Abstract

SAN ROMAN, J  and  HOVSEPIAN, M. Unsuspected muscle metastases detected with 18F-FDG PET/CT Abstract. Rev. argent. radiol. [online]. 2017, vol.81, n.1, pp.12-16. ISSN 1852-9992.  http://dx.doi.org/10.1016/j-rard.2017.01.003.

Objective: To assess the prevalence of unsuspected muscle metastases (MM) in patients with known malignant disease, examined with 18F-fuorodeoxyglucose positron emission tomography integrated with computed tomography (18F-FDG PET/CT). Materials and methods: A total of 2,953 18F-FDG PET/CT examinations were retrospectively analysed, looking for cases with MM. Primary neoplasm, number and location of MM and SUV max were recorded on each patient. Oncology patients with known histology and multiple secondary lesions were included. The 18F-FDG PET/CT was the reference method for detection of metastases. Results: MM were observed in 33 patients (prevalence: 1.12%) aged between 18 and 88 years. The primary tumours included: kidney in 7 cases, breast in 5, melanoma in 4, lung in 3, ovary in 3, thyroid in 3, sarcomas in 3, colorectal in 2, bladder in 2, and endometrial in 1. A total of 96 MM were observed in 33 patients, and located in: thigh muscles 24, gluteal 15, chest wall 13, iliopsoas 10, paravertebral muscles 10, abdominal wall 7, leg 7, arm 4, and other locations 6 (pelvis, neck, etc.). MM affected only one muscle in 22/33 patients and several muscles in 11/33. Hypermetabolic focus was the most frequent uptake pattern, with SUV max between 1.5 and 34. Discussion: Our series has a significant number of cases, and is consistent with other authors on the incidence and location of MM. Conclusion: MM are uncommon and may be overlooked. MM may be detected with 18F-FDG PET/CT as single or multiple hypermetabolic foci.

Keywords : Fluorodeoxyglucose F 18; Muscle métastases; Positron emission tomography integrated with computed tomography.

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