Plastic and Reconstructive Surgery — MCQs

A 9 1/2-year-old girl presents with an approximately 1 1/4-cm nontender nodule in her neck, just to the left of the midline and below her cricoid cartilage. The nodule moves when she swallows. It has been enlarging over the last several months and was not noted by her pediatrician at her 9-year-old check-up. There is no family history of endocrine disorders. What is the most likely diagnosis?

Q146Easy

Lines of Blaschko represent:

Q147Medium

A skin flap is used in the management of all the following conditions except:

Q148Medium

What is true about a dermoid cyst?

Q149Easy

Skin grafting is absolutely contraindicated in which skin infection?

Q150Easy

A Marjolin's ulcer, developing in a chronic burn scar, predisposes to which type of malignancy?

Plastic and Reconstructive Surgery Indian Medical PG Practice Questions and MCQs

Question 141: A full thickness loss of the middle one third of the upper lip is best reconstructed by which method?

A. Naso labial flap
B. Cheek flap
C. Abbe flap (Correct Answer)
D. Estlander's flap

Explanation: ### Explanation The reconstruction of lip defects is primarily determined by the **size** and **location** of the defect. For a full-thickness loss involving the **middle one-third** of either the upper or lower lip, the **Abbe flap** (also known as a cross-lip flap) is the gold standard. **Why Abbe Flap is Correct:** The Abbe flap involves transferring a full-thickness wedge of tissue from the opposite lip (in this case, the lower lip) into the defect of the upper lip. It is pedicled on the **labial artery**. This method is ideal for central defects because it replaces "like with like," restoring the vermilion border, muscle continuity (orbicularis oris), and skin, thereby maintaining both aesthetics and oral competence. **Analysis of Incorrect Options:** * **Estlander’s Flap:** This is a variation of the cross-lip flap specifically designed for defects involving the **oral commissure** (corner of the mouth). Since the question specifies the *middle* one-third, Estlander's is inappropriate. * **Nasolabial Flap:** While useful for skin defects of the lip or nose, it is typically a transposition flap that does not provide the full-thickness muscle required for a functional middle-lip reconstruction. * **Cheek Flap (e.g., Karapandzic or Bernard-Fries):** These are generally reserved for larger defects (greater than one-half to two-thirds of the lip) where local tissue advancement is necessary. **High-Yield Clinical Pearls for NEET-PG:** 1. **Rule of Thirds:** Defects <1/3 can be closed primarily. Defects 1/3 to 2/3 require flaps (Abbe/Estlander). Defects >2/3 require regional flaps (Karapandzic). 2. **Two-Stage Procedure:** The Abbe flap requires a second stage (usually after 2–3 weeks) to divide the vascular pedicle once neovascularization occurs. 3. **Vascular Supply:** The success of both Abbe and Estlander flaps depends on the integrity of the **labial artery**, which runs between the oral mucosa and the orbicularis oris muscle.

Question 142: What is the most preferable graft for mandibular reconstruction?

A. Graft from anterior iliac crest.
B. Costochondral graft.
C. Fibula graft. (Correct Answer)
D. Any of the above.

Explanation: The **Fibula Free Flap** is currently considered the "gold standard" for mandibular reconstruction, particularly for large segmental defects. ### Why Fibula Graft is the Correct Answer: 1. **Bone Length and Quality:** The fibula provides a long (up to 25 cm), straight, and dense cortical bone, which is ideal for reconstructing long-span mandibular defects. 2. **Vascular Pedicle:** It has a reliable and long vascular pedicle (peroneal artery and veins), making it highly suitable for microvascular free transfer. 3. **Osteotomy Potential:** The bone is thick enough to allow multiple "wedge" osteotomies (the "shaping" of the bone) to mimic the natural contour and angle of the mandible without compromising its blood supply. 4. **Dental Rehabilitation:** Its height and density are sufficient to support osseointegrated dental implants. 5. **Two-Team Approach:** It allows for a simultaneous harvest while the head and neck surgery is ongoing, reducing operative time. ### Why Other Options are Incorrect: * **Anterior Iliac Crest:** While it provides excellent bone volume and contour (natural curvature), the available length is limited compared to the fibula. It is also associated with higher donor site morbidity (pain and gait disturbance). * **Costochondral Graft:** These are primarily used in pediatric cases (e.g., Hemifacial Microsomia) because the cartilage provides a growth center. However, they lack the structural strength and length required for adult segmental mandibular reconstruction. ### High-Yield Clinical Pearls for NEET-PG: * **Blood Supply:** The fibula flap is based on the **peroneal artery**. * **Pre-op Evaluation:** Always perform a **Handheld Doppler** or **CT Angiogram** of the legs to ensure a three-vessel supply to the foot (to avoid limb ischemia after harvest). * **Sensory Nerve:** The **sural nerve** can be harvested simultaneously if a nerve graft is required. * **Skin Paddle:** It can be harvested as a "composite flap" including a skin paddle based on septocutaneous perforators.

