General Surgery Principles — MCQs

General Surgery Principles Indian Medical PG Practice Questions and MCQs

Question 741: In which one of the following types of hernia do the abdominal viscera protrude through a defect in the wall of the hernial sac?

A. Pantaloon hernia
B. Sliding hernia (Correct Answer)
C. Richter's hernia
D. Indirect inguinal hernia

Explanation: ### Explanation **Correct Answer: B. Sliding Hernia** **Mechanism:** A **Sliding Hernia (Hernie-en-glissade)** occurs when a retroperitoneal organ (most commonly the **sigmoid colon** on the left or the **cecum** on the right) drags its overlying peritoneum with it as it descends. Consequently, the organ itself forms part of the **posterior wall of the hernial sac**. In this condition, the viscera do not just sit inside the sac; they protrude through a defect in the wall because they *are* the wall. **Analysis of Incorrect Options:** * **A. Pantaloon Hernia:** This refers to the simultaneous presence of both a direct and an indirect inguinal hernia on the same side, separated by the inferior epigastric vessels. The viscera remain entirely within the sacs. * **C. Richter’s Hernia:** This involves the protrusion of only a **portion of the bowel wall** (circumference) through the hernial orifice. While it carries a high risk of strangulation without clinical signs of obstruction, the bowel does not form the sac wall. * **D. Indirect Inguinal Hernia:** This is a standard hernia where the sac is formed by the patent processus vaginalis, and the viscera are contained entirely within the peritoneal sac. **Clinical Pearls for NEET-PG:** * **Most common organ involved:** Bladder (in direct sliding hernias) or Sigmoid colon (in indirect sliding hernias). * **Surgical Caution:** The most important clinical implication is during surgery; if the surgeon mistakes the "wall" (the organ) for the "sac" and attempts to ligate it, it can lead to accidental bowel or bladder injury. * **Demographics:** Sliding hernias are more common in elderly males and are almost always **indirect** in nature.

Question 742: Secondary amyloidosis occurs in which of the following conditions?

A. Chronic osteomyelitis
B. Rheumatoid arthritis
C. Leprosy
D. All of the above (Correct Answer)

Explanation: **Explanation:** Secondary amyloidosis, also known as **AA amyloidosis**, occurs as a complication of chronic inflammatory conditions, chronic infections, or certain malignancies. The underlying pathophysiology involves the prolonged elevation of **Serum Amyloid A (SAA)**, an acute-phase reactant produced by the liver in response to cytokines like IL-1, IL-6, and TNF-alpha. Over time, SAA is proteolytically cleaved to form AA amyloid fibrils, which deposit in organs such as the kidneys, liver, and spleen. * **Chronic Osteomyelitis (Option A):** This is a classic infectious cause. Persistent bone infection leads to a sustained inflammatory state, triggering AA deposition. * **Rheumatoid Arthritis (Option B):** This is the most common cause of secondary amyloidosis in developed countries. The chronic autoimmune-mediated systemic inflammation drives the continuous production of SAA. * **Leprosy (Option C):** Specifically in the lepromatous form or during chronic erythema nodosum leprosum (ENL) reactions, leprosy serves as a potent infectious trigger for secondary amyloidosis. Since all three conditions are characterized by chronic inflammation or infection, they are all recognized etiologies. **High-Yield Clinical Pearls for NEET-PG:** * **Primary Amyloidosis (AL):** Associated with plasma cell dyscrasias (e.g., Multiple Myeloma); involves Light chain deposition. * **Secondary Amyloidosis (AA):** Associated with "Cr-In-Ma" (Chronic Inflammation, Infection, Malignancy). * **Commonest Organ Involved:** Kidney (presents as nephrotic syndrome). * **Diagnosis:** Congo Red stain shows **Apple-green birefringence** under polarized light. * **Biopsy Site:** Abdominal fat pad biopsy is the preferred screening test; Rectal biopsy is also highly sensitive.

Question 743: All are the features of rheumatoid arthritis except?

