A Rare Case of Spindle Cell Rhabdomyosarcoma of the Diaphragm in Adult with Thoracoabdominal Extension.

Rhabdomyosarcoma (RMS) is an uncommon malignant soft-tissue tumor, with diaphragmatic spindle cell RMS being extremely rare in adults. A 41-year-old male patient had progressive breathlessness and right-sided pleuritic chest pain. Imaging and biopsy that includes X-ray, computed tomography, magnetic resonance imaging, histopathology, and immunohistochemistry established a large thoracoabdominal spindle cell RMS. Early diagnosis, careful imaging, and combined treatment were important, and they helped increase knowledge of this unusual entity.