PMC2811301_01
Chest radiograph of the patient taken during an annual checkup (A) and coronal and transverse views of contrast enhanced computed tomographic (CT) images (B, C). A diaphragm-based mass (arrow) was observed on the chest radiograph (A). The homogeneously enhanced mass (arrow) abuts the left lateral segment of the liver and stomach (B, C). No spleen was detected in the left upper abdominal cavity (B, C).
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F1
In 2007, the lesion had enlarged and formed a sizable mass, suggesting a malignancy (Fig. 1A). Computed tomography (CT) revealed a homogeneously well-enhanced multinodular mass, measuring 4.8 cm in its greatest dimension, based on the diaphragm (Fig. 1B, C).
Microscopic findings of the thoracic splenosis on frozen (A) and permanent (B-D) sections. Examination of the frozen section showed a thick capsule and trabeculae with abundant lymphoid tissue, but white and red pulp were indistinct (H&E stain, x40) (A). The splenic tissue is tightly attached to the lung parenchyma without invasion (H&E stain, x40) (B) and have normal splenic histology, with thick capsule and distinct white and red pulp (H&E stain, x100 and x200) (C, D).
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F2
A piece of soft tissue labeled "diaphragm" was submitted for a frozen section, which revealed a multinodular solid mass containing abundant lymphoid cells in a diffuse or vaguely nodular arrangement, as well as a thick fibrous capsule and septae, suggesting it may be a low grade malignant lymphoma (Fig. 2A). Examination of a permanent section showed that the mass was ectopic splenic tissue, which included white and red pulp and central arteries (Fig. 2B-D).