Plasma Cell Disorders — MCQs
What is the major fibril protein associated with Primary Amyloidosis?
A patient presents with confusion, hypercalcemia, and renal dysfunction. Likely diagnosis?
Bone marrow biopsy shows increased plasma cells with 'clock-face' chromatin pattern and perinuclear halo. Diagnosis?
Which of the following is the most important diagnostic investigation for multiple myeloma?
Hyperviscosity is seen in all, except:
Multiple myeloma is characterized by which of the following?
An elderly male patient presented with clinical symptoms and signs consistent with possible multiple myeloma. Electrophoresis shows an M spike, and immunofixation findings are shown below. Which of the following statements best corresponds to the findings?
Which of the following amyloid forms is seen in secondary amyloidosis associated with chronic diseases?
Which among the following statements is wrong?
Bone marrow biopsy shows increased plasma cells with 'clock-face' chromatin pattern and perinuclear halo. Diagnosis?
Plasma Cell Disorders Indian Medical PG Practice Questions and MCQs
Question 1: What is the major fibril protein associated with Primary Amyloidosis?
- A. Immunoglobulin Light Chain (Correct Answer)
- B. Amyloid Associated protein (AA)
- C. Procalcitonin (PCT)
- D. Transthyretin (TTR)
Explanation: ***AL*** - In Primary Amyloidosis, **AL amyloid** is derived from immunoglobulin light chains produced by **plasma cell dyscrasias** [1]. - This type of amyloidosis is commonly associated with conditions like **multiple myeloma** or monoclonal gammopathy [1]. *Transthyretin* - This protein is associated with **Familial Amyloid Polyneuropathy** and **Senile Systemic Amyloidosis**, not Primary Amyloidosis. - Transthyretin amyloidosis (ATTR) results from **mutations** or **aging**, contributing to different clinical presentations than AL. *AA* - AA amyloidosis is secondary and occurs due to **chronic inflammatory** conditions, such as rheumatoid arthritis or chronic infections. - It is not the main fibril protein in **Primary Amyloidosis**, which is specifically linked to **light chains**. *Procalcitonin* - Procalcitonin is a **biomarker** used primarily for diagnosing bacterial infections, particularly sepsis, and is not involved in amyloidogenesis. - It does not relate to amyloidosis and is not a component of amyloid fibrils. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 266-267.
Question 2: A patient presents with confusion, hypercalcemia, and renal dysfunction. Likely diagnosis?
- A. Pernicious anemia
- B. Acute hepatitis
- C. Iron deficiency anemia
- D. Multiple myeloma (Correct Answer)
Explanation: ***Multiple myeloma*** - Multiple myeloma often presents with the classic triad of **hypercalcemia**, **renal dysfunction**, and **anemia**, which can cause confusion (often referred to as CRAB criteria: Calcium elevation, Renal insufficiency, Anemia, Bone lesions) [1]. - The disease involves the proliferation of **plasma cells** in the bone marrow, leading to these systemic effects [1]. *Pernicious anemia* - Characterized by **Vitamin B12 deficiency** due to lack of intrinsic factor, leading to **megaloblastic anemia** and neurological symptoms. - It does not typically cause **hypercalcemia** or significant **renal dysfunction** directly. *Acute hepatitis* - Primarily affects the **liver**, causing symptoms like **jaundice**, fatigue, and elevated liver enzymes. - It is not associated with **hypercalcemia** or significant primary **renal dysfunction**. *Iron deficiency anemia* - Results from insufficient iron for hemoglobin production, leading to **microcytic hypochromic anemia**. - It does not cause **hypercalcemia** or primary **renal dysfunction**.
Question 3: Bone marrow biopsy shows increased plasma cells with 'clock-face' chromatin pattern and perinuclear halo. Diagnosis?
