Bone and Soft Tissue Pathology Practice Questions

Q: Which of the following cancers is associated with osteolytic metastases?

All of the options. ***All of the options*** - **Lung**, **kidney**, and **thyroid** cancers are all known to frequently produce **osteolytic bone metastases** [1]. - These cancers release factors that stimulate **osteoclast activity**, leading to bone destruction rather than new bone formation. *Lung* - **Non-small cell lung cancer** often metastasizes to bone and commonly causes **osteolytic lesions** [2]. - Bone metastases are a frequent complication, particularly in advanced stages, and are associated with **pain** and **pathological fractures**. *Kidney* - **Renal cell carcinoma** is notorious for causing highly vascularized and often **osteolytic metastases** in bone [1]. - These lesions can be aggressive, leading to significant **bone destruction** and **hypercalcemia**. *Thyroid* - **Follicular thyroid carcinoma** and, less commonly, **papillary thyroid carcinoma** are known to cause **osteolytic bone metastases** [1]. - Thyroid cancer metastases in bone can be slow-growing but are typically **destructive** and may cause **pain** or **fractures**. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 671-672. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 724-725.

Q: Osteogenesis imperfecta is due to a defect in what?

Type I collagen. ***Collagen 1*** - Osteogenesis imperfecta is primarily caused by a defect in **type I collagen** [2], which is crucial for bone strength and structure. - This defect leads to **brittle bones**, resulting in frequent fractures and skeletal deformities . *Collagen 2* - Type II collagen is mainly found in **cartilage** and is critical for **hyaline cartilage formation**, not directly involved in bone integrity. - Defects in type II collagen are associated with conditions like **chondrodysplasia**, rather than osteogenesis imperfecta. *Collagen 4* - Type IV collagen is primarily found in **basement membranes** and plays a role in filtration and structural integrity of tissues. - While important for kidney and eye function, it is not related to the bone fragility seen in osteogenesis imperfecta. *Collagen 3* - Type III collagen is involved in the structure of **reticular fibers** and is crucial for skin and blood vessel integrity. - It is not the primary collagen affected in osteogenesis imperfecta, which is associated specifically with type I collagen defects. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, p. 1182. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, p. 1188.

Q: A five-year-old girl is brought to a pediatrician because she is developing breasts. Physical examination shows large hyperpigmented macules with irregular margins on one side of her back. Which of the following bony abnormalities would most likely be associated with these symptoms?

Multiple localized whorls of connective tissue. ***Multiple localized whorls of connective tissue*** - This constellation of symptoms (precocious puberty, hyperpigmented macules with irregular margins, and bony abnormalities) is characteristic of **McCune-Albright syndrome** [1]. - The bony abnormality associated with McCune-Albright syndrome is **fibrous dysplasia**, which is characterized by the replacement of normal bone with **fibrous tissue** and immature woven bone, often described as localized whorls of connective tissue [1]. *A combination of osteitis fibrosa cystica and osteomalacia* - **Osteitis fibrosa cystica** is associated with severe **hyperparathyroidism**, leading to bone resorption and cyst formation. - **Osteomalacia** results from defective mineralization of bone due to **vitamin D deficiency** or phosphate wasting, neither of which comprehensively explains the given symptoms. *A generalized thinning of bony spicules* - This description is characteristic of **osteoporosis**, a condition of reduced bone mass and structural deterioration, leading to increased fracture risk. - Osteoporosis is typically seen in older adults and is not directly associated with precocious puberty or café-au-lait spots. *Excessive bony deposition with obliteration of marrow* - This describes **osteopetrosis** (Albers-Schönberg disease), a genetic disorder characterized by abnormally dense bones due to defective osteoclast function. - While it affects bone, its presentation does not include precocious puberty or hyperpigmented macules. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1208-1209.

Q: What is the most common primary bone tumor in adults?

Chondrosarcoma. ***Chondrosarcoma*** - **Chondrosarcoma** is the **most common primary malignant bone tumor in adults**, typically affecting older individuals (over 40-50 years) [1]. - It arises from **cartilage-producing cells** and is characterized by the production of malignant cartilage matrix [1]. - Common sites include pelvis, femur, and shoulder girdle [2]. *Osteogenic sarcoma* - **Osteogenic sarcoma** (osteosarcoma) is the most common primary malignant bone tumor in **children and adolescents**, not adults overall [1]. - There is a second peak incidence in older adults, often associated with **Paget's disease** or prior radiation. - It arises from osteoblasts and produces immature bone (osteoid). *Adamantinoma* - **Adamantinoma** is a rare, low-grade malignant bone tumor that almost exclusively occurs in the **tibia**. - It has a characteristic biphasic histologic pattern with epithelial and osteofibrous components. *Ewing's sarcoma* - **Ewing's sarcoma** is the second most common primary malignant bone tumor in **children and young adults** (ages 5-25 years). - It is a highly aggressive tumor with specific chromosomal translocation t(11;22) and composed of **small round blue cells**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, p. 1204. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 673-674.

