A rare case of combined small cell lung carcinoma with heterologous component of rhabdomyosarcoma diagnosed by endobronchial ultrasound (EBUS)-guided biopsy oleh Diego Cedano, Jorge Cedano, Daffolyn Rachael Fels Elliott, Jasmeet Assi, Rashna Madan, Stephen Hyter, Lucas R. Pitts, Maykol R. Postigo Jasahui