Muehrcke Lines Associated to Active Rheumatoid ArthritisChávez-López, Mario Alfredo MD*; Arce-Martínez, Francisco Javier MD†; Tello-Esparza, Adolfo MD*JCR: Journal of Clinical Rheumatology: January 2013 - Volume 19 - Issue 1 - p 30–31 doi: 10.1097/RHU.0b013e31827d8a45 Case Reports Abstract Author Information Abstract: Careful examination of the fingernails and toenails can help to detect underlying systemic diseases. Physicians should look for shape, growth, or color changes in the nails; the transverse nail discolorations include different diagnostic possibilities such as Muehrcke lines and Mees lines. Leukonychia striata or Muehrcke lines are transverse nail bands of discoloration that are unspecific, and there are around 70 different causes that include cancer treatment and less commonly rheumatic diseases. In this case, we report the unusual presentation of Muehrcke lines associated with active rheumatoid arthritis. From the Departments of *Rheumatology and †Dermatology, Centenario Hospital Miguel Hidalgo, Aguascalientes, México. The authors declare no conflict of interest. Correspondence: Mario Alfredo Chávez-López, MD, Department of Rheumatology, Centenario Hospital Miguel Hidalgo, Galeana sur 465, Col. Obraje, 20230, Aguascalientes, México. E-mail: firstname.lastname@example.org. © 2013 Lippincott Williams & Wilkins, Inc.