PMC6385516_01
Swelling over the scalp
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F1
On examination, the swelling was 2 cm in diameter and appeared to be soft, painless, and mobile [Figure 1].
Multiple myxoid nodules of variable sizes surrounded by the fibrous septa (a: H and E, x40). Round-to-oval spindle cells showing cytoplasmic projections in a myxoid background (b: H and E, x100)
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F2
Cytological atypia or mitosis was absent [Figure 2].
Myxoid substance positive for alcian blue at pH 2.5 ([a] x100, [b] x400)
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F3
The myxoid material in the tumor showed alcian blue positivity and periodic acid-Schiff stain negativity [Figures 3 and 4].
Myxoid substance negative for periodic acid-Schiff (x100)
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F4
The myxoid material in the tumor showed alcian blue positivity and periodic acid-Schiff stain negativity [Figures 3 and 4].
Tumor cells showing positivity for S-100 (DAB, x100)
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F5
The tumor cells showed S-100 positivity [Figure 5] and were negative for EMA [Figure 6] and CD-34 [Figure 7].
Tumor cells are negative for epithelial membrane antigen (DAB, x100)
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F6
The tumor cells showed S-100 positivity [Figure 5] and were negative for EMA [Figure 6] and CD-34 [Figure 7].
Tumor cells are negative for CD34 (DAB, x100)
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F7
The tumor cells showed S-100 positivity [Figure 5] and were negative for EMA [Figure 6] and CD-34 [Figure 7].