Fibrous dysplasia of the sphenoid sinus: headache relieved by surgical excision-a case report.

Fibrous dysplasia (FD) is an uncommon benign bone disorder of unknown etiology in which normal medullary bone is replaced by fibrotic and osseous tissue. FD of paranasal sinuses is usually secondary to extension from adjacent bones. It is rarely limited to the sinuses, let alone limited to the sphenoid sinus.

Neurilemmoma of fronto-ethmoid paranasal sinuses: aggressive anterior skull base destructing tumor-a case report.

Neurilemmomas (Schwannomas) of sinonasal tract are very unusual. They are benign, slow-growing, usually solitary encapsulated perineural tumors. They arise from Schwann cells of the neural sheath of the peripheral nervous system including motor, sensory and autonomic nerves.