Question 143: Which of the following mandibular positions is least likely achievable with a bilateral sagittal split osteotomy?

A. Advancement
B. Set back
C. Rotation
D. Transverse (Correct Answer)

Explanation: **Explanation:** The **Bilateral Sagittal Split Osteotomy (BSSO)** is the most versatile and commonly performed surgical procedure for correcting mandibular deformities. The technique involves a sagittal split of the mandibular ramus, dividing it into two segments: a **proximal segment** (containing the condyle) and a **distal segment** (containing the teeth and chin). **Why Transverse is the correct answer:** The BSSO is primarily designed to move the distal segment of the mandible along the sagittal and vertical planes. While it can achieve **Advancement** (for retrognathia), **Set back** (for prognathism), and **Rotation** (to correct asymmetries or open bites), it is **least effective for Transverse (width) changes**. Significant widening or narrowing of the mandible requires a **Midline Mandibular Osteotomy (Symphyseal split)** or distraction osteogenesis, as BSSO is limited by the anatomy of the ramus and the risk of condylar displacement/TMJ dysfunction if forced transversely. **Analysis of Incorrect Options:** * **Advancement (A):** The most common indication for BSSO; the distal segment is slid forward to treat mandibular hypoplasia. * **Set back (B):** Used to treat mandibular hyperplasia (prognathism) by sliding the distal segment posteriorly. * **Rotation (C):** BSSO allows for the correction of occlusal cants or midline shifts by rotating the distal segment before fixation. **High-Yield Clinical Pearls for NEET-PG:** * **Nerve at risk:** The **Inferior Alveolar Nerve (IAN)** is the most commonly injured structure during BSSO, leading to lower lip paresthesia. * **Stability:** BSSO is more stable for advancement than for set-back procedures. * **Fixation:** Usually performed using rigid internal fixation (screws/plates), which often eliminates the need for prolonged maxillomandibular fixation (MMF).

Question 144: How does a skin graft vestibuloplasty prevent relapse?

A. By forming a barrier to reattachment of muscle to periosteum (Correct Answer)
B. By promoting osteogenesis to establish a bone barrier to loss of sulcus depth
C. By causing an inhibitory effect on fibroblasts in the underlying tissue
D. None of the above

Explanation: **Explanation:** **Vestibuloplasty** is a pre-prosthetic surgical procedure designed to increase the depth of the alveolar sulcus, providing a larger surface area for denture retention. The primary challenge following this procedure is the high rate of relapse, where the raw periosteal surface tends to heal by secondary intention, causing the overlying muscles to reattach at their original, more superficial level. **Why Option A is Correct:** The application of a **split-thickness skin graft (STSG)** acts as a biological physical barrier. By covering the exposed periosteum and the raw underside of the labial/buccal flap, the graft prevents the migrating muscle fibers and connective tissue from re-adhering to the periosteum. This "seals" the new depth of the vestibule and inhibits the contractile forces of secondary healing, thereby maintaining the surgically created sulcus depth. **Why Other Options are Incorrect:** * **Option B:** Vestibuloplasty is a soft-tissue procedure. While it improves the functional ridge height, it does not involve or promote **osteogenesis** (bone formation). * **Option C:** While skin grafts do reduce wound contraction compared to secondary epithelization, they do not exert a biochemical **inhibitory effect on fibroblasts**; rather, they provide a mature epithelial surface that signals the end of the proliferative phase of healing. **Clinical Pearls for NEET-PG:** * **Gold Standard:** The skin graft vestibuloplasty (often associated with the **Clark’s or Esser’s technique**) is highly effective because skin lacks the high metabolic turnover and contraction rate of oral mucosa. * **Contraction:** Full-thickness grafts contract less than split-thickness grafts, but split-thickness grafts "take" more easily on the periosteum due to lower metabolic demands. * **Alternative:** Mucosal grafts (e.g., from the palate) are also used to avoid the "hairy" or "non-keratinized" complications of skin in the oral cavity.

