Department of Orthopaedic Surgery, Faculty of Medicine, Fukuoka University, 7-45-1 Nanakuma, Jonan-ku, Fukuoka, 814-0180, Japan.
World J Surg Oncol. 2012 Jun 30;10:132. doi: 10.1186/1477-7819-10-132.
Intramuscular myxoma is a rare benign soft tissue tumor which may be mistaken for other benign and low-grade malignant myxoid neoplasms. We present the case of a 63-year-old woman with an asymptomatic intramuscular myxoma discovered incidentally on a whole-body F-18 fluorodeoxyglucose (FDG) positron emission tomography (PET)/computed tomography. PET images showed a mild FDG uptake (maximum standardized uptake value, 1.78) in the left gluteus maximus. Subsequent magnetic resonance (MR) imaging revealed a well-defined ovoid mass with homogenous low signal intensity on T1-weighted sequences and markedly high signal intensity on T2-weighted sequences. Contrast-enhanced MR images showed heterogeneous enhancement throughout the mass. The diagnosis of intramuscular myxoma was confirmed on histopathology after surgical excision of the tumor. The patient had no local recurrence at one year follow-up. Our case suggests that intramuscular myxoma should be considered in the differential diagnosis of an oval-shaped intramuscular soft tissue mass with a mild FDG uptake.
肌肉内黏液瘤是一种罕见的良性软组织肿瘤，可能被误诊为其他良性和低度恶性黏液样肿瘤。我们报告 1 例 63 岁女性患者，因全身 F-18 氟脱氧葡萄糖（FDG）正电子发射断层扫描（PET）/计算机断层扫描偶然发现无症状的肌肉内黏液瘤。PET 图像显示左臀肌有轻度 FDG 摄取（最大标准化摄取值，1.78）。随后的磁共振（MR）成像显示边界清楚的卵圆形肿块，T1 加权序列呈均匀低信号强度，T2 加权序列呈明显高信号强度。增强磁共振图像显示肿块内不均匀强化。肿瘤切除后的组织病理学检查证实为肌肉内黏液瘤。患者在 1 年随访时无局部复发。我们的病例提示，对于卵圆形、肌肉内软组织肿块，伴轻度 FDG 摄取，应考虑肌肉内黏液瘤的鉴别诊断。
