This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': 'Recurrence is common in pleomorphic adenoma because of: \nSelect and explain. \nA. Metastasis, B. Incomplete capsule, C. Highly aggressive nature, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pleomorphic Adenoma:\nLocal enucleation should be avoided\xa0 because the entire tumor may not be removed or the capsule may be violated, resulting in seeding of\xa0 the tumor bed. With adequate surgery the prognosis is excellent, with a cure rate of more than 95%. The risk of recurrence appears to be lower for tumors of the minor glands. Conservative enucleation of parotid tumors often results in recurrence, with management of these cases made difficult as a result of multifocal seeding of the primary tumor bed. In such cases, multiple recurrences are not unusual and may necessitate adjuvant radiation therapy. Tumors with a predominantly myxoid appearance are more susceptible to recur than those with other microscopic patterns.\nKey Concept:\nOne of the characteristic is the microscopic presentation of tumour outside the Incomplete Capsule. So, the recurrence of pleomorphic adenoma is due to Incomplete Capsule.\nReference:\xa0ORAL AND MAXILLOFACIAL PATHOLOGY, Neville, FOURTH EDITION\xa0page no 446,447', 'role': 'assistant'}]