Updated January 21, 2012.

Definition: In situ is latin for "in the place".

In medicine, in situ specifically means that something has not moved, or been moved. For example, "carcinoma in situ" means that cancer is present, but has not moved from the original site (metastasized).

Pronunciation: In-Sigh-Too

Also Known As: in place, in the place, not moved, original location, not metastasized.

Common Misspellings: Insitu, insightu, incitu, in sightu, in citu, en citu, insito,

Examples:

The surgeon said that the MRI and CT scan were not telling him what he needed to know, therefore, he needed to operate and see the tissue in situ.