Q: Dupuytren's and Peyronie's diseases are both types of what?

Fibromatosis. ***Fibromatosis*** - **Dupuytren's contracture** involves the palmar fascia, leading to fixed flexion deformities of the fingers [1][2]. - **Peyronie's disease** affects the tunica albuginea of the penis, causing penile curvature and pain [2]. Both are characterized by **abnormal fibrous tissue accumulation** [2]. *Burn contracture* - This refers to the **tightening of skin** and underlying tissues after a burn injury, leading to limited range of motion. - It is a consequence of scar tissue formation post-trauma, not a primary proliferative fibrous condition. *Myalgias* - This term simply means **muscle aches or pain**, which is a symptom of many conditions and not a disease entity itself. - It does not involve the formation of abnormal fibrous tissue or contractures. *Fibroblastic hyperplasia* - While both conditions do involve the proliferation of fibroblasts, **fibroblastic hyperplasia** is a more general term for an increase in the number of fibroblasts. - **Fibromatosis** is a more specific classification that describes a group of conditions characterized by infiltrative growth of fibrous tissue, including Dupuytren's and Peyronie's [2]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 691-692. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1223-1224.

Q: Which type of cells are primarily involved in the infiltration seen in rheumatoid arthritis?

T-cells and B cells. ***T-cells*** - In rheumatoid arthritis, **T-cells** play a crucial role in the **pathogenesis**, contributing to inflammation and joint destruction [1]. - Activated **CD4+ T-cells** are particularly prominent, facilitating the inflammatory processes in the synovium [1]. *NK-cells* - While **Natural Killer (NK) cells** are involved in innate immunity, they are not the predominant infiltrating cells in rheumatoid arthritis. - The condition is primarily driven by **adaptive immune responses**, especially involving T-cells and antibodies. *B cells* - **B cells** contribute to the disease by producing antibodies, but they are not the primary cell type infiltrated [1]. - In rheumatoid arthritis, their role is more about antibody-mediated damage rather than being the dominant infiltrating cells. *Both B & T Cells* - Although both T and B cells are present in rheumatoid arthritis, **T-cells** are the specifically significant infiltrating cells associated with the inflammation. - The focus on **T-cells** highlights the specific adaptive immune response that characterizes this disease [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1212-1214.

Q: Which condition is characterized by normal serum calcium and alkaline phosphatase levels?

Cherubism. ***Cherubism*** - Characterized by **normal serum calcium** and **alkaline phosphatase levels**, distinguishing it from metabolic bone diseases. - Often presents with **bilateral mandibular expansion** and **fibrous dysplasia**, typically seen in pediatric patients. *Hyperparathyroidism* - Usually associated with **elevated serum calcium** levels due to increased parathyroid hormone (PTH) [2][3]. - Elevated **alkaline phosphatase** levels may also occur, indicating increased bone turnover. *Hypothyroidism* - Does not affect calcium levels directly, but can lead to **elevated alkaline phosphatase** due to secondary effects on bone metabolism. - Commonly associated with symptoms like **fatigue, weight gain**, and **cold intolerance**, not related to calcium levels. *Paget's disease* - Typically presents with **elevated alkaline phosphatase** due to increased osteoblastic activity and abnormal bone remodeling [1]. - Often leads to **bone pain** and deformities, which are not findings in cherubism [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1192-1194. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, pp. 1106-1107. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 667-668.

Q: What will be the likely cause of death in a 4-year-old boy who tires easily, exhibits weakness in the pelvic and shoulder girdles, and calf muscle enlargement, with elevated serum creatine kinase levels, and a biopsy showing marked variation in muscle fiber size and shape, muscle fiber necrosis, myophagocytosis, regenerating fibers, and fibrosis?

