Multiple Endocrine Neoplasia Syndromes — MCQs
What is the most common thyroid tumor associated with multiple endocrine neoplasia (MEN)?
Submucosal neuroma is associated with
MC location of gastrinoma in MEN-1 syndrome?
A patient presents with headaches, palpitations, hypertension, and urine VMA positivity. The biopsy findings are shown in the image. Which of the following statements is correct?
Which of the following glands is NOT typically involved in Multiple Endocrine Neoplasia type II A (MEN II A)?
Which of the following syndromes is least likely to be associated with obesity?
Which of the following conditions is least associated with tumor suppressor genes?
Anaplasia is
Absence of differentiation is known as:-
Which type of thyroid cancer is associated with primary hyperparathyroidism and phaeochromocytoma?
Multiple Endocrine Neoplasia Syndromes Indian Medical PG Practice Questions and MCQs
Question 1: What is the most common thyroid tumor associated with multiple endocrine neoplasia (MEN)?
- A. Follicular
- B. Papillary
- C. Anaplastic
- D. Medullary (Correct Answer)
Explanation: ***Medullary*** - The **commonest thyroid tumor** in Multiple Endocrine Neoplasia (MEN) type 2 is medullary thyroid carcinoma, associated with **calcitonin production** [1]. - It arises from **C cells (parafollicular cells)** and is linked to **RET oncogene mutations** in MEN syndromes [1]. *Papillary* - Papillary thyroid carcinoma is the **most common thyroid cancer overall**, but not specifically associated with MEN syndromes. - It typically presents with **lymphatic spread**, whereas medullary carcinoma has a different genetic association. *Follicular* - Follicular thyroid carcinoma is less common in MEN and usually occurs sporadically. - It primarily arises from **follicular cells** and involves a different mechanism than medullary carcinoma. *Anaplastic* - Anaplastic thyroid carcinoma is a rare and highly aggressive form, not commonly associated with MEN. - It usually arises from **differentiated thyroid cancers** and presents in older patients, which does not align with MEN's typical presentations. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, pp. 1102-1103.
Question 2: Submucosal neuroma is associated with
- A. MEN 2 A
- B. MEN 2B (Correct Answer)
- C. MEN 1
- D. None of the options
Explanation: ***MEN 2B (Multiple Endocrine Neoplasia Type 2B)*** - **Submucosal neuromas** are a distinctive feature of MEN 2B, specifically noticeble as mucosal neuromas on the lips, tongue, and gastrointestinal tract. - This syndrome is characterized by the presence of **medullary thyroid carcinoma**, **pheochromocytoma**, and mucocutaneous neuromas, without hyperparathyroidism. *MEN 2A (Multiple Endocrine Neoplasia Type 2A)* - MEN 2A is characterized by **medullary thyroid carcinoma**, **pheochromocytoma**, and **primary hyperparathyroidism**. - It does not typically feature extensive **submucosal neuromas** as a primary diagnostic criterion. *MEN 1 (Multiple Endocrine Neoplasia Type 1)* - MEN 1 involves tumors of the **parathyroid glands**, **anterior pituitary**, and **pancreatic islet cells** (the '3 Ps'). - **Submucosal neuromas** are not a component of the MEN 1 syndrome. *None of the options* - This option is incorrect because **submucosal neuromas** are a characteristic finding in MEN 2B.
Question 3: MC location of gastrinoma in MEN-1 syndrome?
- A. Jejunum
- B. Ileum
- C. Duodenum
- D. Pancreas (Correct Answer)
Explanation: ***Pancreas*** - In **Multiple Endocrine Neoplasia type 1 (MEN-1) syndrome**, gastrinomas are most commonly found in the **pancreas**. - While sporadic gastrinomas are frequently duodenal, the **genetic predisposition of MEN-1** shifts the primary location to the pancreas. *Duodenum* - **Sporadic gastrinomas** without MEN-1 syndrome are most frequently located in the **duodenum**, particularly the first and second parts. - However, in the context of **MEN-1**, the pancreas becomes the predominant site for gastrinoma development. *Jejunum* - The jejunum is an **uncommon location** for gastrinomas in both sporadic cases and those associated with MEN-1. - Gastrinomas found in the jejunum are typically **rare** and often associated with more aggressive disease or disseminated metastasis. *Ileum* - The ileum is an **extremely rare site** for gastrinomas. - Gastrinomas developing in the ileum are usually **ectopic** and are not typically the primary location in either sporadic cases or MEN-1 syndrome.
Question 4: A patient presents with headaches, palpitations, hypertension, and urine VMA positivity. The biopsy findings are shown in the image. Which of the following statements is correct?
