Chondromyxoid Fibroma with Secondary Aneurysmal Bone Cyst of the Rib

Abstract

2) To the best of my knowledge, there is no report of CMF with secondary ABC of the rib. Case ReportThe patient was a 25-year-old man who presented at the hospital with a 1-year history of left upper back pain. Routine roentgenography revealed an 8-cm mass in the left upper lung field. Computed tomography (CT) revealed a plain boundary multicystic tumor, 75 × 72 mm in size, on the posterior mediastinum with partition structure and calcification near the edge. Bone destruction was observed in the fourth left rib. Invasion into the surrounding tissue or the pulmonary parenchyma was not observed (Fig. 1A-1C). Low signal intensity was observed on T1-weighted magnetic resonance imaging (MRI) scans, whereas high signal intensity was observed on gadolinium-enhanced T2-weighted images ( Fig. 2A-2C). Positron emission tomography (PET) revealed abnormal accumulation (standardized uptake value [SUVmax] = 3.4 >2.5) within the tumor. No tumor markers (CEA, CA19-9, AFP, NSE, and HCGβ) were elevated.The possibility of a posterior mediastinal tumor, lung