[Local diagnostics for rectal cancer. What is realistic?]

Area of Science:

• Oncology
• Medical Imaging
• Gastroenterology

Context:

• Accurate pretherapeutic staging of rectal cancer is crucial for guiding treatment and determining prognosis.
• Current routine staging often relies on endorectal ultrasound (EUS), but its accuracy can be limited by examiner experience.
• Magnetic resonance imaging (MRI) and computed tomography (CT) offer complementary roles in staging.

Purpose:

• To evaluate the diagnostic accuracy of different imaging modalities for rectal cancer staging.
• To compare the effectiveness of endorectal ultrasound (EUS), magnetic resonance imaging (MRI), and computed tomography (CT) in assessing T and N categories.
• To highlight the importance of advanced imaging techniques for optimal patient management.

Summary:

• Endorectal ultrasound (EUS) and magnetic resonance imaging (MRI) are the most accurate tools for assessing T and N categories in rectal cancer.
• MRI excels at predicting tumor proximity to the colorectal membrane (CRM), while CT is better for detecting distant metastases.
• Routine EUS accuracy for T staging is often lower than reported in literature and depends on examiner expertise, with MRI use currently infrequent.

Impact:

• Improved diagnostic accuracy leads to more tailored and effective therapeutic strategies for rectal cancer patients.
• Understanding the strengths of EUS, MRI, and CT can optimize their utilization in clinical practice.
• Enhanced staging accuracy can significantly improve patient prognosis and reduce treatment-related morbidity.