- A. Mostly malignant
- B. Mostly in children
- C. Mostly bilateral
- D. Associated with MEN 2A (Correct Answer)
Explanation: ***Associated with MEN 2A*** - The clinical presentation (headaches, palpitations, hypertension) and positive **urine VMA (vanillylmandelic acid)** strongly suggest a **pheochromocytoma**. - Pheochromocytomas are tumors of the adrenal medulla that secrete catecholamines and are frequently associated with **Multiple Endocrine Neoplasia Type 2A (MEN 2A)**, along with medullary thyroid carcinoma and primary hyperparathyroidism. *Mostly malignant* - Pheochromocytomas are generally benign, with approximately **10% being malignant** ("rule of 10s"). - Malignancy is difficult to predict based on histology alone and is usually defined by the presence of **metastases**. *Mostly in children* - While pheochromocytomas can occur at any age, they are **more common in adults**, typically between 30 and 50 years old. - When they do occur in children, they are more often bilateral, extra-adrenal, or associated with genetic syndromes. *Mostly bilateral* - The majority of pheochromocytomas (approximately **90%**) are **unilateral**. - Bilateral pheochromocytomas are often seen in genetic syndromes such as **MEN 2**, von Hippel-Lindau disease, and neurofibromatosis type 1.
Question 5: Which of the following glands is NOT typically involved in Multiple Endocrine Neoplasia type II A (MEN II A)?
- A. Pituitary gland (Correct Answer)
- B. Thyroid gland
- C. Parathyroid gland
- D. Adrenal gland
Explanation: ***Pituitary gland*** - The **pituitary gland** is not a characteristic component of **MEN II A**. It is, however, associated with **Multiple Endocrine Neoplasia type I (MEN I)**, which involves the 3 Ps: **pituitary**, **parathyroid**, and **pancreas** [1]. - **MEN IIA** classically involves **medullary thyroid carcinoma**, **pheochromocytoma**, and **parathyroid hyperplasia** [1]. *Thyroid gland* - The **thyroid gland** is centrally involved in MEN IIA, specifically through the development of **medullary thyroid carcinoma (MTC)**, a hallmark feature. - MTC arises from the parafollicular C cells of the thyroid and secretes **calcitonin**. *Parathyroid gland* - The **parathyroid gland** is often involved in MEN IIA, typically presenting as **parathyroid hyperplasia** or adenoma, leading to **primary hyperparathyroidism**. - This typically results in elevated **parathyroid hormone** levels and **hypercalcemia**. *Adrenal gland* - The **adrenal gland** is a key player in MEN IIA due to the occurrence of **pheochromocytoma**, a tumor of the adrenal medulla. - Pheochromocytomas can be bilateral and secrete **catecholamines**, leading to hypertension and other symptoms.
Question 6: Which of the following syndromes is least likely to be associated with obesity?
- A. Cushing syndrome
- B. Prader willi syndrome
- C. Sipple syndrome (Correct Answer)
- D. Pickwickian syndrome
Explanation: ***Sipple syndrome*** - Sipple syndrome, also known as **multiple endocrine neoplasia type 2**, is primarily associated with **medullary thyroid carcinoma** and does not typically correlate with obesity. - It includes signs like **pheochromocytoma** and **hyperparathyroidism**, but obesity is not a prominent feature. *Cushing syndrome* - Cushing syndrome leads to **excess cortisol**, commonly resulting in weight gain and central obesity [1]. - Characteristic features include **moon facies**, **buffalo hump**, and easy bruising, all associated with obesity [1]. *Pickwinian syndrome* - Pickwinian syndrome, characterized by **severe obesity**, is a condition primarily affecting physical stature and weight. - It is linked to **hypoventilation** and sleep apnea, reinforcing the presence of obesity. *Prader willi syndrome* - Prader-Willi syndrome is marked by **insatiable hunger** leading to **obesity** due to hypothalamic dysfunction [2]. - Individuals with this condition also demonstrate **hypotonia** and developmental delays, commonly accompanied by obesity [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, pp. 1127-1129. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Central Nervous System Synapse, pp. 454-455.
Question 7: Which of the following conditions is least associated with tumor suppressor genes?
