What is Breast hamartoma?

Breast hamartoma, also known as fibroids of the adipose gland or breast in the breast (Breast within breast – characteristics of the breast) is a benign lesion of the breast gland. Hypertrophic breast tumors are often classified as rare benign tumors with an incidence of between 0.1 and 0.7%. [1].

Epidemiology: Usually appears in women> 35 years old

Clinical features: Extra breast tissue tumors are usually asymptomatic or present with a soft, painless mass. They also exhibit unilateral enlargement of the mammary glands and local mass cannot be palpated.


Hypertrophic breast tissue tumor shows benign proliferation of fibrous, glandular and adipose tissue (hence Fibro – adeno – lipoma) surrounded by thin connective tissue envelopes. All of these components are found in normal breast tissue, which is why these lesions are referred to as excess tissue tumors.

In general: the hyperplasia of the breast is slightly larger and softer than the typical fibroid. Well-defined, white-pink and fleshy (fleshy) excess tissue tumors, with golden islets.

Histopathology: they exhibit pushing boders with pseudo sheaths, and include a combination of varying amounts of nocturnal and epithelial components.

Photographic characteristics:

Pale photo: The well-defined, circular, oval block is surrounded by a thin shell. Includes both adipose and soft tissue density. Classic description: the expression “breast in the breast”

Mammography: A well-defined, circular, oval mass surrounded by a thin shell - hyperplasia of the breast tissue

Supersonic: Since they resemble normal breast tissue, the boundary is often difficult to discern. They may exhibit well-defined, solid lesions with no internal microcalcification. Most replies were a mixture of thick echoes and poor echoes. These lesions are soft and easy to squeeze.

Ultrasound: Because they resemble normal breast tissue, the boundary is often difficult to discern.

Differential diagnosis: The differential diagnosis of supernumerary tumors is usually not complicated, because of the very typical imaging manifestations. In rare cases, a differential diagnosis may include well-defined lesions:

  • Fibroids / goiter: No internal fat content.
  • Fatty: usually homogeneous fat, with very little soft tissue

Prognosis and attitude:

Although in most cases no recurrence of the tumor is noted, an excess of breast tissue tumor sometimes recurs after local resection. In addition, tubular or lobular carcinoma, localized or infiltrated randomly in cases of excess breast tissue has occasionally been reported. Therefore, surgery for parenchymal tumor is recommended when diagnosis is uncertain or patient is uncomfortable. Accurate pre-operative diagnosis can avoid unnecessary surgery and limit surgery rate, patient anxiety and healthcare costs. Although the FNA and core needle biopsy are accurate for diagnosing most breast diseases, cytology and core biopsy may be inaccurate. accurate, inconclusive, or nonspecific in the diagnosis of excess breast tissue. The mammographic properties of the parenchymal tumor are well-described, some authors suggest that this tumor can be accurately diagnosed with mammography, so surgical resection is not necessary. However, most Chinese women (like Vietnamese) have thicker and smaller breast tissue than Western women. Breast ultrasound is often used when diagnosing breast lesions in Chinese women because the sensitivity of the mammogram is limited to women with thick breast tissue.


  1. Chao TC, Chao HH, Chen MF (2007), “Sonographic features of breast hamartomas”. J Ultrasound Med, 26 (4), pp. 447-52; quiz 453.

2.https: //radiopaedia.org/articles/breast-hamartoma

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