PMC5625745_01
Macroscopic view of the smooth, reddish, and purulent tumor. No signs of infiltration are seen in the surrounding skin.
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fig1
Macroscopically the tumor was pediculated, had about 4 cm maximum diameter, and was attached to the right lumbar area with a 2 cm stem (Figure 1).
Histological examination of the tumor revealed mixed character of eccrine poroma and poroid hidradenoma (H&E x25).
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Tumor's architecture was lobular with areas of focal necroses and no signs of malignancy (Figure 2).
Immunostaining with ck-7 showed focal staining at eccrine poroma sites while areas of poroid hidradenoma were negative (ck-7 x25).
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fig3
Staining with K7 was focally positive at eccrine poroma sites while Ki-67 was <5% (Figure 3).