Which type of cancer diagnosis does NOT require a synoptic pathology report?

A synoptic pathology report is a standardized format designed to ensure completeness and consistency in the reporting of cancer diagnoses. It is particularly essential for various types of cancers where detailed pathology information is critical for treatment planning and outcomes assessment.

In the context of the question, carcinoma in situ (CIS) typically refers to localized cancer that has not spread beyond the site of origin. It is usually less complicated in terms of staging and treatment compared to invasive cancers. As such, the reporting requirements can be less stringent for CIS, aligning with the reasoning that a synoptic pathology report may not be mandatory for these cases.

Conversely, invasive cancers and even ductal carcinoma in situ (DCIS) typically necessitate a comprehensive synoptic report because detailed information about the tumor's characteristics, margins, and other pathological features is crucial for establishing the appropriate treatment protocol and ensuring proper patient management.

Thus, the focus on the nature of carcinoma in situ, recognized for its relatively straightforward pathology, helps clarify why this type of diagnosis may not require a synoptic pathology report compared to more complex invasive cancers.