The role of Tc-99m-2-Methoxy-Isobutyl-Isonitrile Single Photon Emission Computed Tomography in visualizing anterior mediastinal tumor and differentiating histologic type of thymoma
| Autor: | Luigi Mansi, Mario Santini, Antonio Rotondo, Alfonso Fiorelli, Giovanni Vicidomini, P. F. Rambaldi, Paolo Laperuta |
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| Přispěvatelé: | Fiorelli, Alfonso, Vicidomini, Giovanni, Laperuta, P, Rambaldi, Pier Francesco, Mansi, Luigi, Rotondo, Antonio, Santini, Mario |
| Rok vydání: | 2010 |
| Předmět: |
Pulmonary and Respiratory Medicine
Adult Male Technetium Tc 99m Sestamibi Tomography Emission-Computed Single-Photon/methods Thymoma Adolescent Mediastinal tumor Malignancy Mediastinal Neoplasms Benign tumor Diagnosis Differential Young Adult Carcinoma Medicine Humans Prospective Studies Thymic carcinoma Aged Neoplasm Staging Thymus Neoplasms/radionuclide imaging Tomography Emission-Computed Single-Photon business.industry General Medicine Thymus Neoplasms Middle Aged medicine.disease Mediastinal Neoplasm Technetium Tc 99m Sestamibi/diagnostic use Surgery Female Radiopharmaceuticals Cardiology and Cardiovascular Medicine business Nuclear medicine Tomography X-Ray Computed |
| Zdroj: | European journal of cardio-thoracic surgery : official journal of the European Association for Cardio-thoracic Surgery. 40(1) |
| ISSN: | 1873-734X |
| Popis: | Objective: To evaluate the usefulness of (99m)Tc-2-Methoxy-Isobutyl-Isonitrile Single Photon Emission Computed Tomography (MIBI-SPECT) for assessing anterior mediastinal mass, and distinguishing the grade of malignancy of thymic epithelial tumors to offer guidance for decision making. Methods: From January 2006 to November 2009, 31 consecutive patients with an anterior mediastinal mass at CT were enrolled. All patients underwent (99m)Tc-MIBI-SPECT before invasive diagnostic procedures and/or surgical resection. The uptake of the mediastinal tumor (T) was compared with the normal tissue (N) and the T/N ratio was calculated to define the metabolic activity of the lesions. Patients were divided into six groups according histologic patterns, which were then correlated to the T/N value: benign tumor (BT), lymphoma (LYM), other malignant tumor (OMT), and low-risk thymoma (LRT) including types A, AB, and B1, high-risk thymoma (HRT) including types B2 and B3, and thymic carcinoma (TC). Results: There were five BT, eight LRT (four = A, two = AB, and two = B1), four HRT (three = B2 and one = B3), four thymic carcinoma, six LYM and four OMT. The T/N value of BT, LRT, HRT, CT, LYM, and OMT was 1.3 +/- 0.3, 1.3 +/- 0.2, 1.8 +/- 0.3, 2.7 +/- 0.5, 2.8 +/- 0.1, and 2.9 +/- 0.2, respectively. The T/N ratio of BT and of LRT was significantly lower than that of HRT, of CT, of LYM, and of OMT (p < 0.05), while there is no significant difference of MIBI uptake between BT and LRT. MIBI uptake in HRT was significantly lower than that in TC, LYM, and OMT (p < 0.05), whereas no significant difference was found between the different types of malignant lesions (TC, LYM, and OMT). Regarding thymoma, the degree of MIBI accumulation significantly increased as the World Health Organization (WHO) classification shifted from type A to type B and to TC. Yet, the T/N value of stages I and II was significantly lower than that of stages III and IV. The size of the lesion and the presence of myasthenia were not correlated with MIBI uptake. Conclusion: (99m)Tc-MIBI-SPECT seems to be useful in the evaluation of malignancy in anterior mediastinal mass, and is significantly correlated with the WHO classification and the Masaoka stage. Thus, this technique may add further information to morphological studies for decision making. (C) 2011 European Association for Cardio-Thoracic Surgery. Published by Elsevier B. V. All rights reserved. |
| Databáze: | OpenAIRE |
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