--> Subperiosteal has vowels 'ea' together mispronounced as 'e'
Word contains consecutive vowels 'EA' in between alphabets subperiost & l is misspelled as 'E'
Wrong Spelling:  subperiost-e-l 
Correct Spelling:  subperiost-ea-l 
Check more misspelled words of Subperiosteal to spell it correct.