TY - CHAP M1 - Book, Section TI - Pigmented Nail Disorders A1 - Mayeaux, E.J. A1 - Usatine, Richard P. A2 - Usatine, Richard P. A2 - Sabella, Camille A2 - Smith, Mindy Ann A2 - Mayeaux, E.J. A2 - Chumley, Heidi S. A2 - Appachi, Elumalai PY - 2015 T2 - The Color Atlas of Pediatrics AB - A four-year-old boy presents with a newly pigmented line on his right thumb for 6 months. He already had one pigmented line on that same thumb since age one. His parents want to know if this pigmentation is dangerous. The child is otherwise healthy. On examination there are two longitudinal pigmented lines easily visible on the right thumbnail (Figure 161-1A). The boy is referred to a pediatric dermatologist. Examination with a dermatoscope shows the details of the many lines and confirms his concern for melanoma (Figure 161-1B). The concerns are expressed to the parents and the child is set up for a nail matrix biopsy with sedation. The differential diagnosis also includes a congenital melanocytic nevus that is growing. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/03/28 UR - accesspediatrics.mhmedical.com/content.aspx?aid=1114877582 ER -