ESR1 and invasive ductal breast carcinoma: An 89-year-old woman with a history of right breast invasive ductal carcinoma (estrogen receptor (ER)+, progesterone receptor (PR)+, HER2-) diagnosed in 2011, treated with quadrantectomy, adjuvant, and anastrozole (completed 2018), presented in February 2023 with right ocular redness and mucous membrane changes localized to the inferior fornix.