In the colon, which is benign and has no significant tendency to undergo malignant transformation?

Related MCQs

• Which of the following lesions of the colon has the least tendency to undergo malignant transformation?
• A 63-year-old man is evaluated because of a several-month history of increasing fatigue and some vague upper abdominal discomfort. His medical history includes gastroesophageal reflux disease, coronary artery disease, and clinical depression, all of which are well controlled with medications. The patient has been working full time. On physical examination, he has mild hepatomegaly. His hemoglobin is 12.2 g/dL, serum alkaline phosphatase level 280 U/L, and serum aspartate aminotransferase level 65 U/L. CT scan of the abdomen and pelvis shows multiple hepatic lesions ranging in size from 1 cm to 4 cm; mesenteric, para-aortic, and paracaval lymphadenopathy, and a colonic mass at the splenic flexure. Colonoscopy reveals a nonobstructing, non bleeding lesion; biopsy shows it to be poorly differentiated adenocarcinoma. Fine- needle aspiration of one of the liver lesions confirms the presence of malignant cells consistent with a primary colon cancer. What is the most appropriate next step in
• A 68-year-old man presents to his primary care physician for a routine physical examination. The patient‟s medical history is significant for hypertension. The patient is found to have guaiac-positive stools and is subsequently referred for colonoscopy. Colonoscopy reveals a “golf ball”-size, near-obstructing tumor in the descending colon, not admitting the scope. The biopsy is positive for adenocarcinoma of the colon. Which of the following is the next step in the management of this patient?
• Carcinoid tumors have a varied malignant potential. The most benign are located in the:
• Adenocarcinoma of the ascending colon is more likely than adenocarcinoma of the sigmoid colon to:
• In contrast to carcinoma of the right colon, carcinoma of the left colon tends to be associated with:
• A 66-year-old black woman diagnosed with stage III colon cancer underwent definitive resection of the primary tumor 3 years ago. After surgery, she received adjuvant chemotherapy with 5-fluorouracil and leucovorin. Approximately 20 months later, she developed metastatic disease in the liver (five lesions in right and left lobe) and lungs (one lesion in the right and left lobe). She was treated with irinotecan, 5-fluorouracil, and leucovorin, and had a partial response to therapy. One month ago, disease progression was documented on restaging CT scans. The patient‟s laboratory studies show relatively normal organ function. She has fatigue, decreased appetite, and has noticed a 2.3-kg (5-Ib) weight loss over the past 3 months. She has stopped participating in weekend bike trips with a cycling club, but remains involved in church and family activities and states that she wants to be as aggressive as possible in fighting the cancer. What is the most reasonable recommendation for this patie
• A 72-year-old man is evaluated because of constipation, abdominal pain, and distention that have worsened over the past week. Two years ago, he was diagnosed with stage III rectal cancer (primary tumor and renal involvement) and underwent low anterior resection. Chemotherapy with 5-fluorouracil and leucovorin followed, and pelvic radiation was given with concurrent infusion of 5-fluorouracil. He has been having regular bowel movements, and results of his most recent colonoscopy (1 year ago) were unremarkable. On physical examination, his pulse rate is 100/min. He has orthostatic hypotension, a slightly distended abdomen with hyperactive bowel sounds, and some guarding to deep palpation in the left lower quadrant. Plain radiograph of the abdomen shows distended loops of small bowel, with no stool in the distal colon or rectum. The patient is hospitalized for bowel rest and intravenous hydration. What is the next step in this patient‟s management?
• A 61-year-old man with a 120-pack-year smoking history is evaluated for a persistent and worsening cough and found to have a 3-cm mass in the right upper lobe on chest radiography. CT-directed needle biopsy is positive for squamous cell carcinoma. CT scans of the abdomen and pelvis, bone scan, and MRI of the head are negative for metastatic disease. Positron emission tomography scan shows uptake only in the right upper lobe mass, and pulmonary function tests indicate that the patient has adequate pulmonary reserve to undergo resection. The patient undergoes a right upper lobectomy. All margins are clear, and all peribronchial lymph nodes are negative for tumor within the resected specimen. What is the most reasonable adjuvant therapy for this patient?
• A 50 year old male presents with widespread lymphadenopathy. He has had recent fever and weight loss. A trucut biopsy reveals a malignant tumor with the following phenotype; Cytokeratin negative, CLA positive, CD3 positive, and CD30 positive