Plastic and Reconstructive Surgery Practice Questions

Q: A 3.3 kg, 36-week baby girl was born prematurely after labor caused by ruptured membranes. Prenatal ultrasound revealed polyhydramnios at 26 weeks. Fetal echocardiogram was normal and amniocentesis was without genetic aberrance. On examination, there was a normal anus, and a nasogastric tube drained bile-stained fluid. The baby passed some mucus but no typical dark meconium. A chest and abdominal X-ray showed a "double bubble sign". What is the most likely diagnosis?

Duodenal atresia. ### Explanation **Correct Answer: C. Duodenal Atresia** The clinical presentation is classic for **Duodenal Atresia**. The key diagnostic feature is the **"double bubble sign"** on X-ray, which represents air in the dilated stomach and the proximal duodenum, with no distal gas. * **Pathophysiology:** It results from a failure of recanalization of the duodenum during the 8th–10th week of gestation. * **Clinical Correlation:** Polyhydramnios is common (due to inability to swallow/absorb amniotic fluid). Postnatally, it presents with **bilious vomiting** (as the obstruction is usually distal to the ampulla of Vater) and a scaphoid abdomen. While 30% of cases are associated with Down Syndrome (Trisomy 21), this patient had a normal amniocentesis, which is possible. **Why other options are incorrect:** * **A. Acute Pancreatitis:** Extremely rare in neonates; it does not present with a double bubble sign or a history of polyhydramnios. * **B. Neonatal Hirschsprung's Disease:** This is a distal bowel obstruction. It presents with delayed passage of meconium (>48 hours) and **distended bowel loops** on X-ray, not a double bubble sign. * **D. Malrotation of Midgut:** While Volvulus can cause a double bubble sign, it is usually an acute surgical emergency presenting later with sudden onset bilious vomiting in a previously healthy infant. The history of polyhydramnios strongly favors atresia over malrotation. **High-Yield NEET-PG Pearls:** * **Double Bubble Sign:** Seen in Duodenal Atresia, Annular Pancreas, and Midgut Volvulus. * **Triple Bubble Sign:** Associated with **Jejunal Atresia**. * **Ground Glass Appearance/Neuhauser Sign:** Associated with **Meconium Ileus**. * **Association:** Duodenal atresia is the most common obstructive lesion of the small intestine in neonates and is associated with **VACTERL** anomalies and Down Syndrome.

Q: Which of the following statements regarding an axial flap is true?

It carries its own vessels within it.. ### Explanation **Concept Overview:** Skin flaps are classified based on their blood supply into two main categories: **Random Pattern Flaps** and **Axial Pattern Flaps**. **Why Option A is Correct:** An **Axial Flap** is defined by the presence of a **named anatomical artery and vein** (pedicle) running along its long axis within the subcutaneous tissue. Because it carries its own dedicated vessels, these flaps have a much more reliable blood supply compared to random flaps. This allows for a significantly larger length-to-width ratio (often exceeding 3:1 or 4:1), as the flap is not dependent on the limited subdermal plexus alone. **Analysis of Incorrect Options:** * **Option B (Kept in a limb):** While axial flaps can be used in limb reconstruction (e.g., Radial Artery Forearm Flap), they are not restricted to limbs. They are used throughout the body (e.g., Groin flap, Deltopectoral flap). * **Option C (Transverse flap):** Axial flaps are defined by their vascular anatomy, not their orientation. While some may be transverse, the defining feature is the longitudinal axis of the vessel. * **Option D (Carries its own nerve):** While some flaps can be "sensate" (neurosensory flaps) if a nerve is included, this is not the defining characteristic of an axial flap. The fundamental requirement is the vascular pedicle. **High-Yield NEET-PG Pearls:** * **Classic Example:** The **Groin Flap** (based on the Superficial Circumflex Iliac Artery) was the first described axial pattern flap. * **Length-Width Ratio:** Random flaps are generally limited to a **1:1 or 2:1** ratio to prevent distal necrosis; axial flaps bypass this restriction. * **Island Flap:** If an axial flap is detached from the skin and remains attached only by its vessel stalk, it is called an "Island Flap." * **Free Flap:** If the axial vessels are cut and re-anastomosed at a distant site using microvascular surgery, it becomes a "Free Flap."

Q: According to Veau's classification, which class does the diagrammatic representation of cleft palate belong to?

Class 1. ***Class 1*** - Involves only the **soft palate** and **uvula**, sparing the hard palate completely. - This is the mildest form of cleft palate according to **Veau's classification**, affecting only the posterior portion of the palate. *Class 2* - Extends through both the **soft palate** and **hard palate** but does not reach the **alveolar ridge**. - More extensive than Class 1 as it involves the **entire palate** except the anterior alveolar process. *Class 3* - Involves a **unilateral complete cleft** extending through the soft palate, hard palate, and **alveolar ridge** on one side. - Often associated with **unilateral cleft lip** and creates communication between oral and nasal cavities. *Class 4* - Represents a **bilateral complete cleft** involving soft palate, hard palate, and **both alveolar ridges**. - The most severe form, often associated with **bilateral cleft lip** and significant feeding and speech difficulties.

