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Federico Caobelli,Sara Vincenzina Gabanelli,Antonio Brucato,Claudio Pizzocaro,Alberto Soffientini,Raffaele Giubbini,Ugo Paolo Guerra 대한핵의학회 2013 핵의학 분자영상 Vol.47 No.3
Sarcoidosis is a systemic chronic inflammatory disease of unknown aetiology, characterised by granulomatous lesions with heterogeneous clinical manifestations affecting multiple organs and tissues. Although the respiratory system is most commonly affected, the disease may also present with bone lesions. We report the case of a 31-yearold woman who presented with low back pain and no history of cancer and who was found to have suspicious lesions involving the entire spine on magnetic resonance imaging (MRI). The patient underwent 18F-fluorodeoxyglucose (FDG) PET/CT to search for a primary tumour and for staging purposes. 18F-FDG PET/CT revealed a pattern of hypermetabolic activity in widespread skeletal lesions and in a single left cervical lymph node. The primary tumour was not found, thus suggesting a haematologic disorder. Subsequent biopsies of a cervical lymph node and of bone tissue from L4revealed active sarcoidosis with no evidence of cancer. This underlines the importance of considering all alternatives when hypermetabolic lesions are found on 18F-FDG PET/CT. Furthermore, 18F-FDG PET can be very useful to indicate accessible sites for guiding fine-needle aspiration cytology (FNAC).
Cantalamessa, Antonio,Caobelli, Federico,Paghera, Barbara,Caobelli, Antonio,Vavassori, Francesca The Korea Society of Nuclear Medicine 2011 핵의학 분자영상 Vol.45 No.2
Purpose Pheochromocytoma (PH) is a rare catecholaminesecreting tumor that arises from chromaffin tissue within the adrenal medulla and extra-adrenal sites; commonly it is sporadic, and malignant PH accounts for about 10% of all cases. Several imaging modalities have been used for the diagnosis and staging of this tumor: functional imaging using radio-labelled metaiodobenzylguanidine and, more recently, $^{18}F$-fluorodeoxyglucose positron emission tomography ($^{18}F$-FDG PET/CT), which offers substantial sensitivity and specificity to correctly detect metastatic PH and helps to identify patients suitable for treatment with radiopharmaceuticals. The aim of our study was to compare CT, $^{18}F$-FDG PET/CT, and $^{123}I$-metaiodobenzylguanidine single photon emission tomography ($^{123}I$-MIBG SPECT) as feasible methods to restage patients diagnosed histologically with PH. Methods We retrospectively evaluated 38 patients (27 females and 11 males; mean age: $44{\pm}15$ years) with malignant PH documented histologically after surgical intervention. These patients underwent CT, $^{18}F$-FDG PET/CT, and $^{123}I$-MIBG SPECT. Results $^{18}F$-FDG PET/CT showed positive results for neoplastic tissue in 33/38 patients (86.8%) and negative in 5/38 (13.2%), in concordance with CT alone. $^{123}I$-MIBG SPECT was positive in 30/38 patients (78,9%) and negative in 8/38 (21.1%). No differences in lesion numbers were found between $^{18}F$-FDG PET/CT and CT, whereas a difference could be demonstrated between $^{18}F$-FDG PET/CT and $^{123}I$-MIBG SPECT. Conclusion $^{18}F$-FDG PET/CT could more accurately restage patients with PH than CT and $^{123}I$-MIBG SPECT, also in the absence of a staging study.