Surgical Infections Practice Questions

Q: What is the most common clinical presentation of actinomycosis?

Cervicofacial. **Explanation:** **Actinomycosis** is a chronic, granulomatous infection caused by *Actinomyces israelii*, a Gram-positive, anaerobic, non-acid-fast commensal bacterium normally found in the oral cavity, gastrointestinal tract, and female genital tract. **1. Why Cervicofacial is Correct:** The **cervicofacial** region is the most common site of involvement, accounting for approximately **50–60% of cases**. It typically presents as a "lumpy jaw"—a slow-growing, painless, woody-hard swelling at the angle of the mandible. The infection often follows dental procedures, trauma, or poor oral hygiene, allowing the bacteria to breach the mucosal barrier. **2. Analysis of Incorrect Options:** * **Abdominal (Option C):** This is the second most common site (approx. 20%). It usually involves the **ileocecal region** and often mimics appendicitis or a malignancy. It is frequently associated with a history of abdominal surgery or bowel perforation. * **Thoracic (Option B):** Accounting for about 15% of cases, it results from the aspiration of oropharyngeal secretions. It can mimic lung cancer or tuberculosis on imaging. * **Hepatic (Option D):** This is usually a secondary spread from an abdominal focus via the portal vein and is not the primary presentation. **3. NEET-PG High-Yield Pearls:** * **Pathognomonic Feature:** Presence of **"Sulfur Granules"** (yellowish clumps of bacteria) in the pus or sinus discharge. * **Clinical Behavior:** It is known for crossing anatomical tissue planes (disregarding fascial boundaries) and forming multiple external discharging sinuses. * **Microscopy:** Shows a "Sun-ray appearance" (radiating filaments). * **Treatment of Choice:** High-dose **Penicillin G** for a prolonged duration (6–12 months). Use Erythromycin or Tetracycline in penicillin-allergic patients.

Q: What is the classification of Type IIIc according to the Southam grading system?

Large volume of serosanguinous discharge. The **Southam grading system** is a clinical classification used to assess the severity of surgical site infections (SSIs) based on the nature and volume of wound discharge and the presence of inflammation. ### Explanation of the Correct Answer **Option B (Large volume of serosanguinous discharge)** is the correct definition for **Type IIIc**. In the Southam system, Type III is characterized by serosanguinous discharge. This is further sub-classified by duration and volume: * **IIIa:** Prolonged serosanguinous discharge. * **IIIb:** Intermittent serosanguinous discharge. * **IIIc:** Large volume of serosanguinous discharge. ### Why Other Options are Incorrect * **Option A (Erythema along sutures):** This corresponds to **Type I** (Minor inflammation/Redness). * **Option C (Prolonged serosanguinous discharge):** This corresponds to **Type IIIa**. * **Option D (Pus at one point):** This corresponds to **Type IV** (Minor clinical infection/Localized pus). ### High-Yield Facts for NEET-PG The Southam Grading is a frequent "match the following" or "direct recall" topic. Memorize this simplified table: | Grade | Clinical Feature | | :--- | :--- | | **Type 0** | Normal healing | | **Type I** | Erythema/Redness along sutures | | **Type II** | Erythema with induration | | **Type III** | Serosanguinous discharge (**IIIa:** Prolonged; **IIIb:** Intermittent; **IIIc:** Large volume) | | **Type IV** | Minor infection (Pus at one point 2cm or deep-seated) | **Clinical Pearl:** While the CDC classification (Superficial, Deep, Organ Space) is the gold standard for reporting SSIs, the Southam system remains high-yield for exams focusing on clinical wound assessment. Large volume serosanguinous discharge (IIIc) is often a precursor to wound dehiscence.

Q: Cytokines are secreted in sepsis and Systemic Inflammatory Response syndrome (SIRS) by which of the following?

