This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oesophagus, Subject name: Surgery
Best result in esophageal carcinoma in situ with: 
Select and explain. 
A. Endoscopic mucosal resection, B. THE, C. TTE, D. PDT
A: Endoscopic mucosal resection
Answer: A: Endoscopic mucosal resection 
Explanation: Ans. (a) Endoscopic mucosal resectionRef Sabiston 20th Edition, Page 1027-1035Treatment in cancer esophagus:High grade dysplasiaEndoscopic mucosal resection or esophagectomyLocalized esophageal cancer# T1 - Transhiatal esophagectomy # T2/T3 - Neoadjuvant ChemoRT+ Surgery# Cervical esophagus- Only ChemoRT# Thoracic Esophagus and Lower Esophagus - Surgery/ChemoRTLocally advanced inoperableChemoRT/SurgeryMetastatic diseaseOnly ChemoRTMalignant TEFCoated SEMS (Self Expanding Metallic Stents)