New staging techniques. Endoscopic ultrasound

Area of Science:

• Oncology
• Medical Imaging
• Gastroenterology

Background:

• Rectal cancer staging is crucial for treatment planning.
• Accurate assessment of tumor invasion and lymph node status is essential.
• Computed tomography (CT) has limitations in evaluating local rectal cancer spread.

Purpose of the Study:

• To evaluate the accuracy and utility of rectal ultrasonography in staging rectal cancer.
• To compare ultrasound's effectiveness against CT scans for specific staging parameters.
• To identify challenges and future potential of ultrasound in rectal cancer management.

Main Methods:

• Detailed imaging of rectal tumors using rectal ultrasonography.
• Assessment of tumor invasion depth and lymph node involvement.
• Comparison of ultrasound findings with CT scans for liver metastasis evaluation.

Main Results:

• Ultrasound provides superior assessment of tumor invasion and lymph node status compared to CT.
• CT remains the preferred method for detecting liver involvement.
• Ultrasound utility is limited for cancers above the peritoneal reflection due to unchanged management.
• Inflammation and difficulty in assessing muscularis propria invasion are key causes of overstaging.

Conclusions:

• Rectal ultrasonography is a highly accurate tool for staging rectal cancer, particularly for local invasion and lymph node assessment.
• While challenges exist, advancements in ultrasound-guided fine-needle aspiration cytology may improve lymph node staging.
• Surgery remains the primary treatment, with emerging techniques like high-intensity focused ultrasound offering future therapeutic possibilities.