Perianal basosquamous carcinoma treated with radiation therapy, a case report - Kwan, Stephanie Y.; Castillo, Dani Ran; Aka, Allison A.; Kandala, Gokul; Tsai, James Y.; Zmaj, Kristine; Reeves, Mark E.; Yang, Gary Y. (Journal of Gastrointestinal Oncology, 2023)