A 65-year-old patient undergoes colonoscopy for altered bowel habits. A 6 cm colonic mass is biopsied and histopathology shows adenocarcinoma confined to the mucosa with no lymph node or distant metastasis. What is the most appropriate TNM stage of this tumor?
A patient has burns involving the face, both upper limbs and front of the chest. What is the percentage of burns involved?
Cleft lip primary muscle repair is required in which of the following muscles?
INI-CET 2025 - Surgery INI-CET Practice Questions and MCQs
Question 11: A 65-year-old patient undergoes colonoscopy for altered bowel habits. A 6 cm colonic mass is biopsied and histopathology shows adenocarcinoma confined to the mucosa with no lymph node or distant metastasis. What is the most appropriate TNM stage of this tumor?
- A. Stage 0 (Correct Answer)
- B. Stage II
- C. Stage III
- D. Stage I
Explanation: ### **Explanation** The correct answer is **Stage 0**. #### **1. Why Stage 0 is Correct** In the TNM staging of colorectal cancer, the depth of invasion is the primary determinant of the 'T' stage. * **Carcinoma in situ (Tis):** This is defined as cancer cells confined to the **mucosa** (epithelium or lamina propria) without extension through the **muscularis mucosae** into the submucosa. * Because the colonic mucosa lacks lymphatic channels (which begin in the submucosa), tumors confined to the mucosa have essentially **zero risk of regional lymph node metastasis**. * According to the AJCC staging system, **Tis N0 M0** is classified as **Stage 0**. #### **2. Why Other Options are Incorrect** * **Stage I (T1-T2 N0 M0):** Requires invasion into the **submucosa** (T1) or the **muscularis propria** (T2). * **Stage II (T3-T4 N0 M0):** Occurs when the tumor invades through the muscularis propria into the subserosa (T3) or perforates the visceral peritoneum/invades adjacent organs (T4), but without nodal involvement. * **Stage III (Any T, N1-N2 M0):** This stage is defined by the presence of **regional lymph node metastasis**, regardless of the depth of T invasion. #### **3. High-Yield Clinical Pearls for INI-CET** * **The "No Lymphatics" Rule:** Unlike the stomach or esophagus, the colonic lamina propria has no lymphatic vessels. Therefore, "intramucosal carcinoma" in the colon is biologically equivalent to carcinoma in situ. * **Management:** Most Stage 0 lesions can be managed via **endoscopic mucosal resection (EMR)** or polypectomy rather than formal colectomy, provided margins are clear. * **TNM Staging Quick Recall:** * **T1:** Submucosa * **T2:** Muscularis propria * **T3:** Subserosa/Pericolonic fat * **T4:** Perforation of serosa or invasion of other organs.
Question 12: A patient has burns involving the face, both upper limbs and front of the chest. What is the percentage of burns involved?
- A. 30 to 37 (Correct Answer)
- B. 25 to 48
- C. 27 to 30
- D. 38 to 42
Explanation: ### **Explanation: Wallace’s Rule of Nines in Burn Assessment** The percentage of Total Body Surface Area (TBSA) involved in burns is calculated using **Wallace’s Rule of Nines**. This is a standardized tool used in emergency settings to estimate burn size and guide fluid resuscitation (Parkland Formula). #### **Calculation for this Patient:** * **Face (Head and Neck):** 9% (The entire head and neck is 9%; the face alone is approximately 4.5%, but in clinical exams, "face/head" is often treated as the full 9% unit or a significant portion thereof). * **Both Upper Limbs:** 9% (Left) + 9% (Right) = **18%** * **Front of Chest:** The entire anterior trunk is 18%. The "front of chest" (superior half of the anterior trunk) is **9%**. **Total Calculation:** 4.5–9% (Head/Face) + 18% (Arms) + 9% (Chest) = **31.5% to 36%**. This range fits perfectly within **Option A (30 to 37%)**. --- #### **Analysis of Incorrect Options:** * **Option B (25 to 48):** Too broad and exceeds the anatomical limits described. * **Option C (27 to 30):** This underestimates the total, likely by failing to account for the full surface area of both upper limbs. * **Option D (38 to 42):** This overestimates the burn, likely by incorrectly including the entire anterior trunk (abdomen) or the back. --- #### **High-Yield Clinical Pearls for NEET-PG/INI-CET:** * **Lund and Browder Chart:** The most accurate method for **pediatric patients** because it accounts for the larger proportional size of a child's head. * **Palmar Method:** The patient’s palm (including fingers) represents approximately **1% TBSA**. Useful for small or patchy burns. * **Fluid Resuscitation:** Remember that Rule of Nines is only used for **Partial Thickness (2nd degree)** and **Full Thickness (3rd degree)** burns. 1st-degree burns (erythema only) are **excluded** from TBSA calculations. * **Critical Areas:** Burns to the face, hands, feet, genitalia, or major joints are considered "Major Burns" regardless of TBSA percentage and require specialist referral.
Question 13: Cleft lip primary muscle repair is required in which of the following muscles?
- A. Levator palpebrae superioris
- B. Orbicularis oris (Correct Answer)
- C. Orbicularis oculi
- D. Masseter
Explanation: ***Orbicularis oris*** - The **orbicularis oris** muscle forms the main sphincter of the mouth and is interrupted in a cleft lip. Repair involves meticulous anatomical realignment of this muscle for correct function and appearance. - Dysfunction of this muscle in unrepaired cleft lip leads to **vermilion deficiency**, **cupid's bow distortion**, and poor feeding/speech. *Orbicularis oculi* - This muscle surrounds the eye and is responsible for blinking and closing the eyelid; it is not primarily affected in a standard cleft lip. - Though part of the facial musculature, its involvement is secondary, mainly due to potential nerve injury during extensive **craniofacial procedures**, not cleft lip repair. *Levator palpebrae superioris* - This muscle elevates the upper eyelid and is innervated by the **oculomotor nerve (CN III)**. It is not involved in cleft lip pathology or repair. - Its function is essential for vision, and damage results in **ptosis**, a concern unrelated to primary lip closure. *Masseter* - The masseter is a powerful muscle of mastication, innervated by the **trigeminal nerve (CN V)**. It is located in the cheek and is not part of the required functional repair for a cleft lip. - Its primary role is in **jaw closure (chewing)**, and its integrity is preserved during standard cleft lip repair procedures.