โ Scribed by Hatai, Shinkishi
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## Abstract Only 4% of peripheral nerve sheath tumors of the head and neck occur in the paranasal sinuses. The most commonly involved sinus is the maxillary antrum and the most common histologic type is benign schwannoma. Two new cases of schwannoma occurring in the sphenoid and maxillary sinuses a
The two main peripheral nerve sheath tumors found in patients with neurofibromatosis, type 1 (NF1), are neurofibroma, a benign tumor, and malignant peripheral nerve sheath tumor (MPNST). The tumors are related in that most MPNSTs are thought to arise by malignant transformation of neurofibromas. Suc
The investigation which forms the subject matter of this paper was the outcome of three observations: (i) the great variation in size of the funiculi comprising peripheral nerves ; observations on 80 specimens have revealed diameters ranging from 0.04 to 3 m m ; (ii) the variation in tKickness of th