Question 145: A 9 1/2-year-old girl presents with an approximately 1 1/4-cm nontender nodule in her neck, just to the left of the midline and below her cricoid cartilage. The nodule moves when she swallows. It has been enlarging over the last several months and was not noted by her pediatrician at her 9-year-old check-up. There is no family history of endocrine disorders. What is the most likely diagnosis?

A. Reactive viral lymphadenopathy
B. Papillary thyroid cancer (Correct Answer)
C. A brachial cleft cyst
D. A follicular adenoma of the thyroid

Explanation: ### Explanation **Correct Answer: B. Papillary thyroid cancer** The clinical presentation of a **midline or near-midline neck nodule** that **moves with deglutition** (swallowing) strongly indicates a thyroid origin. In children, any solitary thyroid nodule must be treated with a high index of suspicion. While thyroid nodules are less common in children than in adults, the risk of malignancy in a pediatric solitary nodule is significantly higher (approximately **22–26%** compared to 5% in adults). **Papillary Thyroid Cancer (PTC)** is the most common pediatric thyroid malignancy. The rapid enlargement over a few months and the location below the cricoid cartilage point toward a thyroid primary rather than a benign developmental cyst. **Why other options are incorrect:** * **A. Reactive viral lymphadenopathy:** Usually presents as multiple, tender, lateral neck nodes following an upper respiratory infection. They do not typically move with swallowing. * **C. Branchial cleft cyst:** These are typically located **laterally**, along the anterior border of the sternocleidomastoid muscle, and do not move with deglutition. * **D. Follicular adenoma:** While a possibility, the rapid growth and the high statistical prevalence of PTC in pediatric thyroid nodules make PTC the "most likely" diagnosis in an exam setting. --- ### NEET-PG High-Yield Pearls * **Movement with Swallowing:** Occurs because the thyroid gland is enveloped by the **pretracheal fascia**, which attaches to the hyoid bone and thyroid cartilage. * **Thyroglossal Duct Cyst (TGDC):** The most common midline swelling in children. Unlike thyroid nodules, a TGDC moves with **protrusion of the tongue**. * **Pediatric Thyroid Nodules:** Rule of thumb—a solitary cold nodule in a child is **malignant until proven otherwise**. * **Investigation of Choice:** Ultrasound followed by **Fine Needle Aspiration Cytology (FNAC)**. * **Psammoma bodies:** Characteristic histological finding in Papillary Thyroid Cancer (laminated calcifications).

Question 146: Lines of Blaschko represent:

A. Lines along lymphatics
B. Lines along blood vessels
C. Lines of nerves
D. Lines of development (Correct Answer)

Explanation: **Explanation:** **Lines of Blaschko** are non-random cutaneous patterns that do not correspond to any known vascular, lymphatic, or nervous pathways. Instead, they represent the **lines of migration and proliferation of epidermal cells** (keratinocytes and melanocytes) during embryonic development. 1. **Why Option D is Correct:** During embryogenesis, precursor cells migrate from the neural crest and proliferate to cover the body surface. These lines reflect the clonal expansion of these cells. They typically follow a "V-shape" on the back, an "S-shape" on the chest and abdomen, and a linear pattern on the limbs. They become visible only in certain genetic or acquired skin diseases (e.g., Incontinentia Pigmenti, Linear Epidermal Nevus) where a mutation occurs in a subset of cells (mosaicism). 2. **Why Other Options are Incorrect:** * **A & B (Lymphatics/Blood vessels):** Vascular and lymphatic distributions follow distinct anatomical branching patterns (e.g., angiosomes) which do not match the characteristic whorled or V-shaped patterns of Blaschko lines. * **C (Nerves):** Lines following nerve distributions are called **Dermatomes**. While dermatomes are also developmental, they represent the sensory distribution of spinal nerves and differ significantly in morphology from Blaschko lines. **High-Yield Clinical Pearls for NEET-PG:** * **Langer’s Lines:** Lines of skin tension/cleavage (collagen orientation); crucial for surgical incisions to minimize scarring. * **Kraissl’s Lines:** Lines of maximum skin tension in a living, moving body (often used interchangeably with Langer's in clinical practice). * **Mosaicism:** The most common reason Blaschko lines become clinically apparent. * **Key Disease Example:** *Incontinentia Pigmenti* classically follows the Lines of Blaschko.

