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 35-year-old man, with a history of neurofibromatosis type 2 (NF2) diagnosed 2 years ago, presents with hearing loss in the right ear and tinnitus. Patient says that symptoms have been gradually progressive. He has difficulty hearing speech as well as loud sounds. He also gives a history of occasional headaches and vertigo on and off for 1 month, which is unresponsive to paracetamol. His vitals include: blood pressure 110/78 mm Hg, temperature 36.5°C (97.8°F), pulse 78/min and respiratory rate 11/min. Tuning fork tests reveal the following:
  Left Right
Rinne’s test  Air conduction > bone conduction  Air conduction > bone conduction
Weber test Lateralized to left ear 
Other physical examination findings are within normal limits. An MRI of the head is ordered which is as shown in image 1. A biopsy is done which shows cells staining positive for S100 but negative for glial fibrillary acidic protein (GFAP). The histopathological slide is shown in image 2. What is the most likely diagnosis?
assistant
Schwannoma