Diffuse bone marrow uptake related to granulocyte colony-stimulating factor-producing maxillary sinus carcinoma on 4-borono-2-<sup>18</sup>F-fluoro-L-phenylalanine positron emission tomography/computed tomography Kusumahstuti KP, Watabe T, Kitamura N, Yamamoto T, - J Indian Prosthodont Soc

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CASE REPORT

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Diffuse bone marrow uptake related to granulocyte colony-stimulating factor-producing maxillary sinus carcinoma on 4-borono-2-¹⁸F-fluoro-L-phenylalanine positron emission tomography/computed tomography Kharisma Perdani Kusumahstuti¹, Tadashi Watabe², Naoya Kitamura³, Tetsuya Yamamoto³ ¹ Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University, Osaka, Japan; Department of Nuclear Medicine and Molecular Imaging, Universitas Padjadjaran, General Hasan Sadikin Hospital, Bandung, Indonesia ² Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine; Institute for Radiation Sciences, Osaka University, Suita, Osaka, Japan ³ Department of Oral and Maxillofacial Surgery, Kochi Medical School, Kochi University, Nangoku, Kochi, Japan Correspondence Address: Tadashi Watabe, Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University, 2-2 Yamadaoka, Suita, Osaka 565-0871 Japan Source of Support: None, Conflict of Interest: None DOI: 10.4103/wjnm.WJNM_80_20

Granulocyte colony-stimulating factor (G-CSF) can be produced by tumor cells and is known to promote tumor growth, thereby potentially accelerating disease progression. Squamous cell carcinoma (SCC) at maxillary sinus is aggressive growth with poor prognosis. Maxillary sinus carcinomas are rare and can be clinically silent in the early stages or manifest with the same signs and symptoms of more common illnesses, leading to their delayed diagnosis of disease. Hypermetabolic uptake of¹⁸F-fluorodeoxyglucose (¹⁸F-FDG) but not of 4-borono-2-¹⁸F-fluoro-L-phenylalanine (¹⁸F-FBPA), in the bone marrow of patients with G-CSF-producing tumors without bone marrow involvement during positron emission tomography (PET), has been reported. The present case report describes our first experience of bone marrow uptake in PET/computed tomography examination using¹⁸F-FBPA, high uptake seen in the bone marrow of a patient with a G-CSF-secreting SCC of the maxillary sinus that it relapsed following chemoradiation therapy and surgical resection of the tumor.

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    -  Watabe T
    -  Kitamura N
    -  Yamamoto T

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