Neoplasia Practice Questions

Q: What is the typical nuclear cytoplasmic ratio in malignant cells?

1:1. **Explanation:** In pathology, the **Nuclear-Cytoplasm (N:C) ratio** is a critical morphological hallmark used to differentiate benign from malignant cells. [1] **1. Why 1:1 is Correct:** In normal, mature cells, the nucleus is relatively small compared to the volume of the cytoplasm, typically maintaining a ratio of **1:4 or 1:6**. However, malignant cells undergo rapid proliferation and metabolic hyperactivity. This leads to **nuclear enlargement (macronucleosis)** due to increased DNA content (polyploidy/aneuploidy), chromatin redistribution, and enlarged nucleoli. [1] As the nucleus expands to occupy a significant portion of the cell volume, the ratio shifts toward **1:1**. **2. Analysis of Incorrect Options:** * **Options A (1:6) and B (1:5):** These represent the **normal physiological range** for most resting or differentiated human cells. A high volume of cytoplasm relative to the nucleus indicates cellular maturity and specialized function rather than malignancy. * **Option D (6:4):** While malignant nuclei are large, a ratio where the nucleus significantly exceeds the total cell volume (beyond 1:1) is not the standard textbook definition for the **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 276-280.

Q: Zellballen pattern is seen in which of the following tumors?

All of the above. **Explanation:** The **Zellballen pattern** (German for "cell balls") is the characteristic histological arrangement seen in tumors derived from **extra-adrenal paraganglia** and the **adrenal medulla**. 1. **Underlying Concept:** This pattern consists of nests or clusters of polygonal **chief cells** (neurosecretory cells) surrounded by a delicate vascular stroma and peripheral, spindle-shaped **sustentacular cells**. This architecture is the hallmark of all tumors belonging to the paraganglioma family [1]. 2. **Why "All of the Above" is Correct:** * **Pheochromocytoma (Option B):** This is essentially an intra-adrenal paraganglioma. It classically exhibits the Zellballen pattern [1]. * **Paragangliomas (Option A):** This is the general term for these tumors when they occur at extra-adrenal sites (e.g., organ of Zuckerkandl) [2]. * **Carotid Body Tumor (Option C):** This is a specific type of parasympathetic paraganglioma located at the bifurcation of the carotid artery. It also demonstrates the Zellballen architecture. **High-Yield Clinical Pearls for NEET-PG:** * **Staining:** Chief cells are positive for neuroendocrine markers (**Chromogranin** and **Synaptophysin**), while Sustentacular cells are positive for **S-100**. * **Electron Microscopy:** Shows characteristic "dense-core" neurosecretory granules. * **Rule of 10s (Pheochromocytoma):** 10% bilateral, 10% familial, 10% malignant, 10% extra-adrenal, and 10% occur in children [1]. * **Malignancy:** Histology (including the Zellballen pattern) cannot reliably distinguish between benign and malignant tumors; malignancy is defined only by the presence of **metastases** to non-chromaffin sites [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, pp. 1137-1138. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, p. 1137.

Question 1

What is the typical nuclear cytoplasmic ratio in malignant cells?

Accepted Answer

1:1

Answer

1:6

Answer

1:5

Answer

6:4

Question 2

Loss of heterozygosity means?

Accepted Answer

Loss of a normal allele in a heterozygous gene.

Answer

Loss of a single arm of a chromosome.

Answer

Loss of a mutant allele in a mutant gene.

Answer

Loss of a normal allele in a normal gene.

Question 3

Carcinoid tumors are known to secrete which of the following substances?

Accepted Answer

5-HT (Serotonin)

Answer

Histamine

Answer

VMA (Vanillylmandelic acid)

Answer

Bradykinin

Question 4

A 53-year-old woman presents with increasing malaise. Physical examination reveals no abnormalities, but a stool guaiac test is positive. Her hemoglobin level is 7.9 g/dL. Colonoscopy identifies a 3-cm sessile mass in the cecum. Biopsy of the mass shows a moderately differentiated adenocarcinoma confined to the mucosa. Abdominal CT scan shows no lymphadenopathy or hepatic lesions. What is the best course of action?

Accepted Answer

Resect the tumor with adequate margins

Answer

Administer a multiagent chemotherapeutic regimen

Answer

Observe the lesion for further increase in size

Answer

Remove the entire colon to prevent a recurrence

Question 5

Which feature is the most reliable indicator of a malignant tumor?

Accepted Answer

Metastasis

Answer

Local invasion

Answer

Rapid growth

Answer

Poor differentiation

Question 6

All of the following statements about carcinoid syndrome are true EXCEPT?

Accepted Answer

Foregut carcinoids are usually argentaffin positive.

Answer

Atypical carcinoid syndrome is usually produced by foregut carcinoids.

Answer

Plasma serotonin levels are normal in atypical carcinoid syndrome.

Answer

Midgut carcinoids have high serotonin content.

Question 7

Zellballen pattern is seen in which of the following tumors?

Accepted Answer

All of the above

Answer

Paragangliomas

Answer

Pheochromocytoma

Answer

Carotid body tumor

Question 8

Moderately increased risk of invasive breast carcinoma is associated with which of the following benign breast lesions?

Accepted Answer

Atypical lobular hyperplasia

Answer

Sclerosing adenosis

Answer

Apocrine metaplasia

Answer

Squamous metaplasia

Question 9

Which of the following locations can a paraganglioma be seen in?

Accepted Answer

All of the above

Answer

Carotid body tumor

Answer

Thorax

Answer

Paravertebral location

Question 10

What is the tumor marker for dysgerminoma?

Accepted Answer

LDH

Answer

AFP

Answer

HCG

Answer

CA-125

Neoplasia — MCQs

Neoplasia — MCQs

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