Win Aung Zaw, Aparici Carina Mari
Department of Radiology, San Francisco VA Medical Center, San Francisco, California, USA.
Department of Radiology, University California San Francisco (UCSF), San Francisco, California, USA.
J Clin Imaging Sci. 2015 Apr 30;5:22. doi: 10.4103/2156-7514.156125. eCollection 2015.
Squamous cell carcinoma (SCC) of the rectum is extremely rare with a reported incidence of only 0.025-0.1% of all colorectal tumors. The patient was a 68-year-old man who presented with fatigue, dry cough, shortness of breath, and unintentional weight loss. A chest CT revealed a left suprahilar mass suspected to be lung cancer and an initial diagnosis of primary lung cancer was made. However, fluorodeoxyglucose positron emission tomography and computed tomography (FDG-PET/CT) exam revealed an intensely hypermetabolic rectal mass which turned out to be rectal squamous cell carcinoma. This is the first report that shows FDG-PET/CT images of rectal squamous cell carcinoma metastasis to the skin, muscle, bone, and lung. Use of PET/CT in the initial diagnosis of non-resectable rectal cancers may avoid unnecessary surgery.
直肠鳞状细胞癌（SCC）极为罕见，据报道其发病率仅占所有结直肠肿瘤的0.025 - 0.1%。该患者为一名68岁男性，表现为疲劳、干咳、气短和非故意体重减轻。胸部CT显示左肺门上方有一肿块，怀疑为肺癌，初步诊断为原发性肺癌。然而，氟脱氧葡萄糖正电子发射断层扫描和计算机断层扫描（FDG-PET/CT）检查发现直肠有一高代谢肿块，结果为直肠鳞状细胞癌。这是首份展示直肠鳞状细胞癌转移至皮肤、肌肉、骨骼和肺部的FDG-PET/CT图像的报告。PET/CT用于不可切除直肠癌的初始诊断可能避免不必要的手术。
