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Figure 2: (a) An example of a syringocystadenoma papilliferum found in a dermatopathology reference file mislabeled as hidradenoma papilliferum. This lesion was from the perineum of a 49-year-old female. The lesion was asymptomatic. Note the bulbous shape of the papillae and their abundant stroma in contrast to the thin stromas of the hidradenoma papilliferum seen in Figures 1a and b. Note the apocrine secretion and the denser appearance of the cells than in Figures 1a and b. Note also the absence of an inflammatory infiltrate in the stroma of these papillae (H and E, ×60). (b) Same case as in Figure 2a, high-power view. Again note the absence of an inflammatory infiltrate within the papilla shown (H and E, ×240). (c) An example of a syringocystadeoma papilliferum occurring in a nevus sebaceous of Jadassohn. Note the intense infiltrate of plasma cells in the papilla shown (H and E, ×120)

Figure 2: (a) An example of a syringocystadenoma papilliferum found in a dermatopathology reference file mislabeled as hidradenoma papilliferum. This lesion was from the perineum of a 49-year-old female. The lesion was asymptomatic. Note the bulbous shape of the papillae and their abundant stroma in contrast to the thin stromas of the hidradenoma papilliferum seen in Figures 1a and b. Note the apocrine secretion and the denser appearance of the cells than in Figures 1a and b. Note also the absence of an inflammatory infiltrate in the stroma of these papillae (H and E, ×60). (b) Same case as in Figure 2a, high-power view. Again note the absence of an inflammatory infiltrate within the papilla shown (H and E, ×240). (c) An example of a syringocystadeoma papilliferum occurring in a nevus sebaceous of Jadassohn. Note the intense infiltrate of plasma cells in the papilla shown (H and E, ×120)