Neutrophils. ### Explanation In the context of sepsis and Systemic Inflammatory Response Syndrome (SIRS), the body’s innate immune system is activated to release a cascade of inflammatory mediators. **Neutrophils** (along with macrophages and monocytes) are the primary cellular sources of cytokines. When triggered by Pathogen-Associated Molecular Patterns (PAMPs) or Damage-Associated Molecular Patterns (DAMPs), these leukocytes secrete pro-inflammatory cytokines such as **TNF-α, IL-1, and IL-6**. These mediators are responsible for the systemic manifestations of SIRS, including fever, tachycardia, and vasodilation. **Analysis of Incorrect Options:** * **B. Adrenal gland:** While the adrenal glands are crucial in the stress response (secreting cortisol and catecholamines like adrenaline), they do not primarily secrete cytokines. Cortisol actually functions to *downregulate* the cytokine response. * **C. Platelets:** Platelets are primarily involved in hemostasis and the release of growth factors (like PDGF). While they interact with leukocytes, they are not the principal source of the systemic cytokines defining SIRS. * **D. Collecting duct:** This is a functional unit of the kidney involved in water reabsorption and electrolyte balance; it has no role in cytokine production during sepsis. **NEET-PG High-Yield Pearls:** * **TNF-α (Tumor Necrosis Factor-alpha):** The first and most important cytokine released in the systemic inflammatory response. * **IL-6:** The primary cytokine responsible for inducing the **Acute Phase Response** (e.g., stimulating the liver to produce CRP). * **SIRS Criteria:** Defined by abnormalities in temperature, heart rate, respiratory rate, and WBC count (often driven by neutrophil activity). * **Macrophage:** Often considered the "master orchestrator" of the cytokine storm alongside neutrophils.

Q: An abscess that arises from a tuberculous origin is known as which of the following?

Cold abscess.. **Explanation:** A **Cold Abscess** is a hallmark clinical presentation of tuberculosis (TB). Unlike pyogenic abscesses, which are characterized by the classic signs of inflammation—heat, redness, and pain—a tuberculous abscess lacks these features because it does not trigger an acute inflammatory response. It is formed by the liquefaction necrosis (caseation) of tuberculous granulomas, most commonly occurring in the cervical lymph nodes or as a result of spinal tuberculosis (Pott’s disease). **Analysis of Options:** * **Cold Abscess (Correct):** It is "cold" because there is no overlying warmth or erythema. It is typically fluctuant and may eventually track to the skin. * **Collar Stud Abscess:** This is a specific *stage* of a cold abscess. It occurs when a deep-seated tuberculous lymph node ruptures through the deep fascia, creating a superficial collection connected to the deep one by a narrow track. While related to TB, "Cold Abscess" is the broader term for the origin itself. * **Cystic Hygroma:** A congenital multilocular lymphatic malformation, usually found in the posterior triangle of the neck in children. It transilluminates brilliantly. * **Laryngocele:** A dilatation of the laryngeal saccule filled with air (or mucus). It presents as a neck swelling that increases in size with increased endolaryngeal pressure (e.g., Valsalva maneuver). **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Cervical lymph nodes (Scrofula). * **Pott’s Disease:** A cold abscess in the lumbar spine may track down the psoas sheath to present as a swelling in the groin (**Psoas Abscess**). * **Management:** Never perform simple Incision and Drainage (I&D) for a cold abscess, as it leads to a persistent **non-healing sinus**. The preferred treatment is aspiration through healthy skin (Z-track technique) and Anti-Tubercular Therapy (ATT).

Q: Pain associated with a psoas abscess is typically relieved by which position of the hip?

Flexion. **Explanation:** The **psoas muscle** originates from the transverse processes and bodies of the T12–L5 vertebrae and inserts into the lesser trochanter of the femur. It is the primary flexor of the hip joint. **1. Why Flexion is Correct:** When an abscess develops within the psoas fascia, the muscle becomes inflamed and irritated. **Flexion** of the hip shortens the psoas muscle, thereby reducing the tension on the inflamed fibers and decreasing intra-abdominal pressure within the psoas sheath. This "position of ease" provides significant pain relief to the patient. **2. Why Incorrect Options are Wrong:** * **Extension:** This is the most painful movement. Extending the hip stretches the inflamed psoas muscle. This is the basis of the **"Psoas Sign"** (pain on passive hip extension), a classic physical exam finding. * **Adduction and Abduction:** These movements are primarily governed by the medial and gluteal muscle groups, respectively. While they may cause minor discomfort due to secondary pelvic movement, they do not directly alter the tension of the psoas muscle as significantly as flexion or extension. **Clinical Pearls for NEET-PG:** * **Psoas Sign:** Pain on passive extension of the right hip; indicates irritation of the psoas muscle (commonly seen in retrocecal appendicitis or psoas abscess). * **Triad of Psoas Abscess:** Fever, flank pain, and limitation of hip movement (flexion deformity). * **Etiology:** Historically associated with **Pott’s disease** (Tuberculosis of the spine), but currently, *Staphylococcus aureus* is the most common causative organism in primary cases. * **Investigation of Choice:** **CT scan** is the gold standard for diagnosis and can facilitate percutaneous drainage.