Question 147: A skin flap is used in the management of all the following conditions except:

A. Bone
B. Tendon
C. Burn wound (Correct Answer)
D. Cartilage

Explanation: The core concept in reconstructive surgery is the distinction between a **skin graft** and a **skin flap**. The choice depends on the vascularity of the recipient bed. ### Why "Burn Wound" is the Correct Answer In most cases of acute burns (specifically partial-thickness or full-thickness burns), the underlying wound bed is **vascular** (granulation tissue or dermis). Such beds can support a **skin graft**, which lacks its own blood supply and relies on the recipient site for nourishment (via plasmatic imbibition and inosculation). Using a flap for a standard burn wound is unnecessary, overly complex, and surgically inappropriate unless deep structures are exposed. ### Why the Other Options are Incorrect Flaps are mandatory when the recipient bed is **avascular** or "non-takeable" for a graft. A flap carries its own blood supply (pedicle), allowing it to survive over: * **Bone (A):** Cortical bone without periosteum cannot nourish a graft. * **Tendon (B):** Bare tendons (without paratenon) lack the vascularity required for graft survival. * **Cartilage (D):** Cartilage without perichondrium is avascular and requires flap coverage. ### High-Yield Clinical Pearls for NEET-PG * **The Reconstructive Ladder:** Always start with the simplest option. (Primary closure → Secondary intention → Skin Graft → Local Flap → Distant Flap → Free Flap). * **Graft vs. Flap:** If the bed is vascular (muscle, fat, periosteum), use a **Graft**. If the bed is avascular (bare bone, tendon, nerve), use a **Flap**. * **Exception:** If a burn is so deep that it exposes bone or tendon (4th-degree burn), a flap *would* be required, but for standard burn management, grafts are the gold standard.

Question 148: What is true about a dermoid cyst?

A. Lined by columnar epithelium
B. Does not contain hair
C. The median angle of the eye is the most common site
D. Rupture is associated with foreign body type inflammation (Correct Answer)

Explanation: A **dermoid cyst** is a sequestration-type cyst formed when ectoderm is trapped along the lines of embryonic fusion. ### **Explanation of Options** * **Correct Answer (D):** Dermoid cysts contain adnexal structures like sebaceous glands, which produce **sebum and keratin**. If the cyst wall ruptures, these contents leak into the surrounding tissues, triggering a robust **foreign body giant cell reaction** and granulomatous inflammation. * **A is Incorrect:** Dermoid cysts are lined by **stratified squamous epithelium** (skin), not columnar epithelium. * **B is Incorrect:** Because they are lined by true skin, they frequently contain skin appendages such as **hair follicles**, sweat glands, and sebaceous glands. * **C is Incorrect:** The most common site for an external angular dermoid is the **lateral (outer) angle of the eye**, not the median (inner) angle. ### **High-Yield Clinical Pearls for NEET-PG** 1. **Pathology:** It is a "sequestration dermoid." Unlike sebaceous cysts, dermoid cysts are **congenital** and are **not** attached to the overlying skin (no punctum). 2. **Common Sites:** * **External Angular Dermoid:** Most common site (lateral eyebrow). * **Sublingual Dermoid:** Located in the midline of the floor of the mouth (above or below the mylohyoid). 3. **Radiology:** In the skull, they often cause a "punched-out" lucency due to pressure erosion of the bone. 4. **Differentiating Feature:** Always perform a clinical check for **fixity to underlying bone** and cough impulse (to rule out intracranial extension/meningocele).

Question 149: Skin grafting is absolutely contraindicated in which skin infection?

