In this issue of Surgical Oncology Clinics, guest editor Dr. Alex Kim brings his considerable expertise to the topic of Peritoneal Surface Malignancy. Treatment for peritoneal surface malignancy (PSM) has advanced dramatically over the past decade, and in this issue, top experts discuss key topics such as pathology, classification, imaging, and therapeutics, as well as surgical advances in colorectal, gastric, appendiceal, and gynecologic cancer peritoneal metastasis.