General Surgery Principles — MCQs

General Surgery Principles Indian Medical PG Practice Questions and MCQs

Question 941: What is Cock's peculiar tumor?

A. Ulceration of a sebaceous cyst (Correct Answer)
B. Calcifying epithelioma (Pilomatrixoma)
C. Mesothelioma of the pleura
D. Osteomyelitis of the skull

Explanation: ***Ulceration of a sebaceous cyst*** - **Cock's peculiar tumor** is an older term used to describe a **neglected**, **infected**, and **ulcerating sebaceous cyst** that has eroded through the skin. - Over time, these cysts can become secondarily infected and inflamed, leading to rupture and the formation of a chronic ulcer. *Calcifying epithelioma (Pilomatrixoma)* - This is a **benign tumor** of the hair matrix, presenting as a firm, solitary nodule, most common in the head and neck. - It is characterized by **calcification** and is not typically associated with ulceration as a primary feature, nor does it originate from a sebaceous cyst. *Mesothelioma of the pleura* - This is a **malignant tumor** arising from the mesothelial cells lining the pleura, often associated with **asbestos exposure**. - It is an internal malignancy affecting the lungs and pleura, completely unrelated to skin lesions or sebaceous cysts. *Osteomyelitis of the skull* - This is an **infection of the bone** in the skull, usually caused by bacteria, leading to bone destruction and inflammation. - While it can present with swelling and pain, it is a primary bone infection and not related to sebaceous cysts or skin lesions.

Question 942: Closure for clean wounds within 6 hours of injury is called.

A. Primary closure (Correct Answer)
B. Delayed primary closure
C. Secondary closure
D. Tertiary closure

Explanation: ***Primary closure*** - **Primary closure** is the immediate closure of a wound, typically within **6 hours** of injury, for **clean wounds** at low risk of infection. - This method promotes direct apposition of wound edges, leading to **faster healing** and **minimal scarring**. *Delayed primary closure* - This involves leaving a wound open for **4-6 days** to monitor for infection or edema, then closing it if conditions are favorable. - It is often used for **contaminated wounds** or those with a higher risk of infection, where immediate closure is not safe. - Also known as **tertiary closure**. *Secondary closure* - **Secondary closure**, or healing by secondary intention, occurs when a wound is left open and allowed to **heal naturally by granulation, contraction, and epithelialization**. - This method is used for **heavily contaminated** or **infected wounds** and results in a larger scar and a longer healing time. *Tertiary closure* - **Tertiary closure** is another term for **delayed primary closure**. - It involves leaving a wound open initially, then closing it after several days (typically 4-6 days) once the risk of infection has decreased. - This option is incorrect because the question asks about closure **within 6 hours**, not delayed closure.

Question 943: Wound strength is 70% after how many weeks?

A. 1 week
B. 4 weeks
C. 24 weeks
D. 12 weeks (Correct Answer)

Explanation: ***3 months*** - Wound strength typically reaches **70%** of its maximum after approximately **3 months** post-surgery or injury [1]. - After this period, collagen formation and remodeling lead to significant strength improvement in the healing tissue [1]. *6 months* - By **6 months**, wound strength may exceed **70%**, but **70%** is achieved around **3 months**. - This option suggests a longer timeframe than necessary for initial strength recovery. *1 week* - At **1 week**, wound strength is quite low, usually around **10%** [1], with ongoing processes of healing and inflammation. - Insufficient time has elapsed for substantial collagen synthesis or remodeling, making this option inaccurate. *1 month* - While some improvement occurs by **1 month**, wound strength is still below **70%** at this stage, often around **30-50%** [1]. - Wound healing progresses significantly in the subsequent weeks, emphasizing the need for a longer recovery period to achieve 70% strength [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 119-121.

Question 944: Rapid polymerization with high intensity light will:

A. No effect on bond strength
B. Initial increase followed by a decrease in bond strength
C. Decrease bond strength by increasing stresses (Correct Answer)
D. Increase bond strength by decreasing stresses

Explanation: ***Decrease bond strength by increasing stresses*** - Rapid polymerization with **high-intensity light** leads to a **faster gel point conversion** and a rapid increase in viscosity. - This rapid setting traps internal stresses within the **polymerized material** due to **volumetric shrinkage**, preventing proper stress relief and leading to higher internal stresses, which ultimately **reduces bond strength**. *Increase bond strength by decreasing stresses* - This statement is incorrect because rapid polymerization during high-intensity light curing causes a rapid increase in **polymerization shrinkage stress**. - **Increased stresses** within the material will tend to **reduce bond strength**, not increase it, as the material is less able to relax these stresses. *No effect on bond strength* - This is incorrect as the **rate of polymerization** directly influences the development of **stress** within the composite material. - **High-intensity light curing** affects the **kinetics of polymerization**, leading to significant changes in **mechanical properties** like bond strength. *Initial increase followed by a decrease in bond strength* - While there is an initial increase in **mechanical properties** as the material polymerizes, the **high stress levels** generated by rapid polymerization with high intensity light cause a net decrease in the **ultimate bond strength**. - The rapid formation of a **cross-linked network** under high intensity light creates a stiff material that cannot effectively relieve internal stresses, leading to **weakened bonds**.

