What is 'Carcinoma in situ' (CIS)?
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Correct answer: Malignant cells confined within the basement membrane
CIS represents a pre-invasive stage of malignancy where cells show all the cytological features of cancer but remain confined by the basement membrane. Once the basement membrane is penetrated, it is classified as invasive carcinoma.
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More Benign and Malignant Tumors questions
- Which of the following tumors is benign despite its name suffix?
- The presence of 'tripolar' or 'star-shaped' mitotic figures on a biopsy is most suggestive of:
- Which of the following describes a 'Chistoma' (or Choristoma)?
- What is the primary difference between 'grading' and 'staging' of a malignant tumor?
- Which malignant tumor is the classic exception to the rule that carcinomas spread via lymphatics?
- What is the characteristic feature of a 'Teratoma'?