title: A Case of Assisted Reproductive Therapy-induced Erythema Nodosum.
abstract: Erythema nodosum is a common variant of panniculitis. It is characterized by tender erythematous nodule and plaque on the anterior aspect of the leg. The etiology is not fully understood. It may be associated with a variety of disorders, including infection, medication, autoimmune disorders, pregnancy, and malignancy. A 33-year-old Korean woman presented with 1 week history of painful erythematous plaques on both knees. She was 7 weeks pregnant with assisted reproductive therapy, and had been maintained on daily intramuscular progesterone injection for 4 weeks. Histological examination of the lesions revealed septal panniculitis without vasculitis. Two days after discontinuing progesterone injection, the symptoms and lesions started to resolve. Herein we present a case of erythema nodosum caused by progesterone injection for endometrial preparation.
authors: Department of Dermatology, Seoul National University Boramae Hospital, Seoul, Korea.
authors: Hye Chan
authors: HC
authors: Jeon
authors: Mira
authors: M
authors: Choi
authors: Seung Hwan
authors: SH
authors: Paik
authors: Sun Jae
authors: SJ
authors: Na
authors: Jong Hee
authors: JH
authors: Lee
authors: Soyun
authors: S
authors: Cho