Question 945: Tracheostomy is typically performed between which tracheal rings?

A. 7th-8th tracheal rings
B. 2nd-3rd tracheal rings (Correct Answer)
C. 5th-6th tracheal rings
D. 1st tracheal ring

Explanation: ***2nd-3rd tracheal rings*** - The space between the **2nd and 3rd tracheal rings** is the **most common and preferred site** for performing a tracheostomy. - This location provides optimal balance between ease of access and safety, minimizing risk of damage to the **cricoid cartilage** superiorly while avoiding larger vascular structures inferiorly. - This standard placement reduces complications including subglottic stenosis and major vessel injury. - Most surgical textbooks and guidelines recommend this as the **ideal anatomical site** for elective tracheostomy. *1st tracheal ring* - Performing a tracheostomy at the level of the **first tracheal ring** is generally avoided as it is too high and carries significant risk of damaging the **cricoid cartilage** and affecting the **larynx**. - This high placement can lead to **subglottic stenosis** and voice complications. *5th-6th tracheal rings* - A tracheostomy performed between the **5th and 6th tracheal rings** is considered too low and increases the risk of complications. - This deep approach may encounter surrounding vascular structures and is generally not recommended for standard tracheostomy procedures. *7th-8th tracheal rings* - Performing a tracheostomy between the **7th and 8th tracheal rings** is too low and increases the risk of entering the **mediastinum** or damaging the **innominate artery** or other major vessels. - This deeper dissection can lead to significant bleeding and other serious complications.

Question 946: Which hernia repair technique emphasizes tension-free repair with mesh reinforcement?

A. Bassini's repair
B. Darning repair
C. Stoppa's preperitoneal repair
D. Lichtenstein mesh repair (Correct Answer)

Explanation: ***Lichtenstein mesh repair*** - This technique is considered the gold standard for **inguinal hernia repair** due to its emphasis on a **tension-free approach** using a synthetic mesh. - The mesh reinforces the posterior wall of the inguinal canal without putting tension on the surrounding tissues, significantly reducing recurrence rates. *Stoppa's preperitoneal repair* - This is a **preperitoneal repair** technique that uses a large piece of mesh placed in the preperitoneal space to cover bilateral hernias or recurrent hernias, but it's not the primary technique for emphasizing tension-free repair *with mesh* for standard inguinal hernias in the same way Lichtenstein is. - It involves a larger dissection and is typically reserved for more complex cases. *Bassini's repair* - This is a **tension repair** technique where the conjoined tendon is sutured to the inguinal ligament. - It does not involve mesh and is associated with higher recurrence rates and postsurgical pain due to the tension on the tissues. *Darning repair* - This is another **tension repair** technique that involves suturing various muscular and aponeurotic layers together to reinforce the hernia defect. - Like Bassini's repair, it does not use mesh and relies on suturing native tissues under tension, leading to increased recurrence rates and patient discomfort.

Question 947: Which type of amputation is depicted in the provided image?

A. Krukenberg's (Correct Answer)
B. Chopart's
C. Syme's amputation
D. Lisfranc amputation

Explanation: ***Krukenberg's*** - The image clearly depicts an upper limb with the **radius and ulna separated**, creating a pincer-like grasp, which is the hallmark of a Krukenberg's amputation. - This type of amputation is a unique surgical procedure that converts a forearm stump into a **functional forceps-like grip**, allowing for prehension and tactile sensation. *Chopart's* - This is a **partial foot amputation** that involves disarticulation through the midtarsal joint (talonavicular and calcaneocuboid joints). - It would not result in the distinct forearm morphology seen in the image. *Syme's amputation* - A Syme's amputation is an **ankle disarticulation** where the foot is removed at the ankle joint, but the heel pad is preserved and used to cover the distal tibia. - This procedure is performed on the lower limb, not the upper limb as shown. *Lisfranc amputation* - A Lisfranc amputation is a **disarticulation of the foot** through the tarsometatarsal joints, removing the toes and metatarsals while preserving the tarsal bones. - Like Chopart's and Syme's, this is a lower limb amputation and does not match the image.

