MRI (b) imaging of the tumor (red arrows).
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High-resolution computed tomography (CT), as well as magnetic resonance imaging (MRI), showed a right-sided mass, measuring approximately 2 x 3 x 1.8 cm (Figure 2).
Histopathological images of the presented case. (a) Submucosal (surface epithelium in upper right) liposarcoma (H&E stain, x25) (b) Myxoid liposarcoma, with lipoblastic differentation (H&E x100) (c) Liposarcoma with round cells (H&E x100) (d) Mostly nuclear and some cytoplasmic immunoreactivity for S100 protein in the tumor cells (x100).
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Immunoperoxidase stains were positive for S100 protein, vimentin, CD68 in histiocytes, and Ki67 in less than 10% of tumor cells, being negative for SMA, NSE (Figure 3).