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Review ArticleTeaching Case Studies

Malignant Peripheral Nerve Sheath Tumors of the Pericardium in a Patient with Neurofibromatosis Type 1: The Diagnostic Value of 18F-FDG PET/CT and 123I-MIBG SPECT/CT

Mathieu Charest, Josephine Pressacco and Jaramie Thomas-Gittens
Journal of Nuclear Medicine Technology March 2018, 46 (1) 61-62; DOI: https://doi.org/10.2967/jnmt.117.199927
Mathieu Charest
1Nuclear Medicine Department, Hôpital du Sacré-Coeur de Montréal, Montréal, Canada
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Josephine Pressacco
2Radiology Department, Hôpital du Sacré-Coeur de Montréal, Montréal, Canada; and
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Jaramie Thomas-Gittens
3Radiology Department, Université de Montréal, Montréal, Canada
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Abstract

A 25-y-old woman with known neurofibromatosis type 1 and a large anterior mediastinal mass was investigated. 18F-FDG PET/CT revealed a radiotracer-avid anterior mediastinal mass having an SUVmax of 4.3 and demonstrating a hypoactive center. The 123I-metaiodobenzylguanidine SPECT/CT study performed subsequently did not demonstrate any uptake, thereby excluding, for the most part, the diagnosis of paraganglioma or neuroblastoma. At final pathology, a malignant peripheral nerve sheath tumor of the pericardium with areas of chondrosarcomatous and angiosarcomatous differentiation was diagnosed.

  • malignant peripheral nerve sheath tumors
  • neurofibromatosis type 1
  • pericardium
  • anterior mediastinum
  • FDG
  • PET/CT

We report the case of a woman with known neurofibromatosis type 1 and a large anterior mediastinal mass in whom the combination of 18F-FDG and 123I-metaiodobenzylguanidine allowed us to correctly orient the diagnosis toward a primary malignant tumor of the pericardium and characterize its heterogeneity.

CASE REPORT

A 25-y-old woman with known neurofibromatosis type 1 came to the emergency room complaining of palpitations and chest pain. The initial work-up, including thoracic CT, revealed a large pericardial collection. After pericardiocentesis, a large anterior mediastinal mass was demonstrated by cardiac ultrasound, leading to further investigation.

18F-FDG PET/CT images (Figs. 1A and 1B), along with corresponding slices of a contrast-enhanced thoracic CT (Fig. 1C), revealed a radiotracer-avid anterior mediastinal mass having an SUVmax of 4.3 and demonstrating a hypoactive center. The tumor-to-liver ratio was measured at 2.85. The mediastinal mass was deemed malignant on the basis of these findings. No distant active lesion was detected.

FIGURE 1.
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FIGURE 1.

18F-FDG PET (A), PET/CT (B), and CT (C) reveal radiotracer-avid anterior mediastinal mass with hypoactive center. 123I-metaiodobenzylguanidine SPECT (D) and SPECT/CT (E) show no radiotracer uptake by mediastinal mass.

The 123I-metaiodobenzylguanidine SPECT/CT study (Figs. 1D and 1E) performed subsequently did not demonstrate any radiotracer uptake by the mediastinal mass, thereby excluding, for the most part, the diagnosis of paraganglioma or neuroblastoma.

At final pathologic examination of the surgically removed lesion, a malignant peripheral nerve sheath tumor of the pericardium with areas of chondrosarcomatous and angiosarcomatous differentiation was diagnosed.

DISCUSSION

Neurofibromatosis patients carry up to a 10% lifetime risk of developing a malignant peripheral nerve sheath tumor, although this type of tumor is rare in the general population (<0.1%) (1). 18F-FDG PET/CT was found to be highly sensitive and specific for the diagnosis of malignant peripheral nerve sheath tumor in neurofibromatosis type 1 patients (1–3). Warbey et al. reported a sensitivity of 0.97 and specificity of 0.87 using a cutoff SUVmax of 3.5 (4). Salamon et al. proposed a tumor-to-liver ratio of more than 2.6 as being more specific (5). Both criteria were met in our case.

CONCLUSION

The combination of 18F-FDG and 123I-metaiodobenzylguanidine allowed us to correctly orient the diagnosis toward a primary malignant tumor of the pericardium and characterize its heterogeneity.

DISCLOSURE

No potential conflict of interest relevant to this article was reported.

Footnotes

  • Published online Nov. 10, 2017.

REFERENCES

  1. 1.↵
    1. Benz MR,
    2. Czernin J,
    3. Dry SM,
    4. et al
    . Quantitative F18-fluorodeoxyglucose positron emission tomography accurately characterizes peripheral nerve sheath tumors as malignant or benign. Cancer. 2010;116:451–458.
    OpenUrlCrossRefPubMed
  2. 2.
    1. Khiewvan B,
    2. Macapinlac HA,
    3. Lev D,
    4. et al
    . The value of 18F-FDG PET/CT in the management of malignant peripheral nerve sheath tumors. Eur J Nucl Med Mol Imaging. 2014;41:1756–1766.
    OpenUrl
  3. 3.↵
    1. Maurer AH,
    2. Burshteyn M,
    3. Adler LP,
    4. Steiner RM
    . How to differentiate benign versus malignant cardiac and paracardiac 18F FDG uptake at oncologic PET/CT. Radiographics. 2011;31:1287–1305.
    OpenUrlCrossRefPubMed
  4. 4.↵
    1. Warbey VS,
    2. Ferner RE,
    3. Dunn JT,
    4. Calonje E,
    5. O’Doherty MJ
    . [18F]FDG PET/CT in the diagnosis of malignant peripheral nerve sheath tumours in neurofibromatosis type-1. Eur J Nucl Med Mol Imaging. 2009;36:751–757.
    OpenUrlCrossRefPubMed
  5. 5.↵
    1. Salamon J,
    2. Veldhoen S,
    3. Apostolova I,
    4. et al
    . 18F-FDG PET/CT for detection of malignant peripheral nerve sheath tumours in neurofibromatosis type 1: tumour-to-liver ratio is superior to an SUVmax cut-off. Eur Radiol. 2014;24:405–412.
    OpenUrlCrossRefPubMed
  • Received for publication July 26, 2017.
  • Accepted for publication September 11, 2017.
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Journal of Nuclear Medicine Technology: 46 (1)
Journal of Nuclear Medicine Technology
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March 1, 2018
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Malignant Peripheral Nerve Sheath Tumors of the Pericardium in a Patient with Neurofibromatosis Type 1: The Diagnostic Value of 18F-FDG PET/CT and 123I-MIBG SPECT/CT
Mathieu Charest, Josephine Pressacco, Jaramie Thomas-Gittens
Journal of Nuclear Medicine Technology Mar 2018, 46 (1) 61-62; DOI: 10.2967/jnmt.117.199927

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Malignant Peripheral Nerve Sheath Tumors of the Pericardium in a Patient with Neurofibromatosis Type 1: The Diagnostic Value of 18F-FDG PET/CT and 123I-MIBG SPECT/CT
Mathieu Charest, Josephine Pressacco, Jaramie Thomas-Gittens
Journal of Nuclear Medicine Technology Mar 2018, 46 (1) 61-62; DOI: 10.2967/jnmt.117.199927
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Keywords

  • malignant peripheral nerve sheath tumors
  • neurofibromatosis type 1
  • pericardium
  • anterior mediastinum
  • FDG
  • PET/CT
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