Question 948: Most important early postoperative complication of ileostomy:

A. Necrosis (Correct Answer)
B. Prolapse
C. Obstruction
D. Diarrhea

Explanation: ***Necrosis*** - Stomal **necrosis** can occur early postoperatively due to issues with **blood supply** to the ileum, often caused by excessive tension on the mesentery or improper creation of the stoma. - This complication can lead to severe issues like perforation and sepsis if not promptly identified and managed. *Obstruction* - While **obstruction** can occur after ileostomy, it is typically a **delayed complication** often caused by adhesions, internal herniation, or food bolus impaction. - Early postoperative obstruction is less common unless there's an immediate surgical issue like a twisted loop or stricture. *Prolapse* - **Stoma prolapse**, where the bowel telescopes out through the stoma, is usually a **late complication** that develops over time due to weakened abdominal wall muscles or increased intra-abdominal pressure. - It is rarely seen in the immediate postoperative period without predisposing factors. *Diarrhea* - **High-output stoma** (sometimes referred to as diarrhea in general terms) is a common early postoperative issue, but it is considered a **physiological response** rather than a complication. - This is due to the lack of colonic absorption, leading to unformed stools and potential electrolyte imbalances, but it's not a direct surgical complication in the same way necrosis is.

Question 949: The most common wavelength of a diode laser used in medical applications is:

A. 630 nm
B. 810 nm (Correct Answer)
C. 670 nm
D. 520 nm

Explanation: ***810 nm*** - **810 nm** is the **most common wavelength** for medical diode lasers used in clinical practice. - This wavelength provides **optimal melanin absorption** while maintaining good tissue penetration, making it ideal for **hair removal**, **vascular lesions**, and **soft tissue surgery**. - The 810 nm diode laser offers an excellent balance between **efficacy** and **safety**, with predictable tissue interaction and minimal collateral thermal damage. - It is widely used in **dermatology**, **ophthalmology**, and **general surgery** for various ablative and coagulative procedures. *670 nm* - 670 nm lasers are used primarily in **low-level laser therapy (LLLT)** or photobiomodulation for wound healing and pain management. - While therapeutically useful, this wavelength represents a **specialized application** rather than the most common general medical diode laser wavelength. - Its superficial penetration limits its use in deeper tissue procedures. *630 nm* - 630 nm lasers are specifically used for **photodynamic therapy (PDT)** where they activate photosensitizers for treating certain cancers and skin conditions. - This is a **highly specialized application** with disease-specific utility, not the most prevalent wavelength for general diode laser applications. - Its clinical use is restricted to light-activated drug therapies rather than direct tissue interaction. *520 nm* - 520 nm (green light) lasers are strongly absorbed by **hemoglobin**, making them useful for **vascular lesions** such as port-wine stains and telangiectasias. - However, this wavelength is **less commonly used** overall compared to near-infrared wavelengths like 810 nm. - Its limited penetration depth and specific target chromophore restrict its broader application in medical practice.

Question 950: What is a key advantage of titanium in medical implants compared to other base metal alloys?

A. Lightweight nature (Correct Answer)
B. Cost-effectiveness
C. High strength
D. High melting point

Explanation: ***Lightweight nature*** - Titanium has an exceptional **high strength-to-weight ratio**, which is a key distinguishing advantage for medical implants where reduced mass improves patient comfort and mobility. - Its **low density** (approximately 60% that of stainless steel) results in less stress on surrounding tissues and bone, while maintaining necessary mechanical strength. - This makes titanium particularly valuable for load-bearing implants in orthopedic and dental applications where both strength and reduced weight are critical. *Cost-effectiveness* - Titanium alloys are **significantly more expensive** than stainless steel or other base metal alloys due to complex extraction and manufacturing processes. - The higher initial cost is offset by superior biocompatibility and longevity, but cost-effectiveness is not an advantage of titanium. *High strength* - While titanium does possess good strength, other base metal alloys like **stainless steel (316L) and cobalt-chromium alloys** have comparable or even superior absolute tensile strength. - The advantage of titanium is not raw strength alone, but rather its **strength combined with low weight** (strength-to-weight ratio). *High melting point* - Titanium's melting point (~1668°C) is high, but this property is primarily relevant for manufacturing processes, not for clinical implant performance. - For medical implants, properties like **biocompatibility, corrosion resistance, and osseointegration** are more clinically relevant than melting point.

Practice by Chapter

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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Surgical Oncology Principles

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Evidence-Based Surgery

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