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Cystic disease/congenital anomalies

Mesenchymal cystic hamartoma

Reviewers: Elliot Weisenberg, M.D. (see Reviewers page)
Revised: 25 August 2011, last major update August 2011
Copyright: (c) 2003-2011, PathologyOutlines.com, Inc.


● Bilateral multifocal cysts lined by normal or metaplastic respiratory epithelium resting on a cambium layer of mesenchymal cells
● Rare
● Lesion is initially solid, but becomes cystic when approximately 1 cm in diameter
● Slow growing
● Associated with pneumothorax (Can Respir J 2003;10:280)
● Generally follows an indolent course
● In females, metastatic low-grade endometrial stromal sarcoma must be excluded

Gross images

Tumor of chest wall

End of Lung-nontumor > Cystic disease/congenital anomalies > Mesenchymal cystic hamartoma

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