You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Juvenile nasopharyngeal angiofibroma spreading to pterygomaxillary fossa is which stage? and explain in detail?
Ans. is .b, i.e., Stage IIlRef: Neuroradiologlt by Zimmerman p. 455; CT and MRI of the Whole Boily Shle p' 6101IA -+ Tumor limited to posterior nares or nasopharyngeal vaultIB + Extension into one or more Paranasal sinusesIIA -+ Minimal lateral extension through sphenopalatine foramen into medial pterygomaxillary fossa.IIB + Full occupation of pterygomaxillary fossa, di-splacing posterior wall of antrum forward; superior extension eroding orbital bones.IIC + Extension tt roogi ptetygomoilary fossa into cheek and temporal fossaIII -+ Intracranial extension