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The Mouse Adult Gross Anatomy Ontology and Mammalian Phenotype Ontology are downloaded weekly from the Mouse Genome Informatics databases at Jackson Laboratories ( For more information about these ontologies, see the MGI Publications Page at

Term:thymus cyst
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Accession:MP:0014130 term browser browse the term
Definition:presence of one or more fluid-filled spaces lined by epithelium within the thymus
Comment:Thymic cysts are rare mediastinal lesions and are thought to result from the congenital persistence of thymopharyngeal tracts and acquired, progressive cystic degeneration of thymic (Hassall) corpuscles and epithelial reticulum of the thymus; congenital cysts are unilocular, whereas acquired cysts are usually multilocular and result as a consequence of inflammatory processes.
Synonyms:exact_synonym: cystic thymus;   thymic cyst;   thymic cysts;   thymus cysts

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  mammalian phenotype 5374
    growth/size/body region phenotype 811
      abnormal cyst 8
        thymus cyst 0
Path 2
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  mammalian phenotype 5374
    immune system phenotype 492
      abnormal immune system morphology 187
        abnormal immune system organ morphology 73
          abnormal thymus morphology 61
            thymus cyst 0
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