Signet Ring Cell Primary Cutaneous CD30+ Lymphoproliferative Disorder Presenting as a Monomorphic T-Cell Posttransplant Lymphoproliferative DiseasePapalas, John A. MD*,†; Kulbacki, Evan L. MD†; Park, H. Kim MD*; Howell, Eric R. MD*The American Journal of Dermatopathology: October 2012 - Volume 34 - Issue 7 - p e94–e96 doi: 10.1097/DAD.0b013e3182513344 Extraordinary Case Report Abstract Author Information Abstract: T-cell posttransplant lymphoproliferative disorders are rare, with peripheral T-cell lymphoma not otherwise specified being the most common type. Although cases of the signet ring cell variant of primary cutaneous CD30+ lymphoproliferative disorder have been reported, such cases have not been described in the posttransplant setting. We describe a case with emphasis on the special contextual differential diagnostic considerations. *Eastern Dermatology and Pathology, Greenville †Department of Pathology, Duke University Medical Center, Durham, NC. Reprints: John A. Papalas, MD, Department of Pathology, Box 3712, Duke University Medical Center, Durham, NC 27710 (e-mail: papalas@easterndermatology). The authors declare no conflicts of interest. © 2012 Lippincott Williams & Wilkins, Inc.