Plastic and Reconstructive Surgery Practice Questions

Q: Which of the following statements regarding cleft lip and palate is incorrect?

Antenatal diagnosis is not possible.. ### Explanation **1. Why Option D is the Correct (Incorrect Statement):** Antenatal diagnosis of cleft lip and palate **is possible** and is now a standard part of prenatal screening. * **Cleft Lip:** Can be detected via **2D Ultrasound** as early as the late first trimester (13–14 weeks), though it is more reliably seen in the second trimester (18–22 weeks) during the anomaly scan. * **Cleft Palate:** Isolated cleft palate is harder to detect on 2D USG but can be identified using **3D/4D Ultrasound** or **Fetal MRI**, which provide better visualization of the secondary palate. **2. Analysis of Other Options:** * **Option A (Correct Statement):** The etiology is **multifactorial**. Genetic factors (e.g., *IRF6* gene) and environmental triggers (maternal smoking, alcohol, anticonvulsants like phenytoin, and folic acid deficiency) play significant roles. * **Option B (Correct Statement):** Incidence varies by ethnicity. It is highest in **Asian/Native American** populations (1:500), intermediate in Caucasians (1:1000), and lowest in African populations (1:2500). * **Option C (Correct Statement):** Combined **Cleft Lip + Palate (CLP)** is the most common presentation (approx. 45%), followed by isolated Cleft Palate (30%) and isolated Cleft Lip (25%). **3. High-Yield Clinical Pearls for NEET-PG:** * **Rule of 10s (Millard’s Criteria for Cheiloplasty):** 10 weeks of age, 10 lbs weight, 10 g/dL Hemoglobin. * **Surgical Timing:** * Cleft Lip repair: **3–6 months** (Modified Millard’s Rotation-Advancement flap). * Cleft Palate repair: **6–12 months** (Wardill-Kilner or Bardach technique) to allow for speech development but prevent midface growth retardation. * **Embryology:** Cleft lip is a failure of fusion between the **medial nasal process** and **maxillary process**.

Q: To assess the perfusion in a free flap, what is the best technique?

Prick test. ### Explanation Monitoring free flap perfusion is critical for the early detection of microvascular compromise (arterial insufficiency or venous congestion). **Why the Prick Test is the Correct Answer:** The **Prick Test (Clinical Monitoring)** remains the **gold standard** and the most reliable technique for assessing flap viability. It involves pricking the flap with a 25-gauge needle. * **Normal:** Bright red blood within 2–3 seconds indicates healthy perfusion. * **Arterial Insufficiency:** No blood or very slow, pale flow. * **Venous Congestion:** Rapid, dark/cyanotic blood flow. Clinical assessment (color, temperature, capillary refill, and the prick test) is superior to most technologies because it is instantaneous, cost-effective, and highly accurate in experienced hands. **Analysis of Incorrect Options:** * **A. Pulse Oximetry:** While it measures oxygen saturation, it is often unreliable in flaps due to low pulsatile flow and difficulty in probe fixation. * **B. Laser Doppler Velocitometry:** This measures capillary blood flow using the Doppler shift. While sensitive, it is prone to "motion artifacts" and high false-alarm rates, making it less definitive than clinical assessment. * **C. Fluorescein and Dermal Fluorometry:** This involves IV injection of dye to check for fluorescence under a Wood’s lamp. It is invasive, can cause allergic reactions, and cannot be used for continuous monitoring. **Clinical Pearls for NEET-PG:** * **Most common cause of flap failure:** Venous thrombosis (more common than arterial). * **Critical Period:** Most flap failures occur within the first **24–48 hours**. * **Handheld Doppler:** Useful for identifying the "pedicle signal," but a positive signal does not always guarantee distal tissue perfusion. * **Gold Standard for Monitoring:** Clinical observation (Color, Temperature, Capillary Refill, and Prick Test).

Q: At what age is cleft lip repair commonly performed?

