<prompt> Juvenile nasopharyngeal angiofibroma spreading to pterygomaxillary fossa is which stage?Stage IStage IIStage IIIStage IV  <response>: 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 