Oligoarticular arthritis, 1012 Oligomenorrhea associated with hyperandrogenism, 344 caloric intake and, 344 definition, 341 differential diagnosis, 342 t evaluation and decision, 343 f approach to diagnosis, 345 examination, 341 history, 341 of nonpregnant patients, 342 –343 pregnancy, 341 –342 vital signs, 341 psychosocial stressors and, 345 Omental cysts, 1307 Ominous signs, 1410 Omphalitis, 337 Omphalomesenteric duct, 1310 , 1353 Omphalomesenteric remnants, 1311 f Oncologic emergencies bone tumors, 918 –919 care of patients with advanced cancer, 932 –934 central nervous system, tumors of, 907 –909 chemotherapy-induced nausea and vomiting (CINV), management, 929 , 930 t complications associated with cancer and cancer therapy, management of acute alteration in mental status, 928 t acute complications of selected drugs, 921 t cardiovascular, 928 t–929 t of CAR-T cell therapy, 924 –925 , 932 genitourinary, 931 hematologic, 920 –922 hematopoietic stem cell transplantation, 932 , 933 t hepatic and gastrointestinal, 929 –931 infectious, 922 –924 metabolic, 925 –926