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Updated: Sep 18, 2025

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18 F-FDG PET/CT of Sacrococcygeal Pilonidal Sinus Carcinoma
Mali Wang1, Junhui Zhu, Jing Wang
1Department of Nuclear Medicine, The First People's Hospital of Kunshan, Jiangsu University, Kunshan, China.
Abstract:
Pilonidal sinus carcinoma is rare, with a poor prognosis, often misinterpreted as infection or perianal fistula. We present 18 F-FDG PET/CT imaging in a 69-year-old woman with a chronic pilonidal sinus that progressed to an abscess and drained spontaneously. The retrorectal-precoccyx irregular mass with sinus tract formation and apparent glucose metabolism, connecting with an intergluteal cyst, was confirmed pathologically as pilonidal sinus carcinoma.
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