Rapidly Developing Intrathoracic Low-Grade Fibromyxoid Sarcoma: A Case Report

An 84-year-old Japanese woman presented with a right intrathoracic mass which was 8 cm in size. CT-guided needle biopsy did not provide a definitive diagnosis. Perioperatively, a mass was found in the right lower lobe of the lung and was suspected to have invaded the chest wall at the sixth–eighth ribs.