A. Osteosclerosis of joint (Correct Answer)
B. Soft tissue swelling
C. Narrowing of joint space
D. Periarticular osteoporosis

Explanation: **Explanation:** The hallmark of **Rheumatoid Arthritis (RA)** is chronic, symmetrical inflammatory synovitis. Because it is an **inflammatory** (non-weight-bearing) arthritis, it is characterized by bone loss rather than bone formation. **Why Option A is the Correct Answer:** **Osteosclerosis** (increased bone density/thickening) is a feature of **Osteoarthritis (OA)**, not RA. In OA, the mechanical stress on subchondral bone leads to sclerosis and osteophyte formation. In contrast, RA involves inflammatory cytokines (like TNF-α and IL-1) that activate osteoclasts, leading to bone erosion and decreased density. **Analysis of Incorrect Options:** * **B. Soft tissue swelling:** This is the earliest radiographic sign of RA, caused by synovial hypertrophy and effusion (pannus formation). * **C. Narrowing of joint space:** As the pannus destroys the articular cartilage, the space between the bones decreases symmetrically. * **D. Periarticular osteoporosis:** This is a classic early radiological feature of RA. Inflammatory hyperemia leads to local bone resorption near the affected joint before generalized bone loss occurs. **NEET-PG High-Yield Pearls:** * **Radiological Hallmarks of RA:** (1) Soft tissue swelling, (2) Periarticular osteopenia/osteoporosis, (3) Symmetrical joint space narrowing, and (4) Marginal erosions (Rat-bite erosions). * **Joints Spared:** RA typically **spares the Distal Interphalangeal (DIP) joints** and the thoracolumbar spine (except C1-C2). * **Key Deformities:** Swan-neck deformity, Boutonniere deformity, and Z-deformity of the thumb. * **Serology:** Anti-CCP (Cyclic Citrullinated Peptide) is more specific than Rheumatoid Factor (RF).

Question 744: Which of the following is NOT a risk factor for squamous cell carcinoma?

A. Ultraviolet radiation
B. Tar
C. Tobacco
D. Human papillomavirus (HPV) type 18 (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. Human papillomavirus (HPV) type 18**. In the context of Squamous Cell Carcinoma (SCC) of the **skin**, HPV types 16 and 18 are primarily associated with mucosal malignancies (like cervical, oropharyngeal, and anal cancers) rather than cutaneous SCC. While HPV types 5 and 8 are linked to skin SCC (especially in patients with Epidermodysplasia verruciformis), HPV 18 is a high-risk mucosal strain and is not considered a standard risk factor for general cutaneous SCC. **Analysis of Options:** * **A. Ultraviolet (UV) radiation:** This is the most significant risk factor for SCC. UV-B radiation causes direct DNA damage and mutations in the **p53 tumor suppressor gene**, leading to keratinocyte transformation. * **B. Tar:** Chemical carcinogens, including coal tar, soot (as seen in Percivall Pott’s chimney sweeps), and arsenic, are well-established triggers for skin SCC. * **C. Tobacco:** Smoking is a systemic risk factor for SCC, particularly of the lip, oral cavity, and lungs. It acts as a potent chemical carcinogen that impairs local immunity and promotes DNA damage. **Clinical Pearls for NEET-PG:** * **Marjolin’s Ulcer:** A highly aggressive SCC arising in chronic scars, non-healing ulcers, or burn sites. * **Precursor Lesions:** Actinic keratosis (most common) and Bowen’s disease (SCC in situ). * **Genetic Association:** Xeroderma Pigmentosum is a high-yield condition where defective nucleotide excision repair leads to early-onset SCC. * **HPV Strains:** Remember **HPV 6, 11** (Low risk - Warts) vs. **HPV 16, 18** (High risk - Cervical/Mucosal SCC).

Question 745: An ulcer with undermined edges is seen in which condition?

A. Malignant ulcer
B. Tubercular ulcer (Correct Answer)
C. Venous ulcer
D. Diabetic ulcer

Explanation: **Explanation:** The morphology of an ulcer's edge is a high-yield diagnostic feature in surgery. An **undermined edge** is the hallmark of a **Tubercular ulcer**. This occurs because the tubercular process (caseous necrosis) originates in the subcutaneous plane or lymph nodes. As the infection destroys the subcutaneous tissue more rapidly than the overlying skin, the skin edges are left hanging over the floor of the ulcer, creating a "pocket" or undermining effect. **Analysis of Options:** * **Malignant Ulcer (Option A):** Characteristically presents with **everted (rolled-out) edges**. This is due to the rapid proliferation of neoplastic cells at the periphery, which outgrows the center and spills over the normal skin. * **Venous Ulcer (Option B):** Typically presents with **sloping edges**. These are usually shallow ulcers found in the "gaiter area" (medial malleolus) and heal by the gradual inward migration of epithelium. * **Diabetic/Trophic Ulcer (Option D):** Characterized by **punched-out edges**. These are deep, circular ulcers resulting from repeated trauma to insensitive (neuropathic) skin, often seen on the sole of the foot. **High-Yield Clinical Pearls for NEET-PG:** * **Undermined edge:** Tuberculosis. * **Punched-out edge:** Syphilis (Gummatous ulcer), Deep Trophic/Diabetic ulcers. * **Everted edge:** Squamous cell carcinoma (Marjolin’s ulcer). * **Rolled-in/Beaded edge:** Basal cell carcinoma (Rodent ulcer). * **Sloping edge:** Healing traumatic or venous ulcer.

