System: Musculoskeletal / Chest Wall Exam Focus: High-Yield Imaging Review Key Imaging Pattern: Deep infrascapular mass with interwoven fat streaks and muscle-like soft tissue on CT 1-Clinical Vignette A 54-year-old man presents with swelling beneath the right scapula and a catching or snapping sensation during arm movements. 2. Board-Style Question Which diagnosis best explains the location and internal architecture of this lesion? A. Lipoma B. Desmoid-type fibromatosis C. E

In daily radiological practice, the posterior-anterior (PA) chest radiograph is a fundamental diagnostic tool. While primarily utilized to evaluate the pulmonary parenchyma, a systematic approach to the "bone window" can uncover crucial anatomical variations. In this clinical article, we review a T1 vertebra posterior element fusion defect (Spina Bifida Occulta) incidentally identified during a routine pre-employment / military health board examination. 1. Fundamental Concept