system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A patient presents with mediastinal mass with sheets of epithelial cells giving arborizing pattern of reactivity alongwith interspersed lympoid cells. The apt diagnosis would be -
assistant
The correct answer is  A thymoma is a tumor originating from the epithelial cells of the thymus that may be benign or malignant. Thymomas are frequently associated with the neuromuscular disorder myasthenia gravis;thymoma is found in 20% of patients with myasthenia gravis. Once diagnosed, thymomas may be removed surgically