- A. Multiple myeloma (Correct Answer)
- B. Waldenstrom's
- C. Plasmacytoma
- D. MGUS
Explanation: ***Multiple myeloma*** - The presence of increased **plasma cells** in the bone marrow with a characteristic **'clock-face' chromatin pattern** and **perinuclear halo** is a classic histopathological finding in multiple myeloma. [1] - These features are indicative of abnormal plasma cell proliferation, which is the hallmark of this **B-cell malignancy**. [1] *Waldenstrom's* - Characterized by **lymphoplasmacytocytic lymphoma** with monoclonal IgM gammopathy, but typically does not show the classic "clock-face" morphology of pure plasma cells in the bone marrow. [1] - While there are plasma cells, the predominant cell type would be **lymphoplasmacytoid cells** with lymphoid features. [2] *Plasmacytoma* - A **localized proliferation of plasma cells** but does not necessarily involve diffuse bone marrow infiltration as described, nor does it typically present as a systemic disease initially. [2] - Although it contains plasma cells, the term suggests a single mass rather than generalized increased plasma cells throughout the marrow. [2] *MGUS* - Stands for **Monoclonal Gammopathy of Unknown Significance** and involves a small clone of plasma cells producing a monoclonal protein, but the bone marrow plasma cell percentage is typically **less than 10%** and does not meet criteria for active myeloma. - It is an **asymptomatic precursor condition** and would not usually show such a striking increase or abnormal morphology suggestive of an overt malignancy. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 616-618. [2] 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. 606-608.
Question 4: Which of the following is the most important diagnostic investigation for multiple myeloma?
- A. Lytic bone lesions
- B. Bence jones proteins
- C. Alkaline Phosphatase
- D. Serum electrophoresis (Correct Answer)
Explanation: ### Serum electrophoresis - **Serum protein electrophoresis** (SPEP) is crucial for detecting and quantifying the **monoclonal paraprotein (M-protein)** in the blood, which is characteristic of multiple myeloma [1]. - The presence of a **gamma globulin spike** or **M-spike** on SPEP is a hallmark of the disease [1]. *Lytic bone lesions* - While **lytic bone lesions** are a common and important feature of multiple myeloma, they are a consequence of the disease process rather than the primary diagnostic investigation itself [1]. - Imaging studies like X-rays or MRI are used to detect these lesions, but their presence alone is not sufficient for diagnosis without identification of the M-protein [1]. *Bence jones proteins* - **Bence Jones proteins** are **monoclonal light chains** found in the urine, indicating their presence in the blood. - While important for diagnosis and prognosis, SPEP is generally considered more central as it directly identifies the **monoclonal gammopathy** (M-protein) derived from plasma cells in the serum [1]. *Alkaline Phosphatase* - **Alkaline phosphatase** levels are typically **normal** in multiple myeloma, even in the presence of extensive bone disease. - This is because the lytic lesions in multiple myeloma result from osteoclast activation rather than osteoblastic activity, which would otherwise elevate alkaline phosphatase.
Question 5: Hyperviscosity is seen in all, except:
- A. Cryoglobulinemia
- B. MGUS (Correct Answer)
- C. Lymphoma
- D. Multiple myeloma
Explanation: ***MGUS*** - **Monoclonal gammopathy of undetermined significance (MGUS)** is characterized by a low concentration of **M-protein** in the blood, which is generally not sufficient to cause significant hyperviscosity. - While it is a precursor to multiple myeloma, the lack of end-organ damage and lower M-protein levels mean hyperviscosity syndrome is **rarely seen** in MGUS. *Cryoglobulinemia* - **Cryoglobulins** are immunoglobulins that precipitate at cold temperatures, leading to increased blood viscosity, especially in cooler body parts. - This precipitation can cause symptoms like **Raynaud's phenomenon**, **cutaneous vasculitis**, and **neuropathy**. *Lymphoma* - Certain lymphomas, particularly those producing **large amounts of monoclonal immunoglobulins** (e.g., Waldenström macroglobulinemia, which is a low-grade B-cell lymphoma), can lead to hyperviscosity syndrome [1]. - The elevated protein levels directly increase the **viscosity of the blood**, impairing blood flow [1]. *Multiple myeloma* - Multiple myeloma involves the overproduction of **monoclonal immunoglobulins (M-proteins)** by plasma cells, leading to high protein concentrations in the blood [1]. - These elevated proteins significantly increase blood viscosity, contributing to the symptoms of **hyperviscosity syndrome**, such as visual disturbances, neurological symptoms, and bleeding diathesis [1].
Question 6: Multiple myeloma is characterized by which of the following?
