Vimal, a 70 years old male presents with a h/o lower GI bleed for last 6 months. Sigmoidoscopic examination shows a mass, of 4 cms about 3.5 cms above the anal verge. The treatment of choice is –
**Core Concept**
The question is testing the management of rectal cancer, specifically in an elderly patient with a significant history of lower gastrointestinal bleeding. The presence of a mass on sigmoidoscopy, 3.5 cm above the anal verge, suggests a rectal cancer. The treatment of choice depends on the tumor's location, stage, and the patient's overall health.
**Why the Correct Answer is Right**
The correct answer is **D. Abdominoperineal resection (APR)**. In this scenario, the tumor is located close to the anal verge, making it a non-lifting tumor, which is a characteristic of low rectal cancers. **APR** is the surgical procedure of choice for low rectal cancers, especially when the tumor is within 5 cm of the anal verge. This procedure involves the removal of the rectum, anus, and part of the sigmoid colon, followed by a permanent colostomy. The goal is to achieve local control of the tumor and prevent recurrence.
**Why Each Wrong Option is Incorrect**
**Option A:** **Transanal endoscopic microsurgery (TEM)** is a minimally invasive procedure used for small, early-stage rectal cancers. However, it is not suitable for larger tumors like the one described in the scenario.
**Option B:** **Radiofrequency ablation (RFA)** is a treatment option for early-stage rectal cancers, but it is not effective for larger tumors or those close to the anal verge.
**Option C:** **Chemoradiation** is a treatment option for rectal cancer, but it is typically used in conjunction with surgery, not as a standalone treatment for a large, low rectal tumor.
**Clinical Pearl / High-Yield Fact**
In rectal cancer, the distance from the anal verge to the tumor is a critical factor in determining the treatment approach. Tumors within 3-5 cm of the anal verge are considered low rectal cancers and are often treated with **APR**. This is in contrast to higher rectal cancers, which can be managed with more conservative surgical approaches.
**Correct Answer: D. Abdominoperineal resection (APR)**