3-6 months. **Explanation:** The timing for cleft lip repair is primarily guided by the **"Rule of 10s,"** which ensures the infant is physiologically stable enough to undergo general anesthesia and that the tissues are robust enough for a meticulous surgical repair. **Why 3-6 months is correct:** While the "Rule of 10s" suggests surgery can occur as early as 10 weeks, the standard clinical window is **3 to 6 months**. This period allows the infant to gain sufficient weight and hemoglobin levels, reducing anesthetic risk. Specifically, the Millard rotation-advancement flap (the most common technique) is ideally performed during this window to achieve optimal aesthetic and functional outcomes for the orbicularis oris muscle. **Analysis of Incorrect Options:** * **0-3 months:** Performing surgery too early (neonatal period) increases anesthetic risks due to immature hepatic and renal systems. While "neonatal repair" exists, it is not the standard of care for NEET-PG purposes. * **6-9 months & 9-12 months:** Delaying repair beyond 6 months is unnecessary and can interfere with early bonding and feeding. However, these timeframes are more relevant for **Cleft Palate repair**, which is typically performed between **6-12 months** (before the child develops significant speech patterns). **High-Yield Clinical Pearls for NEET-PG:** * **The Rule of 10s (Wilhelmmesen and Musgrave):** Weight > 10 lbs, Hemoglobin > 10 g/dL, WBC count 10 weeks. * **Surgical Technique:** **Millard’s Rotation-Advancement Flap** is the gold standard for unilateral cleft lip. **Tennison-Randall (Triangular flap)** is an alternative. * **Cleft Palate Timing:** Usually repaired at **6–12 months** to prevent speech defects (velopharyngeal insufficiency). * **Sequence of Management:** Lip repair (3-6m) → Palate repair (6-12m) → Bone grafting (9-11 years) → Rhinoplasty (after puberty).

Q: What is true about cleft lip?

Unilateral cases are more common on the left side.. ### Explanation **1. Why Option D is Correct:** Epidemiological studies consistently show that unilateral cleft lip is more common than bilateral, and among unilateral cases, the **left side** is affected significantly more often (ratio of approximately 2:1). While the exact embryological reason remains debated, this is a high-yield statistical fact frequently tested in surgical exams. **2. Analysis of Incorrect Options:** * **Option A:** Cleft lip occurs due to the failure of fusion between the **Maxillary process** and the **Medial Nasal process**. The frontal process contributes to the forehead, while the lateral nasal processes form the alae of the nose. * **Option B:** Cleft palate can be associated with both unilateral and bilateral cleft lips. In fact, approximately 70% of unilateral cleft lips are associated with a cleft palate. * **Option C:** Cleft lip is typically repaired at **3 to 6 months** of age, not in the neonatal period. Surgeons often follow the **"Rule of 10s"** to determine fitness for surgery (10 weeks old, 10 lbs weight, and 10 g/dL hemoglobin). **3. Clinical Pearls for NEET-PG:** * **Incidence:** Cleft lip (with or without palate) is more common in **males**, whereas isolated cleft palate is more common in **females**. * **Most Common Type:** Unilateral incomplete cleft lip. * **Surgical Technique:** The most common procedure for unilateral repair is the **Millard Rotation-Advancement Flap**. For bilateral repair, the **Manchester or Millard repair** is used. * **Cleft Palate Repair:** Usually performed between **9 to 18 months** to allow for maxillary growth but before significant speech development begins (Wardill-Kilner or Bardach technique).

Q: Poland syndrome is characterized by all of the following abnormalities except:

Absence of the latissimus dorsi muscle. **Explanation:** Poland Syndrome is a rare congenital anomaly characterized by the underdevelopment or absence of the chest wall muscles and associated limb deformities on one side of the body. **Why Option A is the correct answer:** The hallmark of Poland Syndrome is the **absence of the sternocostal head of the pectoralis major muscle**. While other muscles like the pectoralis minor, serratus anterior, or latissimus dorsi *can* occasionally be hypoplastic, the **latissimus dorsi is typically present** and is, in fact, the **muscle of choice for reconstructive surgery** (transposition flap) to correct the chest wall defect in these patients. Therefore, its absence is not a characteristic feature. **Analysis of other options:** * **Option B (Absence of pectoralis major):** This is the defining feature of the syndrome. The sternocostal head is most commonly missing, leading to an asymmetrical chest appearance. * **Option C (Syndactyly):** Ipsilateral hand involvement is common, most frequently manifesting as **symbrachydactyly** (short, webbed fingers). * **Option D (Shortened digits):** Brachydactyly (shortening of the fingers, including the index finger) occurs due to hypoplasia of the middle phalanges. **High-Yield Clinical Pearls for NEET-PG:** * **Etiology:** Thought to be caused by a vascular insult (interruption of blood supply) in the **subclavian artery** during the 6th week of gestation. * **Laterality:** More common on the **right side** (approx. 75% of cases) and more frequent in males. * **Associated Findings:** May include nipple/areola hypoplasia (athelia/thelarche), rib anomalies, and occasionally **Möbius syndrome** (cranial nerve palsies). * **Dextrocardia:** If Poland syndrome occurs on the left side, it is sometimes associated with dextrocardia.

