Crossword Genius

Blisterlike sac in the body (4)

Ross

I believe the answer is:

cyst

(Other definitions for cyst that I've seen before include "Small bladder-like sac" , "Small sac in body (that may form abnormal lump)" , "Fluid filled sac" , "Abnormal closed sac in a body" , "Abnormal body sac containing fluid" .)

I've seen this clue in the Sydney Morning Herald.
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