Useful mnemonics for remembering the differentials for pituitary region masses (in addition to macroadenoma) are:
SATCHMO/STOMACH 1,2
MOuSTACHE
SOME ACTH HORMONE
Mnemonics
SATCHMO/STOMACH
S: sarcoid
A: aneurysm
T: teratoma or tuberculosis (and other granulomatous diseases)
H: hypothalamic glioma, hamartoma of tuber cinereum, histiocytosis
Some prefer adding an E at the end and moving 'histiocytosis' to this last letter as:
E: eosinophilic granuloma or epidermoid/dermoid/teratoma
Some prefer to reorder the mnemonic to spell 'STOMACH' instead.
MOuSTACHE
S: sarcoidosis, sellar tumor (pituitary adenoma)
T: teratoma or tuberculosis (and other granulomatous diseases)
A: aneurysm
C: craniopharyngioma, cleft cyst (Rathke), chordoma
E: eosinophilic granuloma or epidermoid/dermoid/teratoma
SOME ACTH HORMONE
S: sarcoidosis
A: aneurysm
T: teratoma
History and etymology
As the word Satchmo is best known as the nickname of Louis Armstrong, it is probably best to omit the ending E, especially as the term histiocytosis is preferred to eosinophilic granuloma.