Functional characterization of nonmetastatic paraganglioma and pheochromocytoma by (18) F-FDOPA PET: focus on missed lesions - PubMed (original) (raw)

Multicenter Study

Functional characterization of nonmetastatic paraganglioma and pheochromocytoma by (18) F-FDOPA PET: focus on missed lesions

Sophie Gabriel et al. Clin Endocrinol (Oxf). 2013 Aug.

Abstract

Aims and methods: To evaluate the clinical value of (18) F-fluorodihydroxyphenylalanine ((18) F-FDOPA) PET in relation to tumour localization and the patient's genetic status in a large series of pheochromocytoma/paraganglioma (PHEO/PGL) patients and to discuss in detail false-negative results. A retrospective study of PGL patients who were investigated with (18) F-FDOPA PET or PET/CT imaging in two academic endocrine tumour centres was conducted (La Timone University Hospital, Marseilles, France and National Institutes of Health (NIH), Bethesda, MD, USA).

Results: One hundred sixteen patients (39·7% harbouring germline mutations in known disease susceptibility genes) were evaluated for a total of 195 PHEO/PGL foci. (18) F-FDOPA PET correctly detected 179 lesions (91·8%) in 107 patients (92·2%). Lesion-based sensitivities for parasympathetic PGLs (head, neck, or anterior/middle thoracic ones), PHEOs, and extra-adrenal sympathetic (abdominal or posterior thoracic) PGLs were 98·2% [96·5% for Timone and 100% for NIH], 93·9% [93·8 and 93·9%] and 70·3% [47·1 and 90%] respectively (P < 0·001). Sympathetic (adrenal and extra-adrenal) SDHx-related PGLs were at a higher risk for negative (18) F-FDOPA PET than non-SDHx-related PGLs (14/24 vs 0/62, respectively, P < 0·001). In contrast, the risk of negative (18) F-FDOPA PET was lower for parasympathetic PGLs regardless of the genetic background (1/90 in SDHx vs 1/19 in non-SDHx tumours, P = 0·32). (18) F-FDOPA PET failed to detect two head and neck PGLs (HNPGL), likely due to their small size, whereas most missed sympathetic PGL were larger and may have exhibited a specific (18) F-FDOPA-negative imaging phenotype. (18) F-FDG PET detected all the missed sympathetic lesions.

Conclusions: (18) F-FDOPA PET appears to be a very sensitive functional imaging tool for HNPGL regardless of the genetic status of the tumours. Patients with false-negative tumours on (18) F-FDOPA PET should be tested for SDHx mutations.

© 2012 John Wiley & Sons Ltd.

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Figures

Figure 1

Figure 1

Multicentric SDHD-related PGL syndrome (2 HNPGL, 2 PHEO, and 4 extra-adrenal PGL). A. Fused axial 18F-FDG PET/CT images centered over the tumours (6 positive tumours, arrows). B. Matching axial 18F-FDOPA PET/CT images show 2 positive tumours (arrows). Missed tumours on 18F-FDOPA PET/CT were located as follows: 9 mm left PHEO, 26 mm interaortocaval, 17 mm lateral caval, 6 mm iliac bifurcation.

Figure 2

Figure 2

Multicentric SDHD-related PGL syndrome (5 HNPGL, 1 thoracic and 1 extra-adrenal PGL). A. 18F-FDG PET (maximal intensity projection (MIP)). B. 18F-FDOPA PET (MIP). C. Axial contrast-enhanced CT showing a 5 mm cervical PGL of the vagus nerve missed by 18F-FDOPA PET/CT (arrow). D. Axial contrast-enhanced CT image centered on a 14 mm abdominal extra-adrenal PGL located lateral to the celiac trunk (arrow). E. Axial 18F-FDG PET image centered over the positive tumour (arrow). F. Axial 18F-FDOPA PET image centered over the false-negative abdominal extra-adrenal PGL.

Figure 3

Figure 3

Multicentric SDHB-related PGL (2 extra-adrenal PGL, 1 adrenal PHEO). A. Enhanced coronal and axial CT slices at the level of the tumours (reconstruction in the lower left image). B. Fused axial 18F-FDG PET/CT images centered over the tumours (2 positive extra adrenal tumours 28 and 13 mm in diameter, arrows). C. Fused axial 18F-FDOPA PET/CT images centered over the tumours. 18F-FDOPA-negative tumour sites were lateral aortic (at the level of the superior mesenteric artery) and preaortic (PGL derived from the organ of Zuckerkandl). False-positive uptake was seen in an enlarged left adrenal gland (top row). The adrenal gland weighed 8 g (normal 5 to 6 g) and showed cortical hyperplasia, but the adrenal medulla was normal.

Figure 4

Figure 4

Multicentric SDHD-related PGL syndrome (1 HNPGL, 1 cardiac, 2 adrenal PHEO). A. 18F-FDG PET (MIP image) showing positive cardiac PGL and bilateral PHEO (arrows). Non-specific uptake in the mediastinum corresponds to brown fat. The HNPGL is not visible on this projection. B. Coronal fused 18F-FDG PET/CT image centered over the PHEO (2 positive tumours, arrows). C. 18F-FDOPA PET (MIP image) showing positive HNPGL and cardiac PGL, negative bilateral PHEO.

Figure 5

Figure 5

Multicentric SDHD-related PGL syndrome (multiple HNPGL, 1 parasympathetic thoracic PGL, 1 sympathetic thoracic (cardiac) PGL, and 2 sympathetic retroperitoneal PGL). A. 18F-FDG PET/CT (MIP image) shows multiple foci, including uptake in a paravertebral sympathetic legion (arrow). B. Axial CT and fused 18F-FDG PET/CT images centered over the sympathetic thoracic PGL (arrows). C. 18F-FDOPA PET (MIP image) showing positive parasympathetic and extra-adrenal sympathetic PGL, but negative sympathetic thoracic PGL.

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