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proliferating multilocular thymic cyst

Friday 29 December 2017

Definition: Proliferating multilocular thymic cyst resembles cutaneous proliferating epidermoid cyst and proliferating trichilemmal cyst.

Microscopy

- Pseudoepitheliomatous hyperplasia of cyst lining cells (narrow tongues of squamoid epithelium extending deeply into fibrous cyst wall)
- reactive changes
- no dysplasia
- typical mitotic figures are present.

See also

- thymic cysts