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Chapter 1: Problem 63

Which of the following endocrine abnormalities is not commonly associated with multiple endocrine neoplasia (MEN) type 1 ? a. hyperparathyroidism b. pituitary tumours c. pancreatic islet cell tumours d. pheochromocytoma

Short Answer

Expert verified
Option (d) - pheochromocytoma

Step by step solution

01

Understanding Multiple Endocrine Neoplasia Type 1

Multiple Endocrine Neoplasia (MEN) type 1, also known as Wermer's syndrome, is a hereditary condition characterized by the development of tumors in multiple endocrine glands.
02

Common Glands Affected by MEN Type 1

The three most commonly affected glands in MEN type 1 are the parathyroid glands, the pituitary gland, and the pancreas. This helps us identify which abnormalities are associated with MEN type 1.
03

Evaluating Hyperparathyroidism

Hyperparathyroidism is a condition where the parathyroid glands produce too much parathyroid hormone. This is a common feature in MEN type 1, so option (a) can be associated with MEN type 1.
04

Evaluating Pituitary Tumors

Pituitary tumors are also frequently seen in MEN type 1 patients. This means option (b) is associated with MEN type 1.
05

Evaluating Pancreatic Islet Cell Tumors

Pancreatic islet cell tumors occur in the pancreas and are another common manifestation in MEN type 1. Therefore, option (c) is associated with MEN type 1.
06

Evaluating Pheochromocytoma

Pheochromocytoma is a type of tumor that arises from the adrenal gland, and it is more commonly associated with MEN type 2, not MEN type 1. Therefore, option (d) is not commonly associated with MEN type 1.
07

Conclusion

Since pheochromocytoma is not commonly associated with MEN type 1, the correct answer is option (d).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

hyperparathyroidism
Hyperparathyroidism occurs when the parathyroid glands produce too much parathyroid hormone (PTH). The parathyroid glands, situated near the thyroid, regulate calcium levels in the body. Overproduction of PTH leads to elevated calcium levels in the blood, a condition known as hypercalcemia. Common symptoms include bone pain, kidney stones, excessive urination, and fatigue. In Multiple Endocrine Neoplasia Type 1 (MEN 1), hyperparathyroidism is frequent, as tumors or hyperplasia of the parathyroid glands develop, causing increased PTH.
pituitary tumors
Pituitary tumors are abnormal growths in the pituitary gland, a small gland located at the base of the brain. The pituitary gland produces hormones that influence growth, metabolism, and reproductive functions. Tumors in this gland can affect hormone production, either increasing or decreasing hormone levels. Symptoms vary based on hormone impact but may include headache, vision problems, and hormonal imbalances. In MEN 1, pituitary tumors are common and can result in conditions such as acromegaly (excess growth hormone) or Cushing's disease (excess ACTH production).
pancreatic islet cell tumors
Pancreatic islet cell tumors arise from the hormone-producing cells of the pancreas. These tumors can be functional, producing various hormones like insulin, or non-functional, not producing active hormones. Functional tumors may cause symptoms based on the hormone they secrete, such as low blood sugar in insulin-secreting tumors (insulinomas). Non-functional tumors might go unnoticed until they grow large. In MEN 1, these tumors are frequent and vary widely in their hormonal secretions, leading to diverse clinical presentations.
pheochromocytoma
Pheochromocytoma is a rare tumor of the adrenal glands, which sit atop the kidneys. These tumors produce excess catecholamines, hormones that include adrenaline. Symptoms include high blood pressure, heart palpitations, sweating, and headaches. Although pheochromocytomas are most commonly linked with MEN 2, they are notably absent in MEN 1. This distinction is crucial for differentiating between MEN types, as pheochromocytomas do not typically align with MEN 1鈥檚 profile, making their presence much more indicative of MEN 2.

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Most popular questions from this chapter

Cortisol has only weak mineralocorticoid activity in the kidney because a. it has low affinity for the aldosterone receptor b. it is rapidly converted by an enzyme in the renal cell to inactive cortisone c. it can not enter the renal cell d. it is in too low concentration e. it is very rapidly filtered through the glomerulus and is therefore ineffective.

The best test to assess adrenal reserve in a patient withdrawn from long term glucocorticoid therapy is which of the following? a. morning serum cortisol b. urine free cortisol c. insulin hypoglycemia stimulation test d. ACTH stimulation test e. aldosterone

A serum TSH level five times upper limit of normal in the presence of a low \(\mathrm{T}_{4}\) and low \(\mathrm{T}_{3}\) uptake: a. establishes the thyroid as the cause of hypothyroidism b. rules out the thyroid as the cause of hypothyroidism c. establishes the pituitary as the cause of hypothyroidism d. establishes the diagnosis of secondary hyperthyroidism e. fails to do any of the above

The nitroprusside test used on dipsticks detects: a. beta-hydroxybutyric acid b. creatinine c. glucose d. acetoacetic acid e. blood

A patient presents to the emergency department with profound postural hypotension, hyponatremia, hyperkalemia, and his skin is darker than usual. Which of the following diagnostic tests should be carried out as soon as possible? a. baseline serum cortisol measurement b. plasma ACTH measurement c. urine free cortisol d. short ACTH stimulation test e. dexamethasone suppression test
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