Respiratory failure/complications. ***Cardiomyopathy*** - In boys with **Duchenne muscular dystrophy (DMD)**, cardiomyopathy is a significant complication leading to **heart failure** and death. - The muscle biopsy findings support **muscular dystrophy** [1], and the patient's symptoms indicate weakening of the heart muscle over time. *End-stage renal disease* - Typically results from **chronic kidney conditions**, which are not indicated by the case presented. - The symptoms described, including **muscle weakness** and **fibrosis**, are not directly related to renal dysfunction. *Cerebrovascular disease* - Generally manifests as a sudden neurological deficit and is uncommon in **pediatric muscular conditions**. - There is no indication of **neurological symptoms** in this patient's presentation. *Pulmonary saddle embolism* - This condition typically presents with sudden **shortness of breath** or **chest pain**, neither of which is mentioned here. - The findings focus more on **muscle degeneration** rather than any acute pulmonary events. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Peripheral Nerves and Skeletal Muscles, pp. 1244-1245.

Q: Giant cells are a prominent characteristic feature of which of the following conditions?

Osteoclastoma. ***Osteoclastoma*** - Also known as **giant cell tumor of bone**, it is characterized by the presence of numerous **multinucleated giant cells** [1]. - These giant cells are derived from **osteoclasts**, indicating the aggressive nature of this tumor [1]. *Osteitis fibrosa cystica* - While it may show giant cells, they are less prominent and often associated with **hyperparathyroidism** affecting the bone. - This condition primarily involves **bone resorption** and **cyst formation**, not defined by giant cell formation. *Chordoma* - Chordomas are typically composed of **bizarre cells** with a characteristic **mucous** stroma and do not predominantly contain giant cells. - They arise from **notochord remnants**, primarily found in the axial skeleton, rather than from bone cells. *Chondroblastoma* - This tumor primarily features **chondroblasts** and small cellular components, not giant cells. - It is usually seen in young adults and commonly involves the **epiphyses of long bones**, showing a different histological pattern. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1205-1206.

Question 1

Which of the following cancers is associated with osteolytic metastases?

Accepted Answer

All of the options

Answer

Lung

Answer

Kidney

Answer

Thyroid

Question 2

Osteogenesis imperfecta is due to a defect in what?

Accepted Answer

Type I collagen

Answer

Type II collagen

Answer

Type IV collagen

Answer

Type III collagen

Question 3

A five-year-old girl is brought to a pediatrician because she is developing breasts. Physical examination shows large hyperpigmented macules with irregular margins on one side of her back. Which of the following bony abnormalities would most likely be associated with these symptoms?

Accepted Answer

Multiple localized whorls of connective tissue

Answer

Excessive bony deposition with obliteration of marrow

Answer

A combination of osteitis fibrosa cystica and osteomalacia

Answer

A generalized thinning of bony spicules

Question 4

What is the most common primary bone tumor in adults?

Accepted Answer

Chondrosarcoma

Answer

Ewing's sarcoma

Answer

Adamantinoma

Answer

Osteogenic sarcoma

Question 5

Dupuytren's and Peyronie's diseases are both types of what?

Accepted Answer

Fibromatosis

Answer

Burn contracture

Answer

Myalgias

Answer

Fibroblastic hyperplasia

Question 6

Which type of cells are primarily involved in the infiltration seen in rheumatoid arthritis?

Accepted Answer

T-cells and B cells

Answer

T-cells

Answer

B cells

Answer

NK-cells

Question 7

Which of the following represents the PRIMARY pathophysiological mechanism underlying age-related changes in articular cartilage?

Accepted Answer

Enzymatic degradation of proteoglycans is increased

Answer

Total water content of cartilage is decreased

Answer

Synthesis of proteoglycans is decreased

Answer

Total proteoglycan content is decreased

Question 8

Which condition is characterized by normal serum calcium and alkaline phosphatase levels?

Accepted Answer

Cherubism

Answer

Hypothyroidism

Answer

Hyperparathyroidism

Answer

Paget's disease

Question 9

What will be the likely cause of death in a 4-year-old boy who tires easily, exhibits weakness in the pelvic and shoulder girdles, and calf muscle enlargement, with elevated serum creatine kinase levels, and a biopsy showing marked variation in muscle fiber size and shape, muscle fiber necrosis, myophagocytosis, regenerating fibers, and fibrosis?

Accepted Answer

Respiratory failure/complications

Answer

Cerebrovascular complications

Answer

Chronic kidney disease

Answer

Pulmonary embolism

Question 10

Giant cells are a prominent characteristic feature of which of the following conditions?

Accepted Answer

Osteoclastoma

Answer

Chondroblastoma

Answer

Chordoma

Answer

Osteitis fibrosa cystica

Bone and Soft Tissue Pathology — MCQs

Bone and Soft Tissue Pathology — MCQs

On this page

Practice by Chapter

Want unlimited practice?