Question 746: Schwann cells are derived from:

A. Neural crest cells (Correct Answer)
B. Endoderm
C. Mesoderm
D. Ectoderm

Explanation: **Explanation:** The correct answer is **Neural crest cells**. Schwann cells are the primary glial cells of the peripheral nervous system (PNS), responsible for myelinating peripheral axons. During embryogenesis, the neural plate folds to form the neural tube; however, a specific population of cells at the "crests" of these folds migrates throughout the body. These **neural crest cells** are multipotent and give rise to various structures, including the sensory and autonomic ganglia, adrenal medulla, melanocytes, and Schwann cells. **Analysis of Incorrect Options:** * **Endoderm:** This layer primarily gives rise to the epithelial lining of the gastrointestinal and respiratory tracts, as well as organs like the liver and pancreas. * **Mesoderm:** This layer forms the "middle" structures, including muscles, bones, the circulatory system, dermis, and the urogenital system. * **Ectoderm:** While the nervous system originates from the ectoderm, it is specifically divided into the **surface ectoderm** (epidermis, lens) and **neuroectoderm**. The neuroectoderm further differentiates into the **neural tube** (CNS: brain, spinal cord, oligodendrocytes) and **neural crest cells** (PNS: Schwann cells). **Clinical Pearls for NEET-PG:** * **Schwannoma vs. Neurofibroma:** Both are nerve sheath tumors derived from Schwann cells. Schwannomas are typically encapsulated and push the nerve aside, while neurofibromas are unencapsulated and infiltrate the nerve. * **Myelination:** Remember that **Schwann cells** myelinate a single axon in the PNS, whereas **Oligodendrocytes** (derived from the neural tube) myelinate multiple axons in the CNS. * **Acoustic Neuroma:** This is a vestibular schwannoma (CN VIII) and is a classic high-yield association with Neurofibromatosis Type 2 (NF2).

Question 747: Which of the following muscles is not a hybrid muscle?

A. Pectoralis major
B. Extensor digitorum (Correct Answer)
C. Flexor digitorum profundus
D. Brachialis

Explanation: ### Explanation **Concept of Hybrid (Composite) Muscles** A **hybrid muscle** (also known as a composite muscle) is defined as a muscle that is supplied by more than one nerve. This dual nerve supply usually occurs because the muscle develops from more than one embryonic origin or spans different functional compartments. **Why Extensor Digitorum is the Correct Answer:** The **Extensor digitorum** is not a hybrid muscle. It is located in the posterior compartment of the forearm and is supplied solely by the **posterior interosseous nerve** (a branch of the radial nerve). It has a single functional role and a single nerve supply. **Analysis of Incorrect Options:** * **Pectoralis major:** It is a hybrid muscle supplied by both the **medial and lateral pectoral nerves**. * **Flexor digitorum profundus (FDP):** A classic hybrid muscle. The medial half (digits 4 and 5) is supplied by the **ulnar nerve**, while the lateral half (digits 2 and 3) is supplied by the **anterior interosseous nerve** (a branch of the median nerve). * **Brachialis:** It is a hybrid muscle. The majority is supplied by the **musculocutaneous nerve** (motor), but the lateral part is supplied by the **radial nerve** (proprioceptive/sensory). **High-Yield Clinical Pearls for NEET-PG:** * **Other common hybrid muscles:** * **Adductor magnus:** Obturator nerve and Sciatic nerve (Tibial part). * **Biceps femoris:** Long head (Tibial part of sciatic) and Short head (Common peroneal part of sciatic). * **Digastric:** Anterior belly (Nerve to mylohyoid - CN V3) and Posterior belly (Facial nerve - CN VII). * **Subscapularis:** Upper and lower subscapular nerves. * **Clinical Significance:** In nerve injuries (like a median nerve palsy), only the lateral half of the FDP is affected, leading to the "pointing sign" or "Ochsner’s clasping test" findings.

Question 748: Which nerve is most commonly injured during indirect inguinal hernia surgery?

