General Pathology Practice Questions

Q: Which of the following is most specific for CSF in rhinorrhea?

Beta-2 transferrin. ***b-2 transferrin*** - **Beta-2 transferrin** is a desialylated form of transferrin found almost exclusively in **cerebrospinal fluid (CSF)**, perilymph, and aqueous humor. - Its presence in nasal discharge is highly **specific** for the diagnosis of CSF rhinorrhea, as it is not typically found in serum or other bodily secretions. *Albumin* - **Albumin** is abundant in both serum and CSF, so its presence in nasal discharge is not specific for CSF and could indicate the presence of blood or inflammatory exudates. - Measuring albumin levels alone would not reliably differentiate CSF rhinorrhea from other types of nasal discharge. *Macroglobulin* - **Alpha-2 macroglobulin** is a large plasma protein primarily found in **blood**, not typically in significant concentrations in CSF. - Its presence would be more indicative of serum contamination rather than CSF leakage. *b-2 microglobulin* - **Beta-2 microglobulin** is a protein found on the surface of most nucleated cells and is present in various body fluids including **serum** and **CSF**, though usually in higher concentrations in conditions associated with inflammation or malignancy. - While present in CSF, it is not specific enough to reliably distinguish CSF rhinorrhea from other types of nasal discharge, especially if blood is also present.

Q: A 22-year-old man complains about his inability to conceive a child. On physical examination, the patient is noted to be tall (6 ft, 5 in) and exhibits gynecomastia and testicular atrophy. Laboratory studies demonstrate increased serum levels of follicle-stimulating hormone. Cytogenetic studies reveal a chromosomal abnormality. What is the most common cause of this patient's chromosomal abnormality?

Failure of chromosome separation during gamete formation. ***Failure of chromosome separation during gamete formation*** - The patient's symptoms (tall stature, gynecomastia, testicular atrophy, infertility, and elevated FSH) are classic for **Klinefelter syndrome**, which is characterized by a **47,XXY karyotype** [1]. - This extra X chromosome most commonly arises from **nondisjunction** (failure of homologous chromosomes or sister chromatids to separate) during **meiosis I** in the mother or, less frequently, during meiosis I or II in the father, or post-zygotic mitotic nondisjunction. *Chromosomal instability during cell division* - This typically refers to a general propensity for cells to acquire chromosomal aberrations, often seen in cancers or specific genetic syndromes like **Fanconi anemia** or **Bloom syndrome**. - While it can lead to chromosomal abnormalities, it is not the primary mechanism behind the specific 47,XXY aneuploidy seen in Klinefelter syndrome. *Chromosomal translocation during meiosis* - **Translocations** involve the exchange of genetic material between non-homologous chromosomes. - While translocations can cause genetic disorders, they result in a quantitative change in genetic material (e.g., partial trisomy or monosomy), not the extra whole sex chromosome characteristic of Klinefelter syndrome. *Structural rearrangement of chromosomes* - This is a broad category that includes deletions, duplications, inversions, and translocations, all of which alter the arrangement of genetic material within or between chromosomes. - While an extra chromosome is a type of chromosomal abnormality, the mechanism of nondisjunction leading to an entire extra chromosome (like an extra X) is a more specific and accurate description for the cause of **Klinefelter syndrome** [1], [2].

Q: Coffee bean nuclei are seen in all of the following except:

Follicular carcinoma thyroid. ***Follicular carcinoma thyroid*** - **Follicular carcinoma** is characterized by uniform follicular cells, with features like **nuclear grooves** and **intranuclear pseudoinclusions** being more typical of **papillary thyroid carcinoma**, not follicular. - The nuclei in follicular carcinoma do not typically exhibit the characteristic **longitudinal grooves** resembling "coffee beans" seen in some other tumors. *Granulosa cell tumor* - **Granulosa cell tumors** are ovarian stromal tumors often characterized by **longitudinal nuclear grooves**, giving the appearance of **"coffee bean" nuclei**. - These grooves are a key diagnostic feature, along with structures like **Call-Exner bodies**. *Langerhans cell histiocytosis* - Cells in **Langerhans cell histiocytosis** are large, mononuclear cells with abundant cytoplasm and distinctive **grooved or reniform nuclei**, often described as **"coffee bean" shaped** [1]. - These nuclear grooves are a hallmark feature, visible on electron microscopy as **Birbeck granules** [1]. *Brenner tumor* - **Brenner tumors** are ovarian tumors that can arise from transitional cell nests and often feature prominent **nuclear grooves** in their epithelial cells. - These grooves can appear as **"coffee bean" nuclei**, particularly in the spindle cell variant or solid areas of the tumor. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 629-630.

Q: An 80-year-old woman presents with a 4-hour history of fever, shaking chills, and disorientation. Her blood pressure is 80/40 mm Hg. Physical examination shows diffuse purpura on her upper arms and chest. Blood cultures are positive for Gram-negative organism. Which of the following cytokines is primarily involved in the pathogenesis of direct vascular injury in this patient with septic shock?

