1. Functional and metabolic imaging in transthoracic biopsies guided by computed tomography.
- Author
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Zurstrassen CE, Tyng CJ, Guimarães MD, Barbosa PNVP, Pinto CAL, Bitencourt AGV, Gross JL, Lima ENP, Cavalcante ACBS, Matushita Junior JPK, and Chojniak R
- Subjects
- Adult, Aged, Cross-Sectional Studies, Female, Fluorodeoxyglucose F18 pharmacology, Humans, Male, Middle Aged, Prospective Studies, Radiopharmaceuticals pharmacology, Diffusion Magnetic Resonance Imaging methods, Image-Guided Biopsy methods, Lung diagnostic imaging, Lung Neoplasms diagnosis, Positron Emission Tomography Computed Tomography methods
- Abstract
Objectives: CT-guided biopsy of indeterminate lung lesions sometimes provides insufficient histological results due to tumor necrosis. Functional and metabolic methods such as DWI-MR and PET-CT may help by directing sample collection to a lesion area of greater biological representativeness. The objective is to evaluate the histopathological results based on findings on ADC and SUV levels in lung lesions suspected for primary cancer., Methods: Tissue samples were evaluated after undergoing biopsies guided by either DWI-MR or PET-CT findings. In each patient, sample collection from two lesion areas was guided by local ADC and SUV. Values were used to define areas of low vs. high suspicion for cancer., Results: Patients who underwent DWI-MR had median lesion size of 78.0 mm. Areas of higher suspicion (HSA) had a median ADC of 1.1 × 10
-3 mm2 /s, while areas of lower suspicion (LSA) had median ADC of 1.8 × 10-3 mm2 /s (p = 0.0001). All HSA samples and 71.43% of LSA samples were positive for cancer (p = 0.0184). Patients who performed PET-CT had median lesion size of 61.0 mm. Median SUV was 7.1 for HSA and 3.9 for LSA (p = 0.0002). Positivity for cancer was observed in 76.9% of samples for both HSA and LSA (p = 0.0522)., Conclusion: Use of DWI-MR and PET-CT showed that tumors are functional and metabolically heterogeneous and that this heterogeneity has implications for histopathological diagnosis., Key Points: • Lung cancer is heterogeneous regarding functional and metabolic imaging. • Tumor heterogeneity may have implications in histopathological diagnosis. • Intralesional lower levels of ADC target highly suspected areas with a significant improvement in lung cancer diagnosis.- Published
- 2020
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