Q: The Abbe-Estlander flap is based on which artery?

Labial artery. The **Abbe-Estlander flap** is a classic cross-lip arterialized flap used for reconstructing full-thickness defects of the upper or lower lip. ### **Explanation of the Correct Answer** The flap is based on the **labial artery** (specifically the superior or inferior labial artery, depending on the donor site). These arteries are branches of the facial artery that run within the orbicularis oris muscle, approximately 2–3 mm deep to the vermilion-mucosal junction. The robust axial blood supply from the labial artery allows for a narrow vascular pedicle, which enables the flap to be rotated 180 degrees into the defect while maintaining viability. ### **Analysis of Incorrect Options** * **A. Facial artery:** While the labial arteries originate from the facial artery, the flap itself is specifically pedicled on the labial branch. In surgical anatomy, the most specific vessel is the correct answer. * **C. Maxillary artery:** This is a terminal branch of the external carotid artery that supplies deep facial structures (like the muscles of mastication and nasal cavity), not the superficial lip. * **D. Ascending pharyngeal artery:** This supplies the pharynx and soft palate; it does not contribute to the vascularity of the lips. ### **High-Yield Clinical Pearls for NEET-PG** * **Abbe Flap:** Used for **central** lip defects. It is a two-stage procedure (the pedicle is divided after 2–3 weeks). * **Estlander Flap:** Used for defects involving the **oral commissure** (corner of the mouth). It is a one-stage procedure but results in a rounded commissure that may require secondary commissuroplasty. * **Rule of Thirds:** These flaps are typically indicated for defects involving **1/3 to 2/3** of the lip width. * **Innervation:** The flap is denervated initially but may regain some sensory and motor function over several months.

Question 1

What will not happen with inadequate resuspension?

Accepted Answer

Malar prominence

Answer

Temporal hollowing

Answer

Angle of mouth drooping

Answer

Witch chin

Question 2

Which of the following statements regarding cleft lip and palate is incorrect?

Accepted Answer

Antenatal diagnosis is not possible.

Answer

They have possible genetic and environmental predispositions.

Answer

Their frequency varies among different population groups.

Answer

Cleft lip with palate is the most common combination.

Question 3

To assess the perfusion in a free flap, what is the best technique?

Accepted Answer

Prick test

Answer

Pulse oximetry

Answer

Laser Doppler velocitometry

Answer

Fluorescein and dermal fluorometry

Question 4

At what age is cleft lip repair commonly performed?

Accepted Answer

3-6 months

Answer

0-3 months

Answer

6-9 months

Answer

9-12 months

Question 5

What is true about cleft lip?

Accepted Answer

Unilateral cases are more common on the left side.

Answer

Occurs due to a defect in the fusion of the frontal and nasal processes.

Answer

Only bilateral cases are associated with cleft palate.

Answer

Is repaired in the neonatal period.

Question 6

Poland syndrome is characterized by all of the following abnormalities except:

Accepted Answer

Absence of the latissimus dorsi muscle

Answer

Absence of the pectoralis major muscle

Answer

Syndactyly of digits

Answer

Shortened index fingers

Question 7

In the treatment of hand injuries, what is the greatest priority?

Accepted Answer

Restoration of skin cover

Answer

Repair of tendons

Answer

Repair of nerves

Answer

Repair of blood vessels

Question 8

What is a partial-thickness skin graft also known as?

Accepted Answer

Thiersch graft

Answer

Wolfian graft

Answer

Pedicle graft

Answer

Patch graft

Question 9

All of the following statements about cleft palate are true, EXCEPT:

Accepted Answer

Approximately 50% of patients achieve normal speech following surgical repair.

Answer

Surgery is typically recommended around 1 year of age.

Answer

Cleft palate is associated with an increased risk of hearing loss.

Answer

Cleft palate is associated with cleft lip in approximately 45% of cases.

Question 10

The Abbe-Estlander flap is based on which artery?

Accepted Answer

Labial artery

Answer

Facial artery

Answer

Maxillary artery

Answer

Ascending pharyngeal artery

Plastic and Reconstructive Surgery — MCQs

Plastic and Reconstructive Surgery — MCQs

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