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Recurrent Subcutaneous Ewing Sarcoma on 18F-FDG PET/CT.

Junhao Wu¹, Ya Liu, Weidong Gong

¹From the Department of Nuclear Medicine, The Affiliated Hospital of Southwest Medical University; Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province; and Academician (Expert) Workstation of Sichuan Province, Luzhou, Sichuan, China.

Clinical Nuclear Medicine

|August 10, 2021

Summary

Recurrent subcutaneous Ewing sarcoma, a rare condition, was suspected in a 23-year-old woman. Imaging confirmed an FDG-avid mass, later diagnosed as subcutaneous Ewing sarcoma.

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Area of Science:

Oncology
Radiology

Background:

Subcutaneous Ewing sarcoma is an exceptionally rare variant of Ewing sarcoma.
Early diagnosis and management are crucial for rare soft tissue tumors.

Observation:

A 23-year-old woman with a history of primary subcutaneous Ewing sarcoma presented with a new, growing mass.
18F-FDG PET/CT imaging revealed a hypermetabolic lesion in the buttock region.

Findings:

The mass demonstrated significant uptake of 18F-FDG, indicating high metabolic activity.
Histopathological and immunohistochemical analyses confirmed the recurrence of subcutaneous Ewing sarcoma.

Implications:

This case highlights the utility of 18F-FDG PET/CT in diagnosing recurrent subcutaneous Ewing sarcoma.
Accurate diagnosis is essential for appropriate treatment planning in rare oncological presentations.