Q: Antibioma is best treated by?

Complete resection. **Explanation:** An **Antibioma** is a tough, fibrous mass that forms when an acute abscess is treated with antibiotics without prior surgical drainage. The antibiotics sterilize the pus or suppress the infection, but the body reacts by walling off the area with dense fibrous tissue, resulting in a painless or mildly tender, firm, non-fluctuant swelling. **Why Complete Resection is the Correct Answer:** Once an antibioma has formed, the thick, avascular fibrous capsule prevents further antibiotic penetration. Since the contents are often organized or semi-solid rather than liquid pus, simple drainage is usually ineffective. **Complete surgical excision (resection)** of the entire mass along with its capsule is the definitive treatment to ensure resolution and prevent recurrence. **Analysis of Incorrect Options:** * **Partial Resection:** This is avoided as it leaves behind infected or necrotic tissue and the fibrous capsule, which can lead to chronic sinus formation or recurrence. * **Aspiration:** Antibiomas are solid or semi-solid masses with thick walls. Aspiration typically fails because the contents are too thick to pass through a needle and the capsule will not collapse. * **Administration of Antibiotics:** This is the original cause of the condition. Further antibiotics cannot penetrate the dense, poorly vascularized fibrous wall, making medical management ineffective at this stage. **Clinical Pearls for NEET-PG:** * **Common Site:** Most frequently encountered in the **breast** (following inadequate treatment of a breast abscess). * **Clinical Mimic:** In the breast, an antibioma can clinically mimic a **carcinoma** due to its firm, fixed nature; hence, excision and biopsy are crucial. * **Prevention:** The gold standard for abscess management is always **Incision and Drainage (I&D)**; antibiotics should be an adjunct, not a replacement for drainage.

Question 1

What is the most common clinical presentation of actinomycosis?

Accepted Answer

Cervicofacial

Answer

Thoracic

Answer

Abdominal (right iliac fossa)

Answer

Hepatic

Question 2

Phlegmon; all are true except?

Accepted Answer

It is a rapidly spreading infection of subcutaneous tissue due to micro-organisms like staphylococci.

Answer

The tissue is tender, painful, and hard to touch.

Answer

Pain, fever, and malaise are aggressive.

Answer

Is caused due to micro-organisms which are capable of producing hyaluronidase that breaks down the intercellular cementing substance hyaluronic acid.

Question 3

What is the classification of Type IIIc according to the Southam grading system?

Accepted Answer

Large volume of serosanguinous discharge

Answer

Erythema along sutures

Answer

Prolonged serosanguinous discharge

Answer

Pus at one point

Question 4

Cytokines are secreted in sepsis and Systemic Inflammatory Response syndrome (SIRS) by which of the following?

Accepted Answer

Neutrophils

Answer

Adrenal gland

Answer

Platelets

Answer

Collecting duct

Question 5

An abscess that arises from a tuberculous origin is known as which of the following?

Accepted Answer

Cold abscess.

Answer

Cystic hygroma.

Answer

Collar stud abscess.

Answer

Laryngocele.

Question 6

Pain associated with a psoas abscess is typically relieved by which position of the hip?

Accepted Answer

Flexion

Answer

Extension

Answer

Adduction

Answer

Abduction

Question 7

Following a boating injury in an industrial-use river, a patient presents with fever, tachycardia, and a rapidly expanding area of erythema, blistering, and drainage from a flank wound. An x-ray shows gas in the soft tissues. Which of the following measures is most appropriate?

Accepted Answer

Wide debridement

Answer

Administration of an antifungal agent

Answer

Administration of antitoxin

Answer

Administration of hyperbaric oxygen

Question 8

Which organism is responsible for the destruction of skin grafts?

Accepted Answer

Streptococcus

Answer

Staphylococcus

Answer

Pseudomonas

Answer

Clostridium

Question 9

Which of the following is NOT considered a risk factor for developing Surgical Site Infections (SSIs)?

Accepted Answer

General anesthesia

Answer

Prolonged duration of procedure

Answer

Malnutrition

Answer

Bacterial contamination

Question 10

Antibioma is best treated by?

Accepted Answer

Complete resection

Answer

Partial resection

Answer

Aspiration

Answer

Administration of antibiotics

Surgical Infections — MCQs

Surgical Infections — MCQs

On this page

Practice by Chapter

Want unlimited practice?