A 46 year-old woman presented to the emergency department with hematemesis associated with syncope. The patient's only complaint was severe and diffuse abdominal pain that prohibited her from providing further history. According to her family, she had melena while at home and was found in the bathroom unconscious. The patient spontaneously regained consciousness before arrival of the emergency medical services. She denied any NSAID or aspirin use, although she was on daily enoxaparin for deep vein thrombosis that was extending from her inferior vena cava to her femoral vein. On her arrival at the emergency department, gastroenterology, general surgery, interventional radiology, and intensive care unit teams were consulted about the emergency.The patient's prior medical history started with diagnosis with stage IIIC (T3N2M0) sigmoid adenocarcinoma two years previously, in the setting of rectal bleeding. She underwent a left hemi-colectomy, partial cystectomy, and left ovarian and left fallopian tube resection. She subsequently received adjuvant oxaliplatin, capcitabine, and bevacizumab. She was also treated with radiation therapy of the peri-aortic lymph nodes because, at the time of surgery, four out of 21 lymph nodes were positive. Four months before admission, the patient presented with a small bowel obstruction resulting in operative intervention that included lysis of adhesions, partial resection of the ileum with side-to-side entero-enterostomy, cystoscopy with left ureteral catheter, and lymph node dissection. The histology demonstrated involvement of the retroperitoneal and peri-aortic lymph nodes and ileal serosa. Consequently, she was treated with irinotecan and bevacizumab.During the four weeks before this most recent admission, she had been hospitalized several times, most recently four days before admission, with nausea, vomiting, and abdominal pain that were attributed to gastroparesis secondary to narcotics, with chemotherapy and paraneoplastic phenomena considered as additional possible contributing factors. Specifically, the patient's generalized abdominal pain was attributed to her metastatic disease and gastroparesis.The patient did not have any other pertinent medical, social, or family history. Her medications included enoxaparin, dilaudid, pantoprazole, desipramine, compazine, gabapentin, lorazepam, lomotil, ondansetron, metoclopramide, and fentanyl patch.She had several gastrointestinal studies leading to her most recent presentation. A colonoscopy performed one year before this admission did not demonstrate any abnormalities. A gastric emptying study performed two months before admission showed 52% retention at 4 h (normal \10%). During that same hospitalization, the patient had an upper endoscopy showing granular gastric mucosa with histology showing H. pylori-negative mild chronic gastritis. Two months before admission, a brain MRI scan did not reveal metastatic disease.On examination in the emergency department, the patient was afebrile, tachycardic (HR 139), hypotensive (89/62), tachypn...