Hidradenitis suppurativa after radiotherapy for uterine adenocarcinoma: A typical example of an isoradiotopic response

To the Editor: We read with great interest the case report by Haber et al1 in the May 2017 issue of JAAD Case Reports which described a 57-year-old woman who developed radiation-induced hidradenitis suppurativa (HS) after radiotherapy (RT) for uterine adenocarcinoma. In this patient, HS appeared 1 year after the last cycle of RT and, interestingly, the lesions were strikingly contained within the distinct margins of the radiation treatment, clearly indicating induction by ionizing radiation.