Bone and Soft Tissue Pathology Practice Questions

Q: Following are features of Paget's disease except -

Lowered serum alkaline phosphatase. ***Lowered serum alkaline phosphatase*** - Paget's disease is characterized by markedly **increased bone turnover**, involving both excessive bone resorption and disorganized bone formation. - This high bone formation activity leads to a significant **elevation in serum alkaline phosphatase (ALP)**, not a lowering, making this the incorrect feature [1]. *Increased Urinary excretion of hydroxyproline* - **Hydroxyproline** is a major component of **collagen**, and its urinary excretion is a marker of **collagen degradation** and bone resorption. - In Paget's disease, there is rapid and chaotic bone remodeling, leading to increased breakdown of collagen and thus **elevated urinary hydroxyproline**. *Deformity of bones* - The disorganized and rapid bone remodeling in Paget's disease results in structurally unsound and **enlarged, weakened bones**. - This often leads to **bone deformities**, bowing of long bones, and an increased risk of fractures due to the abnormal bone architecture [1], [2]. *Secondary osteosarcoma* - Paget's disease is a significant risk factor for the development of **secondary osteosarcoma**, a rare but aggressive bone cancer. - While most cases of Paget's disease do not progress to malignancy, the chronic and intense bone remodeling activity can predispose to malignant transformation, particularly in areas of long-standing disease. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1191-1194. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 660-661.

Q: In pseudogout, material deposited is

Calcium pyrophosphate. ***Calcium pyrophosphate*** - Pseudogout, also known as **calcium pyrophosphate deposition (CPPD) disease**, is characterized by the deposition of **calcium pyrophosphate dihydrate (CPPD)** crystals in joints [1]. - These crystals can lead to acute inflammatory arthritis, mimicking gout, but are chemically distinct from urate crystals [1]. *Sodium oxalate* - **Sodium oxalate** crystals are not typically associated with joint deposition diseases like pseudogout or gout. - Oxalate is more commonly involved in the formation of **kidney stones (calcium oxalate stones)** and can cause systemic oxalosis in rare metabolic disorders. *Monosodium urate* - **Monosodium urate (MSU)** crystals are the hallmark of **gout**, a different form of inflammatory arthritis [2, 4]. - MSU crystal deposition occurs due to **hyperuricemia** and leads to recurrent episodes of acute arthritis, commonly affecting the **first metatarsophalangeal joint** [2, 4]. *Calcium apatite* - **Calcium apatite** crystals (basic calcium phosphate crystals) are associated with **hydroxyapatite deposition disease (HADD)**, which can cause periarticular inflammation and calcific tendinitis, especially in the shoulder. - While it also involves calcium, it is distinct from the **calcium pyrophosphate** crystals found in pseudogout. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 683-684. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1218-1220. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 682-683.

Q: Not true about osteoarthritis

DIP joint is spared. ***DIP joint is spared*** - This statement is **incorrect** because **distal interphalangeal (DIP) joints** are commonly affected in osteoarthritis. - In fact, the presence of **Heberden's nodes** (at the DIP joints) and **Bouchard's nodes** (at the PIP joints) are characteristic features of osteoarthritis. *Narrowing of joint space* - **Joint space narrowing** is a hallmark radiological feature of osteoarthritis, resulting from **cartilage loss**. - This loss of articular cartilage leads to bones rubbing against each other, causing pain and further damage [2]. *Non-Inflammatory condition* - Osteoarthritis is primarily considered a **degenerative disease** rather than a pure inflammatory one, though inflammation can play a secondary role [1]. - The dominant pathology involves the breakdown of **articular cartilage** and changes in the bone below [1], [2]. *Most common joint disease* - Osteoarthritis is indeed the **most prevalent form of arthritis** and a leading cause of disability worldwide. - It affects millions of people, particularly with increasing age, due to wear and tear on the joints [2]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 675-676. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1210-1212.

Q: Leisegang rings are found in:

Calcifying epithelial odontogenic tumor. ***Calcifying epithelial odontogenic tumor*** - **Leisegang rings** are pathognomonic for **Calcifying Epithelial Odontogenic Tumor (CEOT)**, also known as Pindborg tumor. These rings represent **concentric rings of calcification**. - Histologically, CEOT features polyhedral epithelial cells within a fibrous stroma, often forming amyloid-like deposits that then calcify to form the characteristic rings. *Odontoma* - An **odontoma** is a benign odontogenic tumor composed of well-differentiated dental tissues (enamel, dentin, cementum, pulp) [1]. - It does not exhibit **Leisegang rings** but rather organized or disorganized masses of tooth-like structures. *Calcifying epithelial odontogenic cyst* - This is not a recognized entity; the correct term for a calcifying odontogenic lesion with cystic features is a **calcifying cystic odontogenic tumor (CCOT)**, formerly known as Gorlin cyst. - CCOT is characterized by ghost cells and dysplastic dentin, not **Leisegang rings**. *Primordial cyst* - A **primordial cyst** is an outdated term, typically referring to a **keratocystic odontogenic tumor (KCOT)** or sometimes a **dentigerous cyst**. - These cysts are characterized by a lining of stratified squamous epithelium and do not contain **Leisegang rings**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Head and Neck, pp. 741-742.

