Bone and Soft Tissue Pathology Practice Questions

Q: Paget's disease is also known as -

Osteitis deformans. ***Osteitis deformans*** - **Paget's disease of bone** is classically known by its historical name, **osteitis deformans**, reflecting the bone deformities observed [1]. - This chronic bone disorder is characterized by accelerated bone remodeling, resulting in enlarged and misshapen bones [1], [2]. *Osteochondritis* - This term refers to **inflammation of bone and cartilage**, often due to overuse, trauma, or ischemia. - It does not describe Paget's disease, which involves a specific disorganization of bone remodeling rather than inflammation of cartilage. *Osteitis fibrosa cystica* - This condition is a skeletal manifestation of **severe hyperparathyroidism**, characterized by bone resorption and replacement with fibrous tissue and cysts. - While it involves bone changes, its etiology and pathological process are distinct from Paget's disease. *Osteomalacia* - **Osteomalacia** is a metabolic bone disease characterized by **defective mineralization of bone osteoid** in adults, primarily due to vitamin D deficiency [3]. - It leads to soft and weak bones, which is different from the disordered but often dense bone formation seen in Paget's 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. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 668-669.

Q: Bone mass is reduced in all of the following conditions EXCEPT:

Osteopetrosis. **Osteopetrosis** - **Osteopetrosis**, also known as **marble bone disease**, is a rare genetic disorder characterized by **increased bone density** due to defective osteoclast function. - In this condition, osteoclasts are unable to resorb bone, leading to an excessive accumulation of bone tissue, resulting in **densified but brittle bones**. *Osteoporosis* - **Osteoporosis** is characterized by significantly **reduced bone mass** and microarchitectural deterioration of bone tissue [1]. - This leads to increased bone fragility and a higher risk of fractures, as the bone becomes porous and weak [2]. *Hyperparathyroidism* - **Hyperparathyroidism** causes **increased bone resorption** due to excessive parathyroid hormone (PTH) secretion. - PTH mobilizes calcium from the bones, leading to a **decrease in bone density** and potential bone cysts (**osteitis fibrosa cystica**) [3]. *Osteomalacia* - **Osteomalacia** is a condition where there is **defective mineralization of bone osteoid**, leading to softer bones [4]. - While the bone mass might appear structurally normal, the **mineral content is reduced**, making the bone weak and susceptible to bowing and fractures. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1189-1191. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 665-666. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, p. 1194. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1194-1195.

Q: Ewing's sarcoma is characterized by:

Small round blue cell tumor with CD99 positivity. ***Ewing's sarcoma is characterized by:*** - **Small round blue cell tumor** with characteristic **CD99 positivity** on immunohistochemistry. - Presence of **t(11;22) translocation**, which leads to the **EWS-FLI1 fusion protein**. *Osteoid formation by malignant cells* - This is a hallmark feature of **osteosarcoma**, where malignant osteoblasts directly produce **osteoid** [1]. - **Ewing's sarcoma** does not produce osteoid; it's a primitive neuroectodermal tumor. *Cartilage matrix production* - This is characteristic of **chondrosarcoma**, a malignant tumor of cartilage-forming cells [2]. - **Ewing's sarcoma** is a bone tumor of different cellular origin and does not produce cartilage. *Giant cell proliferation* - While giant cells can be present in some bone tumors, **prominent giant cell proliferation** is primarily seen in **giant cell tumors of bone**, which are typically benign but locally aggressive. - **Ewing's sarcoma** is a small round blue cell tumor and not characterized by abundant giant cells. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 673-674. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1204-1205.

Q: All are predisposing factors of Osteogenic sarcoma except

Viral infection. ***Viral infection*** - **Viral infections** are generally not considered a direct predisposing factor for osteogenic sarcoma (osteosarcoma). - While some viruses are linked to certain cancers, there's no strong established causal link between common viral infections and osteosarcoma development. *Radiation* - **Therapeutic radiation** exposure, particularly at high doses or in children, is a recognized risk factor for developing secondary osteosarcoma. - Radiation can induce DNA damage and mutations in bone cells, leading to malignant transformation years after exposure. *Pagets disease of bone* - **Paget's disease of bone** is a chronic bone disorder characterized by abnormal bone remodeling, and it significantly increases the risk of developing osteosarcoma, especially in older individuals [1]. - The rapid and disorganized bone turnover in Paget's disease [1] creates an environment prone to malignant change. *Bone infection* - **Chronic osteomyelitis** (bone infection) has been implicated as a predisposing factor for the development of secondary osteosarcoma, particularly in rare cases. - Chronic inflammation and tissue damage associated with long-standing bone infections may contribute to malignant transformation. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1191-1192.

Q: Most common benign tumor of bone:

Osteochondroma. ***Osteochondroma*** - **Osteochondroma** is the **most common benign bone tumor**, accounting for approximately 35-40% of all benign bone tumors [2]. - It arises from the growth plate and is characterized by a cartilage cap covering a bony stalk, typically affecting the **metaphysis** of long bones [1], [2]. *Bone cyst* - **Unicameral bone cysts** (simple bone cysts) and aneurysmal bone cysts are common benign bone lesions, but they are not true tumors. - They are typically fluid-filled lesions that can weaken the bone, predisposing to **pathological fractures**. *Osteoblastoma* - **Osteoblastoma** is a rare benign bone tumor, much less common than osteochondroma [3]. - It is characterized by the production of **osteoid** and **woven bone** and often causes pain due to its richly innervated nature [3]. *Chordoma* - **Chordoma** is a rare, malignant bone tumor, not benign. - It arises from remnants of the **notochord** and typically occurs at the sacrococcygeal region, skull base, or vertebral column. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 672-673. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, p. 1202. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, p. 1200.

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: 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.

Question 1

Paget's disease is also known as -

Accepted Answer

Osteitis deformans

Answer

Osteochondritis

Answer

Osteitis fibrosa cystica

Answer

Osteomalacia

Question 2

Bone mass is reduced in all of the following conditions EXCEPT:

Accepted Answer

Osteopetrosis

Answer

Osteoporosis

Answer

Hyperparathyroidism

Answer

Osteomalacia

Question 3

Which of the following terms is MOST appropriate for growth of bone?

Accepted Answer

Apposition

Answer

Increase in size (Enlargement)

Answer

Hypertrophy

Answer

Hyperplasia

Question 4

Ewing's sarcoma is characterized by:

Accepted Answer

Small round blue cell tumor with CD99 positivity

Answer

Osteoid formation by malignant cells

Answer

Cartilage matrix production

Answer

Giant cell proliferation

Question 5

All are predisposing factors of Osteogenic sarcoma except

Accepted Answer

Viral infection

Answer

Radiation

Answer

Paget's disease of bone

Answer

Bone infection

Question 6

Most common benign tumor of bone:

Accepted Answer

Osteochondroma

Answer

Bone cyst

Answer

Osteoblastoma

Answer

Chordoma

Question 7

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 8

In pseudogout, material deposited is

Accepted Answer

Calcium pyrophosphate

Answer

Sodium oxalate

Answer

Monosodium urate

Answer

Calcium apatite

Question 9

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 10

Osteogenic sarcoma arises from -

Accepted Answer

Metaphysis

Answer

Epiphysis

Answer

Epiphyseal cortex

Answer

Growth plate

Bone and Soft Tissue Pathology — MCQs

Bone and Soft Tissue Pathology — MCQs

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