Topanga, played by Danielle Fishel, was diagnosed with ductal carcinoma in situ (DCIS), which is a type of breast cancer. It is considered a very early stage of breast cancer, technically stage 0. DCIS is a form of non-invasive breast cancer where the cancer cells are confined to the milk ducts and have not spread to surrounding breast tissue. However, in Danielle Fishel's case, it was described as "high-grade DCIS with microinvasion," meaning some cancer cells had begun to invade nearby tissue, which can classify it closer to stage
- She underwent surgery and follow-up treatments to address the condition. DCIS is one of the earliest and most treatable forms of breast cancer, emphasizing the importance of early detection through mammograms.