- A. Neurofibromatosis
- B. Retinoblastoma
- C. Acute Myeloid Leukemia (AML) (Correct Answer)
- D. Breast cancer
Explanation: ***Multiple endocrine neoplasia*** - This syndrome involves mutations in **proto-oncogenes** like RET rather than tumor suppressor genes. - The condition is mainly characterized by the presence of **multiple endocrine tumors** rather than a failure of tumor suppression. *Retinoblastoma* - Associated with mutations in the **RB1 tumor suppressor gene**, leading to uncontrolled cell proliferation [1] [2]. - Classic example of **loss of function** in a tumor suppressor gene resulting in cancer, specifically in early childhood [1] [2]. *Neurofibromatosis* - Caused by mutations in **NF1** or **NF2 genes**, both of which function as tumor suppressors. - Leads to benign tumors such as **neurofibromas** and other neurogenic tumors due to malfunction in tumor suppression. *Breast cancers* - Often related to mutations in tumor suppressor genes such as **BRCA1** and **BRCA2**, which increase cancer risk [2]. - Implicated in the hereditary form of breast and ovarian cancers due to their roles in DNA repair and cell cycle regulation [2]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 227-228. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 298-302.
Question 8: Anaplasia is
- A. Changing one type of epithelium to another
- B. Nuclear chromatin
- C. Lack of differentiation (Correct Answer)
- D. Morphological changes
Explanation: ***Lack of differentiation*** - Anaplasia refers to a **loss of differentiation** in cells, making them more primitive and less specialized [1]. - It is often seen in **malignant tumors**, indicating a poor prognosis and aggressive behavior [1]. *Morphological changes* - While anaplasia involves **morphological changes**, this term is too broad and can relate to various cellular alterations, not exclusively anaplasia [1]. - Anaplasia specifically emphasizes **lack of differentiation**, distinct from general changes in cell appearance [1]. *Changing one type of epithelium to another* - This describes a process known as **metaplasia**, where one adult cell type transforms into another, not anaplasia. - Anaplasia signifies a **de-differentiation** rather than a change to a different epithelial type [1]. *Nuclear chromatin* - While changes in **nuclear chromatin** can occur in anaplastic cells, this does not define anaplasia itself [1]. - Anaplasia primarily refers to **loss of cell differentiation**, making this option insufficient to describe the concept [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 276-280.
Question 9: Absence of differentiation is known as:-
- A. Dysplasia
- B. Anaplasia (Correct Answer)
- C. Metaplasia
- D. Hyperplasia
Explanation: ***Anaplasia*** - **Anaplasia** refers to the **lack of differentiation** in cells, meaning they lose the morphological and functional characteristics of mature cells [1]. - It is a hallmark of **malignancy** and often associated with aggressive tumors. - Key features include pleomorphism, abnormal nuclear morphology, increased mitotic activity, and loss of polarity [2]. *Dysplasia* - **Dysplasia** involves **disordered growth** and maturation of cells, often characterized by pleomorphism, loss of polarity, and increased mitotic figures. - While it can be a precursor to cancer, it represents an **abnormal development** rather than a complete absence of differentiation [3]. - Dysplastic cells retain some degree of differentiation but show architectural and cytological abnormalities. *Metaplasia* - **Metaplasia** is the **reversible change** of one adult differentiated cell type to another adult differentiated cell type [3]. - This adaptation usually occurs in response to chronic irritation or stress, for example, columnar to squamous epithelium in the respiratory tract of smokers. - Both cell types involved are fully differentiated, just different types. *Hyperplasia* - **Hyperplasia** is an **increase in the number of cells** in an organ or tissue, leading to increased volume [4]. - This is an adaptive response to stimuli, such as hormonal stimulation (e.g., endometrial hyperplasia) or increased functional demand. - The cells remain well-differentiated and maintain normal architecture. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 276-278. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 278. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 278-280. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 85-87.
Question 10: Which type of thyroid cancer is associated with primary hyperparathyroidism and phaeochromocytoma?
- A. Medullary carcinoma of the thyroid (Correct Answer)
- B. Papillary carcinoma of the thyroid
- C. Anaplastic carcinoma of the thyroid
- D. Follicular carcinoma of the thyroid
Explanation: ***Medullary carcinoma of the thyroid*** - Associated with **multiple endocrine neoplasia (MEN) syndrome type 2**, which includes primary hyperparathyroidism and phaeochromocytoma [1]. - Medullary carcinoma arises from **C cells** (parafollicular cells) and is linked with **elevated calcitonin** levels. *Papillary carcinoma of the thyroid* - The most common type of thyroid cancer, but **not associated** with MEN syndromes. - Typically presents as a solitary **nodule** and is linked with **radiation exposure** rather than endocrine syndromes. *Anaplastic carcinoma of the thyroid* - A highly aggressive and undifferentiated form of thyroid cancer, often associated with **poor prognosis**. - Usually arises in older adults and does not have associations with **hyperparathyroidism** or phaeochromocytoma. *Follicular carcinoma of the thyroid* - Characterized by **thyroid follicle formation** and can be associated with **iodine deficiency**, but not with MEN syndromes. - It usually presents as a **solitary thyroid nodule** and lacks connection with **primary hyperparathyroidism**.
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