[Dynamic CT scan of hepatic tumors]

Area of Science:

• Radiology
• Oncology
• Hepatology

Background:

• Hepatic tumors encompass various pathologies including hepatoma, metastatic disease, hemangioma, and adenoma.
• Accurate differentiation of hepatic tumors is crucial for effective treatment planning.

Purpose of the Study:

• To analyze dynamic computed tomography (CT) findings in pathologically confirmed hepatic tumors.
• To identify specific CT enhancement patterns indicative of different hepatic tumor types.
• To evaluate the utility of dynamic CT in treatment planning for hepatic tumors.

Main Methods:

• Review of dynamic CT scans from 44 patients with pathologically proven hepatic tumors.
• Administration of 50 ml contrast medium via bolus injection.
• Serial scanning at 15, 25, 60, 120, and 300 seconds post-injection.
• Classification of tumor enhancement patterns into three types based on time-density curves.

Main Results:

• Three enhancement patterns were identified: Type 1 (rapid, prolonged enhancement), Type 2 (rapid rise, rapid decline), and Type 3 (minimal change).
• All cavernous hemangiomas exhibited Type 1 enhancement.
• Parafocal enhancement was observed in 83.3% of primary hepatic carcinomas and considered pathognomonic for hepatoma.
• Type 2 and Type 3 patterns were not specific for tumor differentiation.

Conclusions:

• Dynamic CT demonstrates characteristic enhancement patterns that can aid in the diagnosis of hepatic tumors.
• Parafocal enhancement is a highly specific sign for primary hepatoma.
• Dynamic CT imaging is valuable for treatment planning in patients with hepatic tumors.