Article exists only in Russian.

Abstract:

The basis of computed tomography diagnosis is the definition of densitometric parameters at different phases of the study.

Aim. Was to perform comparative analysis of computed tomography features of focal nodular hyperplasia and hepatocellular carcinoma.

Materials and methods. During the reseach clinical and morphological comparisons were performed on the base of 36 patients’ CT’s results: 21 patient with hepatocellular carcinoma (HCC) and 15 patient with focal nodular hyperplasia of the liver without associated liver cirrhosis. At the preoperative stage all patients underwent spiral computed tomography with bolus contrast enhancement (on the four phases of the study).

Results. During native phase of computed tomography HCC nodes are more often hipodense irrespective of the degree of histological differentiation and focal nodular hyperplasia - izodense. After intravenous injection of contrast agent, computed tomography picture of hepatocellular carcinoma and focal nodular hyperplasia depended on the phase of the study During the arterial phase tissue of focal nodular hyperplasia in the vast majority of cases was hiperdense relative to the surrounding liver parenchyma. Hepatocellular carcinoma had similar values much less frequently in contrast to the focal nodular hyperplasia. The venous phase was characterized by the presence of hiperdense characteristics in focal nodular hyperplasia areas and, conversely, in hepatocellular carcinoma tissue signs of hiperdense were not observed. Hyperdence formations in delayed phase of computed tomography indicate the presence of focal nodular hyperplasia, and vice versa, hypodense are sufficient to prevent its presence.

Conclusion. Estimation of densitometric parameters of focal nodular hyperplasia and hepatocellular carcinoma allows to determine features of computed tomography imaging of tumors at different phases of the examination, and this allows to make a differential diagnosis between them.

Abstract:

Aim: was to study CT semiotic features of hepatocellular carcinoma (HCC) with varying degrees of differentiation in liver, unaffected by cirrhosis.

Materials and methods: the study is based on clinical and morphological comparisons of 29 patients (19 men and 10 women aged 19-68 years) suffering from HCC without associated cirrhosis. In the preoperative period all patients underwent multislice CT with bolus contrast enhancement (on four phases of the study). On CT scans were determined: localization, size, borders and structure of nodes, including features of the accumulation of contrast agent for determining the degree of histological differentiation.

Results: HCC had the appearance of a large solitary node, the average value of the largest diameter and the cross-sectional area amounted to 9.3 cm and 68.4 cm2 respectively in most of examined patients. In the native phase of CT quite distinct contour of the tumor node was determined in 40% of cases at highly differentiated and one-third of moderately differentiated HCC observations, at poorly differentiated variant contour is not expressed.The characteristic feature of CT HCC nodes is the heterogeneous nature of their internal structure, which is best visualized in the arterial phase. Most frequently in observations (in 67.6%) were detected areas of necrosis, rarely observed lesions sclerosis (23.5%) and calcifications (11.8%).

Conclusion: Computed tomographic characteristics of HCC in the absence of cirrhosis depenc on the phase of the study, and the degree of histological differentiation of tumors that should be considered in the differential diagnosis and prognosis of the disease.

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