General Pathology Practice Questions

Q: Which of these is a pseudocyst:

Traumatic cyst. ***Traumatic cyst*** - A **traumatic cyst** (also known as a **solitary bone cyst** or **simple bone cyst**) lacks an **epithelial lining**, which is the defining characteristic of a pseudocyst [1]. - These cysts are typically associated with **trauma** and are filled with serosanguineous fluid or may be empty, often found in the jaws or long bones. - The cavity wall is composed of connective tissue without any epithelial lining [1]. *Nasolabial cyst* - A **nasolabial cyst** is a **true cyst** because its lumen is lined by **stratified squamous or pseudostratified columnar epithelium**. - It is a soft tissue cyst located at the junction of the ala of the nose and the upper lip. *Globulomaxillary cyst* - The globulomaxillary cyst is now regarded as a **misnomer**; similar lesions are identified as **odontogenic cysts**, typically a **radicular cyst** or **keratocystic odontogenic tumor**. - These are **true cysts** with an epithelial lining, originating from odontogenic epithelial rests. *Radicular cyst* - A **radicular cyst** is a **true cyst** arising from epithelial rests of Malassez in response to inflammation from a non-vital tooth. - It is histologically characterized by a **lumen lined with stratified squamous epithelium**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Pancreas, p. 895.

Q: Radiation-induced necrosis can be diagnosed by:

Biopsy. ***Biopsy*** - A **biopsy** is the definitive diagnostic method for radiation-induced necrosis, allowing for histological examination of tissue to confirm necrosis and rule out residual or recurrent tumor. [1], [2] - It provides a direct view of cellular changes, identifying **necrosis, atypical cells**, and ruling out **malignancy**. *MRI* - While **MRI** can show structural changes indicative of necrosis (e.g., mass effect, edema), it often cannot definitively differentiate between **radiation necrosis** and **tumor recurrence.** [2] - It often shows **T1 hypointensity** and **T2 hyperintensity**, but these findings are not specific. *CT* - **CT scans** are useful for detecting gross changes like **mass effect** and **edema** but have limited sensitivity for distinguishing necrosis from tumor recurrence. - It may show **low-density lesions** but lacks the resolution and specificity for precise diagnosis. *PET* - **PET scans** measure metabolic activity and can help distinguish between **tumor recurrence** (high uptake) and **radiation necrosis** (low uptake) in some cases. - However, false positives can occur, as some inflammatory processes in necrosis can also show increased uptake, making it **less definitive** than a biopsy. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1307-1308. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 340-341.

Q: Cells are most sensitive to ionizing radiation during which phase?

G2M phase. ***G2M phase*** - Cells are most sensitive to ionizing radiation during the **G2 phase** and **M phase** (mitosis) due to the highly condensed chromatin structure and active DNA repair mechanisms being less efficient [2], [3]. - During G2, DNA synthesis is complete, and the cell is preparing for division, making DNA damage particularly detrimental and harder to repair without compromising cell viability [2]. *S phase* - Cells in the **S phase** (DNA synthesis phase) are relatively radioresistant because of active **DNA replication** and associated repair mechanisms. - These repair pathways are highly efficient at correcting DNA damage during replication, making the cell less susceptible to radiation-induced lethality. *G1 phase* - Cells in the **G1 phase** (first gap phase) show intermediate radiosensitivity. - While less sensitive than G2/M phases, G1 cells are more vulnerable than those in late S phase due to active metabolic preparation for DNA synthesis [1]. *G0 phase* - Cells in the **G0 phase** (quiescent phase) are generally **radioresistant** because they are not actively dividing or synthesizing DNA [3]. - They have ample time for DNA repair before re-entering the cell cycle, and their DNA structure is less vulnerable than during active division [3]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 302-303. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. With Illustrations By, pp. 37-38. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Central Nervous System Synapse, pp. 436-437.

Q: Phase-contrast microscopy is based on the principle of:

Phase differences of light. ***Phase differences of light*** - Phase-contrast microscopy converts small **phase shifts** in light passing through a transparent specimen into changes in **brightness** or contrast. - This allows the visualization of unstained, transparent specimens without damaging them. *Light attenuation* - Light attenuation refers to the **reduction in light intensity** as it passes through a medium due to absorption or scattering. - While some light attenuation occurs, it is not the primary principle by which phase-contrast microscopy generates images. *Light scattering* - Light scattering is the process by which light is **diverted from its original path** due to interaction with particles in the medium. - While scattering can contribute to image formation in some microscopic techniques, phase-contrast microscopy primarily relies on phase shifts rather than scattering. *Different refractive indices of object* - While different refractive indices of an object cause the **phase shifts** that phase-contrast microscopy exploits, stating "different refractive indices of object" alone is an incomplete description of the underlying principle. - The technique specifically visualizes these **phase differences** that result from varying refractive indices, converting them into amplitude differences.

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: 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: 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.

Q: Term "Pseudo" used in "Pseudocyst" is due to its -

Lining. ***Lining*** - A **pseudocyst** lacks an **epithelial or endothelial lining**, which is characteristic of true cysts [1]. - Instead, its wall is formed by **fibrous tissue** and **granulation tissue** surrounding fluid collections [1]. *Site* - The term "pseudo" does not refer to the **location** of the cyst. - Pseudocysts commonly occur in specific organs like the **pancreas**, but their site is not what defines them as "pseudo" [1]. *Course* - The **clinical course** or progression of a pseudocyst, whether it resolves spontaneously or requires intervention, is not the basis for the "pseudo" designation [1]. - Its behavior, while clinically important, does not define its fundamental nature. *Contents* - The contents of a pseudocyst, which often include **necrotic debris**, **inflammatory fluid**, or **pancreatic enzymes**, do not define the "pseudo" aspect. - The fluid composition is a result of the underlying condition, not the reason for the term "pseudo." **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Pancreas, p. 895.

Question 1

Which of these is a pseudocyst:

Accepted Answer

Traumatic cyst

Answer

Nasolabial cyst

Answer

Globulomaxillary cyst

Answer

Radicular cyst

Question 2

Radiation-induced necrosis can be diagnosed by:

Accepted Answer

Biopsy

Answer

MRI

Answer

CT

Answer

PET

Question 3

Cells are most sensitive to ionizing radiation during which phase?

Accepted Answer

G2M phase

Answer

S phase

Answer

G0 phase

Answer

G1 phase

Question 4

Phase-contrast microscopy is based on the principle of:

Accepted Answer

Phase differences of light

Answer

Light attenuation

Answer

Light scattering

Answer

Different refractive indices of object

Question 5

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 6

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 7

Radiation causes cell death by:

Accepted Answer

Ionization

Answer

Charring of nucleoproteins

Answer

Disruption of cytosol

Answer

Destroying their mitochondria

Question 8

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 9

Fat necrosis is common in:

Accepted Answer

Breast

Answer

Retroperitoneal fat

Answer

Omentum

Answer

All of the options

Question 10

Term "Pseudo" used in "Pseudocyst" is due to its -

Accepted Answer

Lining

Answer

Site

Answer

Course

Answer

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General Pathology — MCQs

General Pathology — MCQs

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