I have 2 questions from the Endocrine system. How does Cushing's syndrome lead to amenorrhea? 21-alpha-hydroxylase def is the most common adrenal steroid def. It causes female pseudohermaphroditism. Now, even 11-beta-hydroxylase def also dec testosterone levels. So does 11-beta-hydroxylase def also cause female pseudohermaphroditism? I think it does, but it doesn't specifically state in FA p.277. What do you think? Mnemonic: I've made a mnemonic for the primary brain tumors on FA p. 392. Adult peak incidence: Glia's Men Show (Schwannoma) Oligo's Pit. I couldn't come up with something better. If someone has a better mnemonic, let me know. Childhood peak incidence: Pile the Medulla UpIn (Epen.-Ependymoma) He-man's Cranium.