Q: Osteogenic sarcoma arises from -

Metaphysis. ***Metaphysis*** - **Osteogenic sarcoma (osteosarcoma)** most commonly originates in the **metaphysis** of long bones [2] due to the high rate of cell proliferation and bone turnover in this region during growth. - The **metaphysis** is the wide portion of a long bone between the epiphysis and the diaphysis, containing the growth plate historically. *Epiphysis* - The **epiphysis** is the end part of a long bone, initially separated from the main bone by cartilage but later fusing with it. - Tumors like **chondroblastoma** or **giant cell tumor (GCT)** are more commonly found in the epiphysis [1], not osteosarcoma. *Epiphyseal cortex* - The **epiphyseal cortex** refers to the outer layer of the epiphyseal bone. - While bone tumors can arise from cortical bone, the metaphysis as a whole is the primary site of origin for osteosarcoma. *Growth plate* - The **growth plate (physis)** is a cartilage plate responsible for longitudinal growth of bones. - While its rapid cellular activity is a factor in metaphyseal tumor formation, osteosarcoma arises from the bone tissue **adjacent to or within** the metaphysis, not directly from the cartilaginous growth plate itself. **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. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 671-672.

Q: What is the most common structural location within the bone for conventional chondrosarcoma?

Intramedullary. ***Intramedullary*** - This is the **most common location** for conventional chondrosarcoma, accounting for approximately **75-85%** of cases [1]. - These tumors arise within the **medullary cavity** (central or intramedullary location) and grow expansively within the bone [1]. - They typically show lytic destruction with internal ring-and-arc or popcorn calcifications on imaging. - Conventional chondrosarcoma is synonymous with central or intramedullary chondrosarcoma [1]. *Periosteal* - Periosteal (surface) chondrosarcoma is a **rare subtype** accounting for only **1-2%** of chondrosarcomas. - These arise from the periosteum on the bone surface, not within the medullary cavity. - They have a better prognosis compared to conventional (intramedullary) chondrosarcoma. *Juxtacortical* - This refers to tumors arising at or near the **bone surface** (cortical region) [1]. - Peripheral/juxtacortical chondrosarcoma accounts for approximately **10-15%** of cases and is much less common than the central type. - Secondary chondrosarcoma arising from osteochondroma is an example of peripheral chondrosarcoma [1]. *Epiphyseal* - Chondrosarcoma **rarely arises in the epiphysis** of long bones. - Conventional chondrosarcoma typically involves the **metaphysis and diaphysis**, with predilection for flat bones (pelvis, ribs) and long bones (femur, humerus) [2]. - Epiphyseal location would be highly unusual for this tumor. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1202-1204. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 673-674.

Q: Osteoarthritis is associated with all of the following except -

Ca++deposition in joint space. ***Ca++deposition in joint space*** - **Calcium pyrophosphate dihydrate (CPPD) crystal deposition** in the joint space is characteristic of **pseudogout**, not osteoarthritis [1]. - While some **calcification** may occur in osteophytes, direct **calcium crystal deposition** in the synovial fluid is not a primary feature of osteoarthritis [1]. *Subchondral sclerosis* - **Subchondral sclerosis** refers to the increased bone density that occurs beneath the cartilage in areas of stress in osteoarthritis. - This is a common radiological finding in osteoarthritis, reflecting the bone's response to increased mechanical load. *Osteophyte formation* - **Osteophytes** (bone spurs) are bony projections that form along the joint margins in osteoarthritis [2]. - They are a hallmark feature of the disease, resulting from the body's attempt to repair and stabilize the damaged joint [2]. *Decreased joint space* - **Decreased joint space** on radiographs is a classic sign of osteoarthritis, indicating loss of articular cartilage thickness [2]. - As the cartilage erodes, the distance between the bones within the joint decreases. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 683-684. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1210-1212.

