Management of Suspected Malignant Sigmoid Colon Mass

Diagnostic Confirmation and Staging

The American Society of Clinical Oncology recommends obtaining tissue diagnosis through colonoscopic biopsy to confirm malignancy histopathologically 1, 2, 3
Complete staging workup must include CT chest with IV contrast to evaluate for pulmonary metastases, CT abdomen/pelvis with IV contrast to assess liver metastases and extent of local disease, complete blood count, liver function tests, renal function tests, and carcinoembryonic antigen (CEA) level 1, 2, 3
Complete colonoscopy of the entire large bowel is recommended if not already performed, or plan for postoperative colonoscopy if proximal colon not accessible due to obstruction 1, 2, 3

Comprehensive geriatric assessment (CGA) is strongly recommended before proceeding with surgery in elderly patients, as it helps evaluate biological age versus chronological age 4
The assessment should include cancer-specific evaluation, evaluation of common physiological effects of aging, physical and mental ability assessment, social support evaluation, and comorbidity assessment 4
Involving a geriatrician in management is recommended if the patient has physical or psychological comorbidities identified on CGA 4

Surgery remains the definitive and most successful treatment modality for colorectal tumors, with operative mortality considerations showing postoperative mortality increases with age 4

Adjuvant chemotherapy decisions depend on final pathologic staging after surgical resection, with fluorouracil-based regimens demonstrating survival benefit for Stage III disease 1, 2, 3
Treatment decisions in elderly patients must balance efficacy against toxicity and patient goals of care 4

Structured surveillance is essential to identify patients requiring salvage surgery or palliative care, with recommended follow-up including history and rectosigmoidoscopy every 6 months for 2 years, liver imaging annually for 3 years, and colonoscopy every 5 years to detect second primary cancers 1, 2, 3

Delaying surgery based solely on chronological age is not recommended, as biological age and functional status are more important determinants of surgical candidacy 4
Undertaking surgery without adequate preoperative assessment in elderly patients can significantly increase operative risk 4
Assuming all elderly patients want aggressive treatment is not recommended, as goals of care discussion is essential 4
Inadequate lymph node resection can lead to inaccurate staging and suboptimal oncologic outcome, with a recommended minimum of 12 lymph nodes examined 1, 2, 3

When an obstructing tumor prevents a complete pre‑operative colonoscopic assessment, a colonoscopy should be performed after resection to evaluate the remaining colon. 5

Years 1–2: Conduct a history and physical examination every 3–6 months. (Based on NCCN recommendations) 6
Years 3–5: Conduct a history and physical examination every 6 months. (Based on NCCN recommendations) 6
Beyond 5 years: Perform an annual history and physical examination. (Based on NCCN recommendations) 6

The first surveillance colonoscopy should be scheduled 1 year after curative resection. 5
If the 1‑year colonoscopy shows no abnormal findings, repeat colonoscopy every 3–5 years to detect metachronous lesions. 5

A comprehensive post‑treatment surveillance program—including regular clinical assessments, carcinoembryonic antigen monitoring, and annual cross‑sectional imaging—should be instituted to identify recurrences amenable to salvage therapy. 5