Fig. 18.

Thymoma. a) Cell block section of EBUS guided aspiration of a paratrachea lump, revealed matrix-riched and haemorragic background with small-medium sized neoplastic cells in substance organoid formations (magnification x 400, b) the neoplastic groups bordered with thick tissue septae (magnification x 100) and (c) constituted of cells with medium sized cytoplasm and epithelial-like features with small lymphocytes between them (magnification x 600), d) these epithelial-like cells were thymocytes and exhibited positivity for CD 117 and e) CKAE1/AE3 (magnification x 600).