DPM Podiatric Pathology

Question 1

What is the most common benign soft tissue tumor found in the foot?

Accepted Answer

Lipoma

Answer

A lipoma is a benign tumor composed of mature fat cells, making it the most common benign soft tissue tumor found in the body, including the foot. These tumors are typically soft, movable, and painless, growing slowly over time. While other benign tumors can occur, lipomas are statistically the most prevalent in the soft tissues of the foot.

Question 2

Which pathogen is most commonly associated with plantar warts?

Accepted Answer

Human papillomavirus

Answer

Plantar warts, which are common lesions on the soles of the feet, are caused by an infection with the Human papillomavirus (HPV). Specific strains of HPV, particularly types 1, 2, 4, and 63, are responsible for these growths. The virus enters the skin through small cuts or abrasions, leading to the characteristic rough, grainy texture of the wart.

Question 3

Which condition is characterized by the triad of arthritis, urethritis, and conjunctivitis and can affect the foot?

Accepted Answer

Reactive arthritis

Answer

Reactive arthritis is an autoimmune condition triggered by an infection elsewhere in the body, often gastrointestinal or genitourinary. It is classically characterized by the triad of arthritis (inflammation of joints, commonly affecting the feet and ankles), urethritis (inflammation of the urethra), and conjunctivitis (inflammation of the eyes). This specific combination of symptoms distinguishes it from other forms of arthritis.

Question 4

Which bone tumor is most often found in the metaphyseal region of long bones and may involve the calcaneus?

Accepted Answer

Chondroblastoma

Answer

Chondroblastoma is a rare, benign bone tumor that typically arises in the epiphysis or apophysis of long bones, but can extend into the metaphysis. While it's most common in the knee and shoulder, it can also involve the calcaneus (heel bone) in the foot. Its characteristic location in the metaphyseal region of long bones, including those of the foot, makes it a key diagnostic consideration.

Question 5

What histological feature is most characteristic of diabetic foot ulcers?

Accepted Answer

Necrosis with bacterial colonies

Answer

Diabetic foot ulcers are characterized by poor circulation, neuropathy, and impaired immune response, making them highly susceptible to infection. Histologically, these ulcers frequently show tissue necrosis (dead tissue) along with the presence of bacterial colonies, indicating a significant infectious component. This combination contributes to the slow healing and high risk of complications associated with diabetic foot ulcers.

(DPM) Doctor of Podiatric Medicine Practice Test

(DPM) Doctor of Podiatric Medicine Practice Test

DPM Podiatric Pathology