Clinical information:

       The patient was an 18 year-old man who presented with chest pain and shortness of breath. The pain would last for seconds followed by spontaneous resolution. There was no history of cough, hemoptysis, fever, or chills. A chest x-ray revealed fullness of mediastinum. CT scan revelaed a 7.5 x 6.2 x 9.1 cm mass that extended inferiorly along the left superior aspect of the heart. The mass encroached the main pulmonary trunk. Remnant of tissue consistent with residual thymus were noted. The lung was well areated and free of nodules or consolidation. A CT guided fine needle aspiration (FNA) was performed. The following photos are taken from the FNA.

Pathology of the case: 

A. DiffQuick	B. DiffQuick	C. DiffQuick	D. PAP stain	E. PAP stain

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