A. Staphylococcus
B. Pseudomonas
C. Streptococcus (Correct Answer)
D. Proteus

Explanation: **Explanation:** The success of a skin graft depends on the preparation of the recipient bed. While most bacterial infections reduce the "take" of a graft, infection with **Group A Beta-Hemolytic Streptococcus (Streptococcus pyogenes)** is considered an absolute contraindication to skin grafting. **Why Streptococcus is the Correct Answer:** Streptococci produce the enzyme **fibrinolysin (streptokinase)**. Skin grafts initially adhere to the recipient bed via a fibrin network (the "fibrin glue" phase). Fibrinolysin produced by the bacteria dissolves this fibrin bond, preventing the graft from adhering and leading to total graft loss. Furthermore, Streptococci are highly invasive and can cause rapid cellulitis or necrotizing fasciitis in the recipient site. **Analysis of Incorrect Options:** * **Staphylococcus (A):** While *S. aureus* is a common wound pathogen that produces coagulase and can cause localized pus formation, it does not typically cause the total dissolution of the fibrin layer. Grafting can often succeed if the bacterial load is low (<10⁵ organisms/gram of tissue). * **Pseudomonas (B):** Known for its characteristic blue-green discharge and fruity odor, *Pseudomonas* is a common colonizer of burn wounds. While it can cause graft loss through the production of proteases, it is a **relative contraindication**. Grafting can often proceed after topical treatment (e.g., acetic acid or silver sulfadiazine). * **Proteus (D):** Similar to other Gram-negative bacteria, *Proteus* can impair healing, but it does not possess the specific fibrinolytic mechanism that makes *Streptococcus* an absolute contraindication. **High-Yield Clinical Pearls for NEET-PG:** * **Quantitative Threshold:** For a skin graft to "take," the bacterial count in the recipient bed should ideally be less than **10⁵ organisms per gram of tissue**. * **The "Golden Period":** The first 48 hours of graft survival depend on **plasmatic imbibition**, followed by **inosculation** (alignment of capillaries). * **Most common cause of graft failure:** **Hematoma** (prevents contact between graft and bed). * **Most common infectious cause of graft failure:** **Beta-hemolytic Streptococcus.**

Question 150: A Marjolin's ulcer, developing in a chronic burn scar, predisposes to which type of malignancy?

A. Basal cell carcinoma
B. Squamous cell carcinoma (Correct Answer)
C. Adenocarcinoma
D. Round cell carcinoma

Explanation: **Explanation:** **Marjolin’s ulcer** refers to a malignancy arising in a site of chronic inflammation, trauma, or scarring. The most common precursor is a **chronic burn scar** (post-burn cicatrix), though it can also occur in chronic osteomyelitis sinuses, pressure sores, or venous ulcers. 1. **Why Squamous Cell Carcinoma (SCC) is correct:** The constant irritation, chronic infection, and poor lymphatic drainage in a scarred area lead to repeated cycles of cell damage and repair. Over time (typically a latent period of 10–25 years), this triggers malignant transformation of the keratinocytes. **Squamous cell carcinoma** is the histological type in approximately 75–90% of Marjolin’s ulcers. These are generally more aggressive and have a higher rate of metastasis than SCC arising in healthy skin. 2. **Why other options are incorrect:** * **Basal Cell Carcinoma (BCC):** While BCC is the most common skin cancer overall, it typically arises on sun-exposed skin. It occurs in Marjolin’s ulcers much less frequently than SCC. * **Adenocarcinoma:** This arises from glandular epithelium (e.g., GI tract, breast). It is not associated with cutaneous burn scars. * **Round Cell Carcinoma:** This is a category of highly undifferentiated tumors (like Ewing’s sarcoma or lymphomas) and is not related to chronic scar transformation. **High-Yield Clinical Pearls for NEET-PG:** * **Latency:** The average time for transformation is **30 years**. * **Characteristics:** Marjolin’s ulcers are typically painless (due to destroyed nerve endings in the scar), have everted edges, and a foul-smelling discharge. * **Lymph Nodes:** Despite being aggressive, lymph node metastasis may be delayed because the dense scar tissue acts as a barrier to lymphatic spread. * **Management:** Wide local excision (2 cm margin) is the treatment of choice; Mohs surgery or amputation may be required depending on depth and location.

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Wound Healing

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Skin Grafts

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Flap Surgery Principles

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Local Flaps

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Regional Flaps

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Microsurgical Techniques

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Tissue Expansion

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Breast Reconstruction

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Hand Surgery Basics

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Craniofacial Surgery Principles

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Aesthetic Surgery Concepts

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Body Contouring

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