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High 18F-fluorothymidine uptake for invasive thymoma.

Chia-Ju Liu¹, Jane Wang, Wen-Hung Kuo

¹Department of Nuclear Medicine, National Taiwan University Hospital, Taipei, Taiwan.

Clinical Nuclear Medicine

|September 11, 2012

Summary

An incidental invasive thymoma was discovered using 18F-FLT PET imaging in a patient undergoing breast lesion evaluation. This case highlights FLT PET

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Area of Science:

Oncology
Nuclear Medicine
Thoracic Surgery

Background:

18F-fluorothymidine (FLT) Positron Emission Tomography (PET) is utilized for assessing cell proliferation.
Distinguishing malignant from benign breast lesions is crucial for patient management.
Mediastinal masses require accurate diagnostic approaches.

Observation:

A 48-year-old woman with equivocal bilateral breast lesions underwent an 18F-FLT PET scan.
No FLT-avid breast lesions were detected.
An intensely FLT-avid lesion was incidentally found in the right anterior mediastinum.

Findings:

The mediastinal lesion showed only mild 18F-fluorodeoxyglucose (FDG) uptake on a subsequent PET scan.
Video-assisted thoracic surgery thymectomy was performed.
Histopathological analysis confirmed invasive thymoma.

Implications:

18F-FLT PET imaging can incidentally detect thymoma, even when used for other indications.
The distinct uptake patterns of FLT and FDG may aid in diagnosing thymoma.
This case underscores the value of comprehensive PET imaging in unexpected findings.