- A. Monoclonal gammopathy (Correct Answer)
- B. Bence Jones proteins
- C. Presence of light chains
- D. Hypergammaglobulinemia
Explanation: ***Monoclonal gammopathy*** - **Multiple myeloma** is defined by the proliferation of a **single clone of plasma cells** that produce a characteristic **monoclonal immunoglobulin** (M-protein) detected in serum or urine [1]. - This **monoclonal expansion** leads to the accumulation of abnormal, identical **immunoglobulins** or their fragments [2]. *Presence of light chains* - While the presence of **monoclonal free light chains** (either kappa or lambda) is typical in myeloma, this option describes only a component and not the overarching characteristic that defines the disease [2]. - Not all light chain presence indicates myeloma; a **monoclonal proliferation** of these light chains is what is significant. *Bence Jones proteins* - **Bence Jones proteins** are **monoclonal light chains** excreted in the urine, a common finding in multiple myeloma [2]. - However, like the presence of light chains, this is a **consequence** or **manifestation** of the underlying monoclonal gammopathy, not the defining characteristic itself. *Hypergammaglobulinemia* - This term refers to an **elevated total level of immunoglobulins** in the blood, which can be **polyclonal** (diverse antibodies) or **monoclonal** in nature. - In multiple myeloma, the elevation is specifically due to a **monoclonal immunoglobulin**, making "monoclonal gammopathy" a more precise and defining term [1]. **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. 606-609. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 616-617.
Question 7: An elderly male patient presented with clinical symptoms and signs consistent with possible multiple myeloma. Electrophoresis shows an M spike, and immunofixation findings are shown below. Which of the following statements best corresponds to the findings?
- A. Multiple myeloma with increased IgM
- B. Multiple myeloma with increased IgG (Correct Answer)
- C. Multiple myeloma with increased IgA
- D. Waldenström macroglobulinemia
Explanation: ***Multiple myeloma with increased IgG*** - The immunofixation image shows a distinct, *monoclonal band (M spike)* in the **IgG lane (G)**, corresponding to the initial electrophoresis (ELP) M spike [1]. There is also a corresponding band in the **kappa light chain (K)** lane [1]. - The presence of a dominant band in IgG, along with a matching light chain (either kappa or lambda), indicates an **IgG monoclonal gammopathy**, which is characteristic of the most common type of multiple myeloma [1]. *Multiple myeloma with increased IgM* - This option would correspond to a strong, monoclonal band in the **IgM lane (M)**, which is not the case here. The 'M' lane in the image shows a faint/normal band, not an increased M spike. - Increased IgM monoclonal protein (M spike) is characteristic of **Waldenström macroglobulinemia**, not typically multiple myeloma [2]. *Multiple myeloma with increased IgA* - If the patient had IgA multiple myeloma, there would be a prominent monoclonal band in the **IgA lane (A)**, which is not observed in this immunofixation result. The 'A' lane shows a considerably smaller band compared to IgG. - IgA multiple myeloma is a less common subtype than IgG myeloma and would present with an IgA M spike [1]. *Waldenström macroglobulinemia* - Waldenström macroglobulinemia is characterized by a monoclonal gammopathy of the **IgM type**, which would present as a distinct M spike in the IgM lane [2]. - The immunofixation clearly shows an **IgG M spike**, ruling out Waldenström macroglobulinemia based on the type of monoclonal gammopathy [2]. **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. 608-609. [2] 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. 606-607.
Question 8: Which of the following amyloid forms is seen in secondary amyloidosis associated with chronic diseases?
- A. Amyloid light chain
- B. ATTR
- C. Amyloid beta (Aβ)
- D. AA amyloid (Correct Answer)
Explanation: ***Amyloid Associated Protein*** - This form is particularly linked with **secondary amyloidosis**, commonly seen in conditions like chronic infections or inflammatory diseases [1]. - It is derived from **serum amyloid A (SAA)** protein, which elevates in response to inflammation, leading to the accumulation of amyloid fibrils [1][2]. *ATTR* - Stands for **transthyretin amyloidosis**, associated with genetic mutations or aging, not typically related to chronic secondary causes. - Involves proteins that primarily affect the **heart** and **nervous system**, particularly distinct from secondary amyloid deposits. *Amyloid light chain* - Primarily associated with **primary amyloidosis (AL)**, resulting from monoclonal plasma cell disorders, differing from the context of chronic diseases. - Characterized by deposition of **light chains from immunoglobulins**, rather than the **serum amyloid A** found in secondary amyloidosis [1]. *Beta 2 Amyloid* - Refers to **beta-amyloid** peptide associated with **Alzheimer's disease**, unrelated to secondary amyloidosis or chronic inflammatory states. - It is associated more with **neurological** pathologies, specifically the formation of plaques, rather than systemic amyloid deposition. **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. 136-140. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 267-268.
