Huge Intrathoracic Lipoma Occupying the Right Hemithorax

Intrathoracic lipomas are rare benign tumours that may attain considerable size before detection. We report a 38-year-old woman in whom a huge intrathoracic lipoma was incidentally identified on chest radiography during preoperative assessment. Computed tomography demonstrated a large, well-circumscribed fat-attenuation lesion occupying nearly the entire right hemithorax, causing near-total lung collapse and mediastinal shift. Image-guided biopsy confirmed a benign lipoma. This case highlights the characteristic imaging features of intrathoracic lipoma and underscores the importance of histopathological confirmation to exclude liposarcoma, even in asymptomatic patients with marked thoracic compression.