What does fibrocystic mean?
"Fibrocystic" is an adjective used almost exclusively in medicine to describe tissue that contains both fibrous overgrowth and small fluid-filled cysts. Its dominant use by far is in the phrase "fibrocystic breast changes" (historically called fibrocystic breast disease), an extremely common benign condition affecting as many as half of women at some point, in which breast tissue develops lumpy, tender areas of fibrous thickening and cysts. The word is built from two anatomical roots: "fibro-", referring to fibrous connective tissue, and "-cystic", referring to cysts. Though the older term "disease" persists, clinicians now favor "changes" or "condition" to signal that the state is not dangerous. For general readers, encountering "fibrocystic" most often signals a reassuring diagnosis rather than an alarming one.
adjectiveRelating to or characterized by the presence of both fibrous tissue and cysts, especially in breast tissue. Most commonly used in the medical phrase "fibrocystic breast disease" (also called fibrocystic changes or fibrocystic condition), a common benign condition.
- Relating to tissue characterized by both fibrous overgrowth and the formation of cysts, used especially of benign breast conditions.
"Her doctor reassured her that fibrocystic changes in the breast are benign and extremely common."
"Mammography can be more difficult to interpret in patients with fibrocystic breasts."
"The biopsy confirmed the lump was simply the result of fibrocystic change, not cancer."
Despite its alarming name, "fibrocystic breast disease" isn't a disease at all — it's so common that doctors increasingly prefer the reassuring term "fibrocystic changes."
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of fibrocystic
"Fibrocystic" combines "fibro-", from Latin "fibra" meaning fiber, with "cystic", from Greek "kystis" meaning bladder or pouch, via the medical combining form "cyst." Both elements entered scientific vocabulary through New Latin medical terminology, and the compound follows the standard pattern of descriptive adjectives formed in 19th- and 20th-century pathology to characterize mixed tissue states. Cognates sharing these roots include "fibrosis" and "fibroma" on the fibro- side, and "cyst," "cystic," and "encyclopedia's" unrelated namesake aside, "cystocele" on the cyst side.
How fibrocystic is actually used
Strictly a medical term with no everyday figurative use. Because "disease" in the traditional name "fibrocystic breast disease" wrongly implies pathology, modern medical literature prefers "fibrocystic changes," "fibrocystic condition," or "fibrocystic breast disorder." Always attributive in practice — it modifies a noun such as "breast," "changes," or "tissue."
Easily confused with fibrocystic
"Fibroid" refers to a benign fibrous tumor, typically of the uterus, while "fibrocystic" describes tissue containing both fibrous thickening and fluid-filled cysts.
"Fibrotic" describes tissue hardened by excess fibrous growth alone, whereas "fibrocystic" specifically implies a combination of fibrous and cystic changes.