Q: Acanthosis nigricans is typically associated with which of the following conditions?

All of the above. **Explanation:** Acanthosis Nigricans (AN) is a dermatological manifestation characterized by hyperpigmented, velvety plaques typically found in intertriginous areas (axilla, neck, and groin). While most commonly associated with insulin resistance and obesity (Benign AN), its sudden onset in an older, non-obese individual often signals **Malignant Acanthosis Nigricans**. **Why "All of the above" is correct:** Malignant AN is a **paraneoplastic syndrome** caused by the secretion of Transforming Growth Factor-alpha (TGF-α) or Epidermal Growth Factor (EGF) by tumor cells. These factors stimulate keratinocyte and fibroblast proliferation. * **Gastrointestinal Malignancy:** This is the most common association (approx. 90% of cases), with **Gastric Adenocarcinoma** being the single most frequent primary site. * **Lung and Breast Cancer:** While less common than GI triggers, both are well-documented causes of paraneoplastic AN. Other associated sites include the liver, prostate, and ovaries. **Clinical Pearls for NEET-PG:** * **Tripe Palms:** When AN involves the palms (appearing rugose and thickened), it is highly suggestive of internal malignancy. If seen with AN, think **Gastric Cancer**; if seen alone, think **Lung Cancer**. * **Leser-Trélat Sign:** The sudden eruption of multiple seborrheic keratoses is often seen alongside malignant AN, both indicating an underlying visceral malignancy. * **Distinction:** Unlike benign AN, the malignant form is characterized by rapid onset, extensive involvement, and involvement of atypical sites like the mucous membranes or palms. **Summary:** Because AN serves as a non-specific cutaneous marker for various internal adenocarcinomas, all the listed options are potential underlying causes.

Q: What is the recommended incision for a felon?

Longitudinal. **Explanation:** A **felon** is a closed-space infection of the terminal pulp space of the finger. Because this space is divided into multiple small compartments by tough fibrous septa (connecting the skin to the periosteum), pressure builds up rapidly, leading to intense pain and potential necrosis of the distal phalanx. **Why Longitudinal is Correct:** The current standard of care for a felon is a **unilateral longitudinal incision** made over the area of maximum tenderness. This approach is preferred because: 1. It provides direct drainage of the infected compartments. 2. It avoids crossing the flexion creases. 3. It minimizes damage to the digital nerves and vessels. 4. It prevents the formation of unstable scars on the tactile surface of the fingertip. **Analysis of Incorrect Options:** * **Transverse:** This is contraindicated as it does not adequately drain the longitudinal fibrous septa and risks damaging the digital neurovascular bundles. * **Bilateral longitudinal:** This was historically used but is now discouraged as it can lead to an anesthetic "floating" fingertip and significant scarring. * **Fish mouth:** This involves a circumferential incision around the tip. It is strongly condemned because it destroys the blood supply to the pulp, leads to a painful, unstable scar, and often results in permanent sensory loss. **High-Yield Clinical Pearls for NEET-PG:** * **Most common organism:** *Staphylococcus aureus*. * **Complication:** If left untreated, a felon can lead to **osteomyelitis** of the distal phalanx (due to pressure necrosis of the nutrient artery). * **Incision Rule:** Always avoid the "pinch" area (the tactile pad) to prevent painful scars. * **Kanavel’s Signs:** Remember these are for **Tenosynovitis**, not a felon (a common point of confusion in exams).

Q: What is the most important prognostic factor in melanoma?

Lymph node metastasis. **Explanation:** In the management of cutaneous melanoma, the presence of **Lymph node metastasis** is the single most important prognostic factor for overall survival. Once the disease spreads to the regional lymph nodes (Stage III), the 5-year survival rate drops significantly compared to localized disease, regardless of the primary tumor's characteristics. **Analysis of Options:** * **Lymph node metastasis (Correct):** This is the strongest predictor of survival. The status of the sentinel lymph node is the most important prognostic factor in patients with localized melanoma (Stage I and II) to determine their progression to Stage III. * **Breslow thickness (Incorrect):** While this is the most important prognostic factor for **localized** (Stage I and II) melanoma and determines the T-staging and excision margins, it is superseded by nodal status once metastasis occurs. * **Ulceration (Incorrect):** This is the second most important factor in T-staging after thickness. Its presence upgrades the stage (e.g., from T1a to T1b) and correlates with a worse prognosis, but it is not as significant as nodal involvement. * **Mitotic index (Incorrect):** Though an indicator of tumor proliferation and aggressive behavior, it is no longer the primary determinant for staging in the AJCC 8th edition, though it remains a secondary prognostic feature. **High-Yield Clinical Pearls for NEET-PG:** * **Breslow Thickness:** Measured from the granular layer of the epidermis to the deepest point of invasion (in mm). * **Clark Level:** Based on anatomical layers (obsolete for staging but still occasionally tested). * **Most common site:** Skin (Back in men, Legs in women). * **Most common subtype:** Superficial spreading melanoma. * **Most aggressive subtype:** Nodular melanoma. * **Sentinel Lymph Node Biopsy (SLNB):** Indicated for tumors >1 mm thick or >0.8 mm with ulceration.

