Fig. 4
From: Primary thymus tumors: retrospective case analysis at a reference center in Latin America, 2011–2019
a, b, c Chest CT scan showing a mass of 5 × 4.5 × 5.4 cm, heterogeneous, located in the anterior mediastinum that produces posterior displacement of the right atrium, with areas than enhance with contrast and others with a necrotic aspect. d, e h&e staining, magnification at 2x and 10x, showing a lesion consisting of a mixture of 2 populations: large cohesive cells with vesicular nuclei and small and uniform cells, lymphoid in appearance, with areas that resemble the normal functioning thymus and others similar to the medullary region. Large cells are oval with a pale rounded nucleus and small nucleolus and are inconspicuously distributed among a population of lymphocytes. The lesions form large nodules separated by thick fibrous septa and is surrounded by a collagen capsule. The lesion does not exceed the capsule. Diagnosis of type B1 thymoma