Medical Definition of Carcinoma in situ
Carcinoma in situ: Cancer that has stayed in the place where it began and has not spread to neighboring tissues (for example, squamous cell carcinoma in situ).
Source: MedTerms™ Medical Dictionaryhttp://www.medicinenet.com/script/main/art.asp?articlekey=2627
Last Editorial Review: 1/24/2017
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