- cyst - a closed sac that develops abnormally in some body structure
--1 is a kind of pathology
--1 has particulars:dermoid cyst; galactocele; hemorrhagic cyst, blood cyst, hematocyst; hydatid; nabothian cyst, nabothian follicle; ovarian cyst; ranula; sebaceous cyst, pilar cyst, wen, steatocystoma - vesicle, cyst - a small anatomically normal sac or bladderlike structure (especially one containing fluid)
--2 is a kind of sac
--2 has particulars:lacrimal sac, tear sac, dacryocyst; Golgi body, Golgi apparatus, Golgi complex, dictyosome; blister, bulla, bleb; follicle; liposome; seminal vesicle - vesicle, cyst - a small anatomically normal sac or bladderlike structure (especially one containing fluid)