Question 9: Which among the following statements is wrong?
- A. M components are detected in chronic myeloid leukemia. (Correct Answer)
- B. In 20% of myelomas, only light chains are produced.
- C. Light chains are synthesized in slight excess normally in plasma cells.
- D. Qualitative assessment of M component can be done by electrophoresis.
Explanation: ***M components are detected in chronic myeloid leukemia.*** - This statement is **incorrect**. M-components (monoclonal proteins) are characteristic of **plasma cell dyscrasias** such as multiple myeloma, MGUS, and Waldenström macroglobulinemia [1]. - **Chronic myeloid leukemia (CML)** is a myeloproliferative neoplasm involving the granulocytic cell line, not plasma cells. CML does not produce M-components unless there is a **coincidental and unrelated plasma cell disorder**. - M-components arise from clonal proliferation of plasma cells producing a single type of immunoglobulin, which is not a feature of CML pathophysiology [2]. *Qualitative assessment of M component can be done by electrophoresis.* - This statement is correct. **Serum protein electrophoresis (SPEP)** is the primary tool for qualitative detection of M-components. - It provides qualitative information by demonstrating the presence of a monoclonal spike and its migration pattern in the gamma, beta, or alpha regions. - While SPEP also provides quantitative data (size/concentration), **immunofixation electrophoresis (IFE)** is subsequently used for specific typing of the heavy chain (IgG, IgA, IgM) and light chain (kappa or lambda). *In 20% of myelomas, only light chains are produced.* - This statement is correct. Approximately **15-20% of multiple myeloma cases** produce only monoclonal light chains without intact heavy chains [1]. - These are called **light chain myelomas**, and the light chains (Bence Jones proteins) are detected in urine and serum [2]. *Light chains are synthesized in slight excess normally in plasma cells.* - This statement is correct. Normal plasma cells produce a **slight excess of light chains** compared to heavy chains to ensure proper immunoglobulin assembly. - The excess free light chains are normally cleared by the kidneys, maintaining a balanced serum free light chain ratio (kappa/lambda ratio of 0.26-1.65). **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. 606-609. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 616-617.
Question 10: Bone marrow biopsy shows increased plasma cells with 'clock-face' chromatin pattern and perinuclear halo. Diagnosis?
- A. MGUS
- B. Plasmacytoma
- C. Multiple myeloma (Correct Answer)
- D. Waldenstrom's macroglobulinemia
Explanation: ***Multiple myeloma*** - The presence of increased **plasma cells** with a distinctive **'clock-face' chromatin pattern** and **perinuclear halo** on bone marrow biopsy is a classic histological feature of multiple myeloma [1]. - These morphological characteristics are indicative of **malignant plasma cell proliferation**, which is the hallmark of this condition [1]. *MGUS (Monoclonal Gammopathy of Undetermined Significance)* - While MGUS also involves a monoclonal plasma cell population, the bone marrow biopsy typically shows a **plasma cell infiltration rate of less than 10%** [1]. - The criteria for MGUS do not usually include a high enough burden of atypical plasma cells to cause significant organ damage or the characteristic histological features seen in myeloma. *Plasmacytoma* - A plasmacytoma is a localized proliferation of plasma cells, which can be solitary bone plasmacytoma or extramedullary [2]. - While the neoplastic plasma cells within a plasmacytoma would exhibit these features, the term plasmacytoma refers to a **single lesion**, whereas the biopsy in the question suggests a systemic involvement implied by "increased plasma cells" as a general finding rather than a specific focal lesion [2]. *Waldenstrom's macroglobulinemia* - This condition is characterized by a proliferation of **lymphoplasmacytic cells** (cells with features of both lymphocytes and plasma cells) that secrete **monoclonal IgM** [2]. - The bone marrow biopsy often shows an infiltrate of these lymphoplasmacytic cells, which are distinct from the predominantly mature plasma cells with typical 'clock-face' chromatin seen in multiple myeloma [2]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 616-618. [2] 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. 606-608.
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