Cutaneous Neurocristic Hamartoma Presenting as Cutis Verticis GyrataSaha, Debarshi MD*; Kini, Ullal Anand MS, MCh†; Kini, Hema MD*The American Journal of Dermatopathology: March 2014 - Volume 36 - Issue 3 - p e66–e69 doi: 10.1097/DAD.0b013e3182919c76 Extraordinary Case Report Abstract Author Information Abstract: Cutaneous neurocristic hamartoma is a rare developmental complex melanocytic lesion of neural crest origin in the dermis and subcutis with diverse histological differentiation including melanocytic, neurosustentacular, and mesenchymal elements. Cutis verticis gyrata is a cerebriform thickening of the scalp manifesting as folds, ridges, or creases. We report a case of cutaneous neurocristic hamartoma of the scalp in a 20-year-old woman presenting as cutis verticis gyrata. Microscopically, the lesion involved the dermis and the subcutis. Dendritic pigmented melanocytes were seen in between the collagen bands. Plexiform islands consisting of cords and palisades of spindled cells were also apparent. Immunohistochemically, HMB-45 positivity was observed in the dendritic melanocytic cells. S-100 protein was positive in dendritic melanocytes and in the Schwannian cells. The stromal cells showed CD34 staining. This lesion is presented because of its rarity, unusual clinical appearance, and resemblance to both a neurocristic hamartoma and large plaque type of blue nevus. Departments of *Pathology and †Surgery, Kasturba Medical College, A unit of Manipal University, Mangalore, Karnataka, India. Reprints: Debarshi Saha, MD (Pathology), Department of Pathology, Kasturba Medical College, A unit of Manipal University, Light House Hill Road, Mangalore 575001, India (e-mail: firstname.lastname@example.org). The authors declare no conflicts of interest. © 2014 by Lippincott Williams & Wilkins.