Additional information: A surgery was performed and yielded a 9.5 x 6.5 x 5.5 cm encapsulated mass with attached soft tissue that appeared to be thymic tissue on subsequent  microscopic examination. The mass had a gray-yellow, solid cut surface with multifocal hemorrhage and necrosis. The capsule was largely intact with no macroscopic evidence of penetration identified. The following pictures are taken from the surgical specimens.

F.	G.	H.	I.	J.	K.
L.	M. PAS

PAS: Periodic acid Schiff reaction.