Q: All of the following produce osteoblastic secondaries except:

Multiple myeloma. ***Multiple myeloma*** - Multiple myeloma is a **plasma cell malignancy** that typically causes **osteolytic (bone-destroying) lesions** due to the activation of osteoclasts and inhibition of osteoblasts, rather than osteoblastic (bone-forming) metastases [1]. - The bone lesions are often described as **punched-out lesions** on imaging [1]. *Carcinoma of Prostate* - **Prostate cancer** is well-known for producing **osteoblastic (sclerotic)** bone metastases, characterized by new bone formation [2]. - This is mediated by factors secreted by prostate cancer cells that stimulate osteoblasts [2]. *Carcinoma of Breast* - **Breast cancer** metastases to bone can be **mixed osteoblastic and osteolytic**, but frequently present with an osteoblastic component, especially in advanced stages. - The type of bone lesion can be influenced by various signaling pathways between cancer cells and bone cells. *Carcinoid tumors* - **Carcinoid tumors**, particularly those of gastrointestinal origin, can cause **osteoblastic bone metastases**, sometimes presenting as sclerotic lesions. - While less common than prostate or breast cancer, they are recognized for their potential to induce bone formation. **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] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 501-502.

Q: A 15-year-old boy is injured while playing cricket. X-rays of the leg rule out a possible fracture. The radiologist reports the boy has evidence of aggressive bone tumor with both bone destruction and soft tissue mass. The bone biopsy reveals a bone cancer with neural differentiation. Which of the following is the most likely diagnosis?

Ewing's sarcoma. ***Ewing's sarcoma*** - This is an aggressive bone tumor that commonly affects children and adolescents, characterized by **bone destruction** and a **soft tissue mass**. - A key diagnostic feature is its **neural differentiation**, often identified by the presence of a characteristic **t(11;22) translocation**. *Osteosarcoma* - While it is an aggressive bone tumor in adolescents, it primarily demonstrates **osteoid production** rather than neural differentiation [1]. [2] - X-rays typically show a **sunburst appearance** and **Codman's triangle**, which are not specified here [1]. *Neuroblastoma* - This is a pediatric malignancy of the **sympathetic nervous system** that can metastasize to bone, but it originates from neural crest cells and is not primarily a bone tumor. - While it shows neural differentiation, the primary tumor is usually in the **adrenal gland** or sympathetic ganglia, not directly arising from bone. *Chondroblastoma* - This is a rare, benign cartilaginous tumor typically found in the **epiphyses of long bones** in adolescents but is not generally aggressive or associated with neural differentiation. - It involves **cartilage formation**, which is distinct from the aggressive bone destruction and neural features described [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1200-1202. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 673-674.

Question 1

Following are features of Paget's disease except -

Accepted Answer

Lowered serum alkaline phosphatase

Answer

Increased Urinary excretion of hydroxyproline

Answer

Deformity of bones

Answer

Secondary osteosarcoma

Question 2

In pseudogout, material deposited is

Accepted Answer

Calcium pyrophosphate

Answer

Sodium oxalate

Answer

Monosodium urate

Answer

Calcium apatite

Question 3

Not true about osteoarthritis

Accepted Answer

DIP joint is spared

Answer

Narrowing of joint space

Answer

Non-Inflammatory condition

Answer

Most common joint disease

Question 4

Leisegang rings are found in:

Accepted Answer

Calcifying epithelial odontogenic tumor

Answer

Odontoma

Answer

Calcifying epithelial odontogenic cyst

Answer

Primordial cyst

Question 5

Osteogenic sarcoma arises from -

Accepted Answer

Metaphysis

Answer

Epiphysis

Answer

Epiphyseal cortex

Answer

Growth plate

Question 6

What is the most common structural location within the bone for conventional chondrosarcoma?

Accepted Answer

Intramedullary

Answer

Juxtacortical

Answer

Epiphyseal

Answer

Periosteal

Question 7

Osteoarthritis is associated with all of the following except -

Accepted Answer

Ca++deposition in joint space

Answer

Subchondral sclerosis

Answer

Osteophyte formation

Answer

Decreased joint space

Question 8

All of the following produce osteoblastic secondaries except:

Accepted Answer

Multiple myeloma

Answer

Carcinoma of Prostate

Answer

Carcinoma of Breast

Answer

Carcinoid tumors

Question 9

True about bone tumor is:

Accepted Answer

Multiple myeloma is seen in more than 55 years of age and above

Answer

Osteoclastoma- fifth decade

Answer

Osteogenic sarcoma-fourth decade

Answer

Chondrosarcoma -first decade

Question 10

A 15-year-old boy is injured while playing cricket. X-rays of the leg rule out a possible fracture. The radiologist reports the boy has evidence of aggressive bone tumor with both bone destruction and soft tissue mass. The bone biopsy reveals a bone cancer with neural differentiation. Which of the following is the most likely diagnosis?

Accepted Answer

Ewing's sarcoma

Answer

Osteosarcoma

Answer

Neuroblastoma

Answer

Chondroblastoma

Bone and Soft Tissue Pathology — MCQs

Bone and Soft Tissue Pathology — MCQs

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