[The 478 th case: multiple myalgia with intramuscular nodules]

A 28-year-old man was admitted to the first medical center of Chinese People's Liberation Army General Hospital because of multiple myalgia and intramuscular nodules for more than 2 months. The patient complained of dysphagia, fever and weight loss 2 months ago. Magnetic resonance imaging and biopsy revealed nodular fasciitis. Inflammatory indicators including C-reactive protein, erythrocyte sedimentation rate, platelet count and fibrinogen were slightly elevated. Urine occult blood was positive. Abdominal ultrasound revealed left hydronephrosis. Because nodular fasciitis could not explain the whole situation, a needle biopsy of intramuscular nodules was performed. Pathological examination revealed intramuscular metastatic adenocarcinoma with poor differentiation. Gastric endoscope and positron emission tomography-computed tomography confirmed the diagnosis of advanced gastric adenocarcinoma with extensive metastases of esophagus, lymph nodes, muscles, ureter and bone. Although chemotherapy was given, the patient died of disease progression six months later.

患者男性，28岁。因多发肌肉疼痛伴肌内结节2月余入院。患者吞咽困难、发热、消瘦，外院病理及磁共振成像均提示结节性筋膜炎可能。入院后查C反应蛋白11 mg/L，红细胞沉降率24 mm/1h，血小板计数388×10(9)/L，血浆纤维蛋白原4.59 g/L，尿潜血阳性，腹部超声示左肾积水。考虑结节性筋膜炎不能解释疾病全貌，再次行肌内结节穿刺活检，病理及免疫组化提示肌间转移性低分化腺癌。患者至肿瘤医院完善胃镜及正电子发射断层成像检查，最终诊断为胃低分化腺癌Ⅳ期（食管、淋巴结、肌肉、输尿管、骨多发转移），接受化疗，半年后死亡。.

Keywords: Intramuscular nodules; Myalgia; Neoplasm metastasis; Stomach neoplasms.