Tumor necrosis factor-a. ***Tumor necrosis factor-a*** - **TNF-α** is a crucial cytokine in the pathogenesis of **septic shock** by mediating inflammation and directly causing vascular injury. - It triggers systemic immune responses, leading to **endothelial damage**, increased vascular permeability, and **hypotension**, contributing to diffuse purpura and organ dysfunction. [1], [2] *Platelet-derived growth factor* - **PDGF** is primarily involved in **wound healing** and **angiogenesis**, promoting cell growth and division. [3] - It does not have a direct role in the acute inflammatory and vascular injury seen in **septic shock**. *Transforming Growth Factor-b (TGFb)* - **TGF-β** is known for its role in **immune regulation**, **fibrosis**, and cell differentiation, often acting as an anti-inflammatory cytokine. [3] - It is not a primary mediator of the acute vascular injury and inflammatory cascade characteristic of **septic shock**. *Interferon-g* - **Interferon-γ** is important in **antiviral** and **antitumor** immunity, activating macrophages and NK cells. - While it modulates immune responses, it is not the primary cytokine responsible for the direct vascular injury and shock seen in this patient's presentation.

Q: Fat necrosis is common in:

Breast. ***Breast*** - **Fat necrosis** in the breast is a relatively common benign condition, often resulting from trauma, surgery, or radiation. - It presents as a palpable lump that can mimic malignancy, making its differentiation crucial. *Retroperitoneal fat* - While fat necrosis can occur in the retroperitoneum, particularly in cases of **acute pancreatitis**, it is not considered "common" in this location independently [1]. - The primary tissue affected in pancreatitis is the pancreas itself, with necrosis extending to surrounding fat [1]. *Omentum* - **Omental fat necrosis** can occur but is rare and usually associated with torsion of the omentum or, less commonly, blunt abdominal trauma. - It is not a common site for isolated fat necrosis compared to the breast. *All of the options* - Although fat necrosis can occur in all these locations under specific circumstances, it is not "common" in all of them when considering the typical incidence of the condition. - **Breast fat necrosis** is more frequently encountered in clinical practice than in the omentum or retroperitoneal region. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Pancreas, p. 895.

Question 1

The component of cell most affected by radiation?

Accepted Answer

DNA

Answer

Cell wall

Answer

Cell membrane

Answer

Cytoplasm

Question 2

Which of the following is most specific for CSF in rhinorrhea?

Accepted Answer

Beta-2 transferrin

Answer

Albumin

Answer

Macroglobulin

Answer

Beta-2 microglobulin

Question 3

A 22-year-old man complains about his inability to conceive a child. On physical examination, the patient is noted to be tall (6 ft, 5 in) and exhibits gynecomastia and testicular atrophy. Laboratory studies demonstrate increased serum levels of follicle-stimulating hormone. Cytogenetic studies reveal a chromosomal abnormality. What is the most common cause of this patient's chromosomal abnormality?

Accepted Answer

Failure of chromosome separation during gamete formation

Answer

Chromosomal instability during cell division

Answer

Structural rearrangement of chromosomes

Answer

Chromosomal translocation during meiosis

Question 4

Coffee bean nuclei are seen in all of the following except:

Accepted Answer

Follicular carcinoma thyroid

Answer

Granulosa cell tumor

Answer

Langerhans cell histiocytosis

Answer

Brenner tumor

Question 5

Radiation causes cell death by:

Accepted Answer

Ionization

Answer

Charring of nucleoproteins

Answer

Disruption of cytosol

Answer

Destroying their mitochondria

Question 6

A 29-year-old man sustains a left femoral fracture in a motorcycle accident. His leg is placed in a plaster cast. After his left leg has been immobilized for 6 weeks, the diameter of the left calf has decreased in size. This change in size is most likely to result from which of the following alterations in his calf muscles?

Accepted Answer

Atrophy

Answer

Hyalinosis

Answer

Dystrophy

Answer

Aplasia

Question 7

An 80-year-old woman presents with a 4-hour history of fever, shaking chills, and disorientation. Her blood pressure is 80/40 mm Hg. Physical examination shows diffuse purpura on her upper arms and chest. Blood cultures are positive for Gram-negative organism. Which of the following cytokines is primarily involved in the pathogenesis of direct vascular injury in this patient with septic shock?

Accepted Answer

Tumor necrosis factor-a

Answer

Platelet-derived growth factor

Answer

Transforming Growth Factor-b (TGFb)

Answer

Interferon-g

Question 8

Fat necrosis is common in:

Accepted Answer

Breast

Answer

Retroperitoneal fat

Answer

Omentum

Answer

All of the options

Question 9

White infarcts are seen in which of the following?

Accepted Answer

Spleen

Answer

Heart

Answer

Kidney

Answer

All of the options

Question 10

Which of these cells is most radio-resistant?

Accepted Answer

Muscle cells

Answer

Fibroblasts

Answer

Vascular endothelial cells

Answer

Early precursor cells of erythroblastic series

General Pathology — MCQs

General Pathology — MCQs

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