What is the correct answer for Q1 in the Scientific Committee Med222 Answers sheet? A) A B) B C) C D) D E) E
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What is the answer to Q1 in the Scientific Committee Med222?
C
What is the answer to Q2 in the Scientific Committee Med222?
B
What characterizes Carcinoma In Situ?
Entire epithelial thickness shows dysplasia, and the basement membrane is intact.
What is the first step of metastasis?
Cancer cells invade the basement membrane.
What is the process that leads to the formation of a neoplasm (tumor)?
Any cell can be transformed, leading to growth and then a neoplasm.
What is a reliable feature of malignancy?
Invasion of the basement membrane.
How are tumors classified?
By cell of origin, behavior (benign or malignant), appearance, and degree of differentiation.
What is required for excision of malignant tumors?
Excision by wide margin.
What is a characteristic of malignant cells related to nuclear-to-cytoplasmic ratio?
They have a large nuclear-to-cytoplasmic ratio.
What does 'cell of origin' refer to in tumor classification?
It refers to where the tumor arises from, such as epithelial or connective tissue.
What does metastasis refer to?
Spread of malignant tumors to distant sites not contiguous with the main tumor.
What type of mitosis is often observed in malignant cells?
Abnormal mitosis, such as tri- and quadripolar mitosis.
What are the degrees of differentiation in tumors?
Which tumors do not metastasize?
Basal cell carcinoma and glial tumors.
What feature is prominent in the nuclei of malignant cells?
Prominent nucleoli.
How are benign tumors named?
By the tissue of origin with the suffix –oma, e.g., fibroma, lipoma.
What is a key characteristic of benign tumors regarding differentiation?
Well differentiated.
What must happen before metastasis occurs?
Invasion must happen.
How does the rate of growth differ between benign and malignant tumors?
Benign tumors usually grow slowly, while malignant tumors grow rapidly.
What is an exception to the benign tumor nomenclature?
Granuloma and lymphoma, which do not follow the typical naming convention.
How do benign tumors typically grow?
Slow growth and expansile, not invasive.
What is the definition of a neoplasm?
A new growth of cells or an abnormal mass of tissue that exceeds and is uncoordinated with normal tissue growth, persisting after the cessation of growth stimuli.
Do malignant tumors invade adjacent tissue?
Yes, they invade adjacent tissue but do not metastasize.
Can benign tumors ever grow rapidly?
Yes, some benign tumors may grow rapidly.
What suffix is used for malignant tumors of epithelial origin?
Carcinoma.
What is a characteristic of malignant tumors in terms of growth?
Rapid growth with progressive infiltration and invasion.
What is a key difference in local invasion between benign and malignant tumors?
Benign tumors often have a capsule and limited growth, while malignant tumors invade and destroy surrounding tissue.
What is the difference in recurrence between benign and malignant tumors after removal?
Benign tumors rarely come back after removal, while malignant tumors may recur.
What type of cell shape is associated with malignant tumors?
Pleomorphic with variable degrees of differentiation.
What is the role of the capsule in benign tumors?
The capsule surrounds the tumor with fibrous tissue, limiting growth and preventing local invasion.
What does differentiation indicate in tumor cells?
The degree of resemblance of the tumor cell to its cell of origin, functionally and morphologically.
What is the significance of knowing a tumor's cell of origin and behavior?
It is important for the identification and naming of the tumor.
What distinguishes a benign neoplasm from a malignant neoplasm?
A benign neoplasm is limited new growth without invasion or spread, while a malignant neoplasm involves invasive growth that also spreads.
Do benign tumors have a fibrous capsule?
Yes.
What is the significance of in situ carcinoma?
It is a pre-stage of invasion.
How are benign tumors characterized in terms of differentiation?
Benign tumors are similar to the cell of origin and can be well, moderately, or undifferentiated.
What is the origin of malignant connective tissue tumors?
Sarcoma.
What is the general term for all malignant growths?
Cancer.
What is the first step of metastasis?
C/ Invasion.
What is anaplasia?
A condition where cells are undifferentiated and may appear immature.
What is oncology?
The study of neoplasia in all its aspects.
What suffix is commonly used for benign tumors?
–oma.
Do basal cell carcinoma tumors invade nearby tissue?
A/ True.
What is dysplasia characterized by?
Loss of uniformity of individual cells and their architectural orientation.
Why is cancer considered a genetic disorder?
Because it is caused by DNA mutations, which are mostly acquired spontaneously or induced by environmental insults.
What are examples of malignant connective tissue tumors?
Osteosarcoma, liposarcoma, angiosarcoma, leiomyosarcoma, rhabdomyosarcoma.
What is a characteristic of malignant tumors regarding nuclear chromatin?
Increased, hyperchromatic nuclear chromatin.
What are some features of dysplasia?
Increased nuclear size, variation in nuclear and cell size (pleomorphism), loss of differentiating features, and increased nuclear DNA content (hyperchromatism).
What happens to tissues affected by malignant neoplasms?
They can invade and destroy tissues, using tissue nutrients and leading to tissue necrosis.
What is a teratoma?
A tumor of germ cell origin that may be benign or malignant, usually located in the ovary or testes.
How do malignant tumors differ in terms of nucleoli?
Prominent and irregular shape.
What does hyperchromatism indicate?
Increased DNA content in the nucleus, making it appear darker.
What is the difference between a tumor and a neoplasm?
Tumor may be used instead of neoplasm but is not accurate; neoplasm specifically refers to abnormal growth.
What does the term 'blastoma' refer to?
Tumors of primitive fetal origin, such as retinoblastoma, nephroblastoma, neuroblastoma, and hepatoblastoma.
What is the recurrence rate of malignant tumors compared to benign tumors?
Malignant tumors often recur, while benign tumors rarely do.
How do normal cells and benign neoplasms differ from malignant cells in terms of morphology?
Normal cells and benign neoplasms are monomorphic, while malignant cells are pleomorphic.
What is dysplasia?
An abnormal development or growth of tissues, organs, or cells.
What is anaplasia?
A condition where there is no similarity in growth between the new tissue and the tissue of origin.
What are the nuclear characteristics of benign tumors?
Nuclei are small and normochromatic with fewer mutations.
What is anaplasia?
A reversion of cells to a more primitive or undifferentiated state.
How do benign and malignant tumors differ in terms of local invasion?
Malignant tumors invade locally, while benign tumors do not.
What are the nuclear characteristics of malignant tumors?
Nuclei are large and hyperchromatic with more mutations.
What is the significance of the term 'in situ carcinoma'?
It refers to cancer that is localized and has not invaded surrounding tissues.
What is a key characteristic of malignant tumors regarding metastasis?
Malignant tumors can metastasize to distant sites.
What does 'invasive carcinoma' mean?
It refers to cancer that has spread beyond its original site into surrounding tissues.
What is the typical occurrence of blastomas?
The majority occur in infants and children.
