due to the rarity of malignant schwannomas , their infrequent occurrence in young persons in the absence of von recklinghausen 's neurofibromatosis , and the presence of schistosomal ovideposition , the possible role of schistosomal infection in the development of this malignancy is discussed .
C0751690
malignant schwannomas
C0085113
von recklinghausen 's