Consider the following medical report that includes the patient's historical health records. Use it to predict the disease that the patient is high likely exposed to. 

 Medical Report: history of present illness: this 87 year-old man with history of hypertension is admitted with abdominal pain and obstipation. patient was seen several days ago at an outside hospital, was given enemas without relief and was sent home with lactulose. he has had increasing amounts of constipation associated with come cramping pain and nausea and vomiting. he denies any fevers or chills. in the emergency he was noted to have a sodium of 128, potassium of 3,1, past medical history notable for hypertension, benign prostatic hypertrophy and history of constipation. present medications include mavik, lactulose, hydrochlorothiazide, proscar and multivitamins. he is not allergic to any medications. physical examination: he is a well developed gentleman, temperature is 98.9. he is awake and alert, nontoxic appearing. the neck was supple. the chest was clear. the abdomen was softly distended with mild periumbilical tenderness and positive bowel sounds. rectal examination showed normal tone without any stool. there was trace guaiac positive mucus. extremities notable for venous stasis changes. admission laboratory: was notable for a sodium of 128, potassium 3.1, chloride of 90, bun of 30, creatinine of 1.0, glucose of 166, hematocrit of 34.5, white blood cell count of 14,000. kub showed multiple dilated loops of bowel, both in the colon and in the small bowel. hospital course: patient was admitted with the diagnosis of constipation, question intestinal obstruction. he was made n.p.o. he was seen in consultation by the gastrointestinal service. enemas were given without improvement. this became more clear to be a colonic obstruction, though an ileus was a possibility with the hypokalemia. the potassium was repleted. a barium was performed which showed a mass of the splenic flexure. the patient was then seen in consultation by the surgical service where he was prepared for surgery. on he underwent a subtotal colectomy with findings of very dilated colon. a primary anastomosis was performed. in the operating room he developed a supraventricular tachycardia which was broken with magnesium and become more hypoxic requiring peep. postoperatively he was admitted to the medical intensive care unit for telemetry. he required ventilation for several days. he was begun on total parenteral nutrition. he continued to be weaned on the ventilator and was begun on antibiotics for question of pneumonia. he was extubated on . he continued to need some significant pulmonary toilet. bowels seemed to open up and he was progressed to diet. his total parenteral nutrition was discontinued. he was then discharged on . final diagnosis: 1. obstructing colon cancer. 2. supraventricular tachycardia. 3. hypokalemia. 4. history of benign prostatic hypertrophy. 5. hypertension. surgical procedures: subtotal colectomy. discharge medications: tylenol with codeine for pain, mavik, hydrochlorothiazide, proscar. , m.d. dictated by: medquist36 procedure: parenteral infusion of concentrated nutritional substances other and unspecified partial excision of large intestine other small-to-large intestinal anastomosis diagnoses: pneumonia, organism unspecified unspecified essential hypertension acute respiratory failure malignant neoplasm of splenic flexure 

Answer: The patient is high likely exposed to