The TNM (Tumor size, Node (lymph) & Metastases) classification is not used for brain tumors for:
Most patients with CNS tumors develop metastatic disease
Brain tumors are more deadly
Tumor size is less relevant than the location and histology
Brain tumors have poor prognosis
The Correct Answer is C
Choice A reason: Most patients with CNS tumors do not develop metastatic disease. Central nervous system (CNS) tumors, including brain tumors, typically do not metastasize outside the CNS. Instead, they grow and exert pressure on adjacent brain structures, leading to neurological symptoms.
Choice B reason: While brain tumors can be very deadly, the TNM classification system is not avoided due to the lethality of the tumors. The main reason for not using the TNM system is because the classification criteria do not align well with the unique aspects of brain tumors.
Choice C reason: Tumor size is less relevant than the location and histology for brain tumors. The location of the tumor within the brain and its histological characteristics (e.g., type, grade, and molecular features) are more critical for prognosis and treatment planning. Brain tumors can cause significant clinical issues even when small, depending on their location.
Choice D reason: Brain tumors can have a poor prognosis, but this is not the reason the TNM classification is not used. The classification system's limitation is primarily due to the fact that brain tumors' behavior and treatment considerations depend more on their location and histological features than on tumor size, nodal involvement, and metastasis, which are the focus of the TNM system.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A reason: Fasting blood glucose measures the blood sugar level after an individual has not eaten for at least 8 hours. While it provides a snapshot of current blood glucose levels, it does not reflect long-term blood glucose control.
Choice B reason: Urinalysis can detect the presence of glucose or ketones in the urine, which can indicate poor blood glucose control. However, it does not provide a direct measure of blood glucose levels over time and is not the best predictor of long-term control.
Choice C reason: Feasting (postprandial) blood glucose measures blood sugar levels after eating. It can indicate how well the body manages glucose after a meal but does not provide information about overall blood glucose control over the previous few months.
Choice D reason: Hemoglobin A1C, also known as HbA1c, measures the percentage of glycated hemoglobin in the blood. It reflects the average blood glucose levels over the past 2-3 months. This test is considered the best predictor of long-term blood glucose control because it provides a comprehensive view of blood sugar management over an extended period. The normal range for HbA1c is typically below 5.7% for individuals without diabetes.
Correct Answer is ["A","B","D"]
Explanation
Choice A reason: Gestational diabetes is indeed due to insulin resistance. During pregnancy, hormonal changes can cause the body's cells to become less responsive to insulin, leading to higher blood glucose levels.
Choice B reason: In gestational diabetes, the pancreas is unable to produce enough insulin to overcome the insulin resistance caused by pregnancy hormones. This insufficient insulin production leads to elevated blood glucose levels.
Choice C reason: Gestational diabetes is not permanent. It specifically occurs during pregnancy and usually resolves after the baby is born. However, women who have had gestational diabetes are at an increased risk of developing type 2 diabetes later in life.
Choice D reason: Gestational diabetes occurs during pregnancy. It is diagnosed when blood glucose levels are elevated in a pregnant woman who did not have diabetes before pregnancy.
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