Breast - nonmalignant
Benign tumors / changes
Carney syndrome

Author: Monika Roychowdhury, M.D., FCAP (see Authors page)

Revised: 17 January 2017, last major update December 2016

Copyright: (c) 2002-2017,, Inc.

PubMed search: carney [title] breast

Cite this page: Carney syndrome. website. Accessed June 27th, 2017.
Definition / general
  • Also called Carney complex
Clinical features
  • Myxomas / myxoid fibroadenomas, spotty skin pigmentation and endocrine overactivity
  • Also intraductal breast adenoma, spotty pigmentation present from birth, endocrine overactivity, psammomatous melanotic schwannoma (Am J Surg Pathol 1991;15:722)
    • Ductal adenoma: palpable painless mass near the areola
    • Myxomas occur in heart, but can also occur on the skin (eyelid, external ear canal and nipple) and breast
    • Myxomas occur as nodular masses
    • ~40% of the patients have multiple and bilateral breast myxomas (breast myxomatosis)
  • Bone lesions, osteochondromyxomas or “Carney bone tumor” may also occur
Radiology description
  • Myxoma: on mammography appears as well defined, noncalcified, isodense or hypodense mass
  • Ultrasound may show well circumscribed, ovoid mass to complex cystic lesion
  • Ductal adenoma: soft tissue tumor with coarse microcalcifications, which may be irregular in a linear orientation
Radiology images
Images hosted on other servers:

Solid, ovoid, well circumscribed, hypoechoic lesion in breast

nodules corres-
ponding to myxoid

Two low density
masses in female
patient with
Carney complex
Clinical images
Images hosted on other servers:

Pedunculated, flesh
colored cutaneous
myxoma on trunk

Microscopic (histologic) description
  • Myxoma: in reticular dermis, bland stellate and short spindle shaped cells in myxoid (mucinous) stroma with prominent blood vessels
  • Ductal adenoma: tubules (longitudinal and parallel) in fibrous stroma
    • The tubules are lined by a single row of uniform epithelial cells with vesicular nuclei and eosinophilic cytoplasm
    • Secretions may be present in the tubular lumen
Microscopic (histologic) images
Images hosted on other servers:

Breast myxoma at 5× magnification

200×; H&E stain

Polypoid neoplasm of
fibrillary collagen and uniform
stellate cells within abundant
connective tissue mucin