PMC9852708_01
(A) CT revealed a mass on the right side of the upper and posterior mediastinum and the adjacent trachea and esophagus were pushed. ((B) Transverse, (C) sagittal, (D) Coronal) contrast-enhanced CT scan showed an unobvious enhanced mass with clear tumor boundaries.
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F1
Chest CT showed that the right side of the upper and posterior mediastinum could be seen as a round and slightly low-density shadow with a clear boundary, the size of the lesion was about 30.6 mm * 25.1 mm, the CT value was about 27.0 HU, and the adjacent trachea and esophagus were pushed (Figure 1A). Contrast-enhanced CT showed an unobvious enhanced mass with clear tumor boundaries (Figure 1B-D).
(A) Hematoxylin-eosin staining showed the fibrous cyst wall lined with squamous epithelium and cuboidal epithelium, with hyperplasia of lymphoid tissue and formation of lymphoid follicles.(x100) (B) x40.
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F2
Postoperative pathology examination showed the fibrous cyst wall lined with squamous epithelium and cuboidal epithelium, with hyperplasia of lymphoid tissue and formation of lymphoid follicles, consistent with branchial cysts (Figures 2A,B).
Timeline of investigation, treatment and follow-up.
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F3
One year after surgery, no significant recurrence was found when the patient was reexamined (Timeline in Figure 3).