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Transrectal ultrasonography versus computed tomography in staging rectal carcinoma
K N Ramana1, P V Murthy, K P Rao
1Department of Gastroenterology, Osmania Medical College, Hyderabad.
Summary
Transrectal ultrasonography (TRUS) excels at staging early rectal carcinoma, identifying wall invasion and fat infiltration. Computed tomography (CT) is better for advanced disease detection.
Area of Science:
- Oncology
- Medical Imaging
- Gastroenterology
Background:
- Accurate staging of rectal carcinoma is crucial for effective treatment planning.
- The extent of disease dictates therapeutic strategies for rectal cancer.
Purpose of the Study:
- To evaluate the efficacy of transrectal ultrasonography (TRUS) and computed tomography (CT) in staging rectal carcinoma.
- Comparing the diagnostic capabilities of TRUS and CT for rectal cancer staging.
Main Methods:
- Ten patients diagnosed with rectal carcinoma underwent both TRUS and CT scans (plain and contrast-enhanced).
- Findings from TRUS and CT were correlated with surgical findings for accuracy assessment.
Main Results:
- TRUS accurately detected wall invasion in all ten cases and perirectal fat infiltration in five cases.
- TRUS identified lymph node involvement in five cases, while CT detected it in two of six cases.
- CT identified distant metastasis to the bladder in one case, which TRUS missed.
Conclusions:
- TRUS is a cost-effective imaging modality superior to CT for staging early-stage rectal carcinoma.
- The primary limitation of TRUS is its limited penetration depth.
- CT remains valuable for diagnosing advanced rectal carcinoma and detecting distant metastases.