case_images: PMC5312190_01
case_images: A) Nodule with dark blue homogeneous pigmentation,
  symmetrical and regular borders, measuring 2.5 cm in diameter on
  gluteus; B) Dermoscopy exhibited a homogeneous and
  structureless pigment pattern of grayish-brown color, more evident in
  the follicular ostia
case_images: abd-92-01-0110-gf01.jpg
case_images: PMC5312190_01_abd-92-01-0110-gf01.jpg
case_images: f1
case_images: Physical examination revealed a dark blue nodule with homogeneous pigmentation, symmetrical and regular borders, with 2.5 cm in diameter on the left gluteus, with no palpable lymph nodes (Figure 1A). Dermoscopy revealed a homogeneous and structureless pigment pattern of grayish-brown color, and a slightly irregular surface (Figure 1B).
case_images: Melanocyte proliferation occupying papillar and reticular dermis, and
  forming nests; no alteration in the epidermis was observed (Hematoxylin
  & eosin x40)
case_images: abd-92-01-0110-gf02.jpg
case_images: PMC5312190_01_abd-92-01-0110-gf02.jpg
case_images: f2
case_images: Histological examination revealed a solid melanocytic lesion, composed by hypercellular nests affecting the entire dermis and part of subcutaneous tissue (Figure 2).
case_images: Nests compose of heavily pigmented and dendritic melanocytes in the
  periphery; pale and ovoid melanocytes of intermediate size in the center
  were consistent with cellular blue nevus (Hematoxylin & eosin
  x100)
case_images: abd-92-01-0110-gf03.jpg
case_images: PMC5312190_01_abd-92-01-0110-gf03.jpg
case_images: f3
case_images: In the nest extremity, there were dendritic pigmented cells; in the center, ovoid and pale cells, with intermediate size; and focally, pleomorphic and vesicular nuclei, evident nucleoli, and occasional mitosis <2/mm2, which was compatible with ACBN (Figures 3 and 4).
case_images: Pleomorphic and vesicular nuclei, evident nucleoli, and occasional
  mitosis (<2/mm2) were compatible with atypical cellular
  blue nevus (Hematoxylin & eosin x400)
case_images: abd-92-01-0110-gf04.jpg
case_images: PMC5312190_01_abd-92-01-0110-gf04.jpg
case_images: f4
case_images: In the nest extremity, there were dendritic pigmented cells; in the center, ovoid and pale cells, with intermediate size; and focally, pleomorphic and vesicular nuclei, evident nucleoli, and occasional mitosis <2/mm2, which was compatible with ACBN (Figures 3 and 4).