Correct spelling for the English word "oscheoma" is [ˌɒst͡ʃɪˈə͡ʊmə], [ˌɒstʃɪˈəʊmə], [ˌɒ_s_tʃ_ɪ__ˈəʊ_m_ə] (IPA phonetic alphabet).
A tumor of the scrotum, oscheoncus, oscheocele (2).
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.