Q: What is Zadek's procedure?

Resection of the complete nail with part of the nail bed. **Explanation:** **Zadek’s procedure** is a definitive surgical treatment for recurrent or severe **Ingrowing Toenail (Onychocryptosis)**. 1. **Why Option B is Correct:** The core principle of Zadek’s procedure is the **permanent ablation** of the nail. It involves the total avulsion (removal) of the nail plate followed by the **complete excision of the germinal matrix** (the part of the nail bed responsible for nail growth). By removing the germinal matrix, the nail is prevented from ever regrowing, thus providing a permanent cure for chronic recurrence. 2. **Why Other Options are Incorrect:** * **Option A:** Resecting only part of the nail bed is characteristic of a partial matricectomy (like the Wedge Resection or Winograd procedure), not Zadek’s, which is a total ablation. * **Option C:** The injection or application of phenol is known as **Phenolization**. While it also aims to destroy the germinal matrix, it is a chemical cauterization method, whereas Zadek’s is a formal surgical excision. * **Option D:** "Wide excision" is a vague term; Zadek’s is specifically targeted at the germinal matrix and the nail bed, not a wide local excision of surrounding healthy tissue. **High-Yield Clinical Pearls for NEET-PG:** * **Indication:** Reserved for patients with recurrent ingrowing toenails where conservative or less radical surgeries have failed. * **Anatomy:** The germinal matrix extends approximately 5-8 mm proximal to the visible nail fold; failure to excise this entire area leads to "spicule" regrowth. * **Alternative:** **Vandenbos procedure** is another surgical option that focuses on removing the overgrown skin (soft tissue) rather than the nail bed itself. * **Quaternary Ammonium Compounds:** Often used for preoperative skin preparation in these cases.

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

Abbe flap. ### 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 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 1

A 3.3 kg, 36-week baby girl was born prematurely after labor caused by ruptured membranes. Prenatal ultrasound revealed polyhydramnios at 26 weeks. Fetal echocardiogram was normal and amniocentesis was without genetic aberrance. On examination, there was a normal anus, and a nasogastric tube drained bile-stained fluid. The baby passed some mucus but no typical dark meconium. A chest and abdominal X-ray showed a "double bubble sign". What is the most likely diagnosis?

Accepted Answer

Duodenal atresia

Answer

Acute pancreatitis

Answer

Neonatal Hirschsprung's disease

Answer

Malrotation of midgut

Question 2

Which of the following statements regarding an axial flap is true?

Accepted Answer

It carries its own vessels within it.

Answer

It is kept in a limb.

Answer

It is a transverse flap.

Answer

It carries its own nerve within it.

Question 3

What is the most important reason for placing an alveolar bone graft in a cleft palate patient?

Accepted Answer

To create an eruptive pathway for the permanent canine

Answer

To improve pronunciation

Answer

To improve breathing efficiency

Answer

To improve feeding efficiency

Question 4

According to Veau's classification, which class does the diagrammatic representation of cleft palate belong to?

Accepted Answer

Class 1

Answer

Class 2

Answer

Class 3

Answer

Class 4

Question 5

Acanthosis nigricans is typically associated with which of the following conditions?

Accepted Answer

All of the above

Answer

Gastrointestinal malignancy

Answer

Lung cancer

Answer

Breast cancer

Question 6

What is the recommended incision for a felon?

Accepted Answer

Longitudinal

Answer

Transverse

Answer

Bilateral longitudinal

Answer

Fish mouth

Question 7

What is the most important prognostic factor in melanoma?

Accepted Answer

Lymph node metastasis

Answer

Breslow thickness

Answer

Mitotic index

Answer

Ulceration

Question 8

What is Zadek's procedure?

Accepted Answer

Resection of the complete nail with part of the nail bed

Answer

Resection of part of the nail with the nail bed

Answer

Injection of phenol at the base of the toenail

Answer

Wide excision of the nail

Question 9

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

Accepted Answer

Abbe flap

Answer

Naso labial flap

Answer

Cheek flap

Answer

Estlander's flap

Question 10

What is the most preferable graft for mandibular reconstruction?

Accepted Answer

Fibula graft.

Answer

Graft from anterior iliac crest.

Answer

Costochondral graft.

Answer

Any of the above.

Plastic and Reconstructive Surgery — MCQs

Plastic and Reconstructive Surgery — MCQs

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