A. Genitofemoral nerve
B. Obturator nerve
C. Femoral nerve
D. Ilioinguinal nerve (Correct Answer)

Explanation: ***Ilioinguinal nerve*** - This nerve travels superficial to the **external oblique aponeurosis** along the inguinal canal, making it extremely susceptible to direct trauma from surgical incisions, suture placement, or mesh fixation near the **pubic tubercle**. - Injury results in chronic pain and paresthesia (burning sensation) along its distribution, affecting the groin, lateral base of the penis/scrotum, and medial aspect of the thigh (**ilioinguinal neuralgia**). *Femoral nerve* - The femoral nerve lies deep to the **inguinal ligament** lateral to the femoral artery (part of the **NAVEL** bundle), a position deep and lateral to the primary operative field for indirect hernia repair. - Injury is rare in standard open inguinal hernia repair but can occur during deep retraction, or if the hernia dissection extends deeply and laterally below the inguinal ligament. *Genitofemoral nerve* - The genital branch traverses the inguinal canal within the **spermatic cord** and can be injured; however, the ilioinguinal nerve is more frequently involved due to its proximity to the surgical incision lines. - Injury to the genital branch specifically causes loss of the **cremaster reflex** and sensory loss over the anterior scrotum or labia. *Obturator nerve* - This nerve is located deep within the pelvis, passing through the **obturator canal** to supply the adductor muscles and medial thigh skin. - It is anatomically remote from the standard superficial and anterior approach required during routine indirect inguinal hernia repair.

Question 749: Identify the type of suture?

A. Horizontal mattress
B. Vertical Mattress
C. Subcuticular suture
D. Simple Interrupted suture (Correct Answer)

Explanation: ***Simple Interrupted suture*** - The image displays multiple, separate sutures, each individually placed and tied, which is characteristic of the **simple interrupted** technique. - This is the most common suturing method, providing good **wound apposition** and allowing for selective removal of single sutures if a localized infection develops. *Vertical Mattress* - A **vertical mattress suture** involves a 'far-far, near-near' stitching pattern in a plane perpendicular to the wound, which is not depicted in the image. - This technique is specifically used for everting wound edges and closing wounds under tension, creating a different surface appearance. *Horizontal mattress* - A **horizontal mattress suture** runs parallel to the wound edge on the skin surface, creating a box-like stitch to distribute tension. - It is primarily used for wounds under high tension or for providing **hemostasis**, and its appearance is distinctly different from the simple loops shown. *Subcuticular suture* - A **subcuticular suture** is placed entirely within the dermis, leaving no visible suture material on the skin surface except for the entry and exit points. - This method is used for optimal cosmetic results, whereas the image clearly shows external knots for each individual stitch.

Question 750: A 20-year-old male presents to the outpatient department with a swelling on his wrist. He reports fluctuation in size, mild numbness in the hand, and occasional pain. What is the most likely diagnosis?

A. Dermoid cyst
B. Lipoma
C. Ganglion cyst (Correct Answer)
D. Hematoma

Explanation: ***Ganglion cyst*** - This is the most common benign soft-tissue tumor of the hand and wrist, often arising from a **joint capsule** or **tendon sheath**. The classic presentation includes a smooth, round swelling on the wrist that can fluctuate in size. - Symptoms like mild pain and numbness can occur due to **nerve compression**, which is consistent with the patient's presentation. On examination, they are typically firm and **transilluminate**. *Lipoma* - A lipoma is a benign tumor composed of **adipose tissue** (fat). It typically presents as a soft, mobile, and “doughy” subcutaneous mass, which differs from the usually firm consistency of a ganglion cyst. - Lipomas do not fluctuate in size and are less likely to be found on the dorsal aspect of the wrist compared to ganglion cysts. *Dermoid cyst* - A dermoid cyst is a **congenital** lesion (a type of teratoma) containing dermal structures like hair follicles and sebaceous glands. They are most commonly found in the midline, face, or neck. - Their presence on the wrist is extremely rare, and they do not typically fluctuate in size like a ganglion cyst. *Hematoma* - A hematoma is a localized collection of blood, usually resulting from **trauma**. The patient's history does not mention any injury. - An acute hematoma would be tender and associated with **ecchymosis** (bruising), and it would be expected to resolve over time rather than fluctuate.

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Wound Healing and Care

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Surgical Infections

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Fluid and Electrolyte Management

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Nutrition in Surgical Patients

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Hemostasis and Blood Transfusion

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Surgical Instruments and Equipment

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Sutures and Stapling Devices

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Minimal Access Surgery Principles

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Surgical Complications

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Anesthesia Principles for Surgeons

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Evidence-Based Surgery

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