Breast pathology

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The breast is an important organ for the continuance of the species and one that pathologists see quite often because it is often afflicted by cancer. Before women started smoking in large numbers, it was the number one cause of cancer death in women (in Canada).

Diagram of the structure of breast. (CRUK/WC)

Fortunately, breast cancer, these days, has a relatively good prognosis if it is detected early... and this is why there are week-ends to end breast cancer -- there are large numbers of breast cancer survivors that are well, wealthy and can advocate for better care and research into breast cancer.

Clinical

Classic presentation:

  • Nipple discharge.
  • Pain.
  • Breast lump/mass.
  • New nipple inversion.
  • Skin changes, e.g. peau d'orange.

Most common presentation:

  • Abnormal/suspicious screening mammogram - suspicious microcalcifications and/or suspicious mass.

Breast cancer screening

Breast cancer screening, for normal risk individuals, starts at age 50 in Canada. In the USA, breast screening starts at age 40.

Radiologic screening is less effective in younger individual as:

  1. The breast is more dense and thus radiologically more difficult to interpret, and
  2. The incidence of breast cancer is lower.

Breast radiology

BI-RADS = Breast Imaging Reporting And Data System:[1]

  • 0: Incomplete - come back for more imaging (radiologist cha-ching).
  • 1: Negative.
  • 2: Benign finding(s).
  • 3: Probably benign -- often short follow-up.
  • 4: Suspicious abnormality -- needs biopsy.
  • 5: Highly suggestive of malignancy.
  • 6: Pathologist says there is a malignancy.

Specimens

Breast comes in three main flavours:

  1. Core needle biopsy (CNB).
  2. Lumpectomy.
  3. Modified radical mastectomy.

Note:

Core needle biopsy

Work-up of CNBs is dependent on the clinical abnormality:[2]

  1. Mass lesion - usu. obvious what is going on; typically 3 levels.
  2. Calcifications - abnormality may be very small; typically 10 levels.

Lumpectomy

Lumpectomies are usually oriented with short and long suture; short is typically superior (aspect) and long is typically lateral (aspect).

Modified radical mastectomy

  • Usually done with sentinel lymph node biopsy - as one cannot go back later to do this.

Normal

Resting

  • Glands -- normally has two cell layers (like the prostate).
    • Myoepithelial cells
      • Frequently spindle-like, often hard to see.
    • Secretory cells.
  • Stroma:
    • Not cellular.
    • Not myxoid.

May be present:

  • Calcification:
    • Purple globs (with concentric rings) on H&E = calcium phosphate.
      • Q. How to remember? A. Purple = Phosphate.
    • Calcium oxalate visible with (light) polarization - not assoc. with malignancy.
    • Often in the lumen of a gland, may be in the stroma.
    • Calcific material typically has a well-demarcated border +/- "sharp corners".
    • Radiologists can pick-up calcs (calcifications) that are approximately 100 micrometers; if "calcs" is on the requisition one needs to find calcs this size.[3]
      • The large calcs seen on radiology are approximately 1/5 - 1/6 the size of a HPF, if the field of view (FOV) is ~0.55 mm (as is the case with 22 mm-10x eye pieces and a 40x objective).

Image:

Notes:

  • The architecture is more important than the cytologic features in the diagnosis of malignancy in the breast;[4] low grade tumours have distorted architecture but normal/near normal cytology.

Lactational changes

  • AKA secretory change, AKA lactational adenoma, AKA lactating adenoma [5]

General

  • Lactational adenoma generally arises in during or in the few weeks after pregnancy.
  • May be present focally in non-pregnant females.
  • "Lactational adenoma"- circumscribed mass displacing the normal breast architecture (hyperplasia plus functional/physiologic change)
  • "Lactational change"- normal breast tissue architecture preserved (functional/physiologic change).

ASIDE:

  • Some believe lactational change and secretory change aren't the same...
    • Lactational change = only in lactation.
    • Secretory change = other times.
  • This hair splitting is clinically irrelevant-- both are benign. Also, experts use the terms interchangeably.[6]

Microscopic

Features:[7]

  • Glands dilated.
  • Increased number of lobules.
    • Relative decrease in intralobular and extralobular stroma.
  • Luminal cells enlarged.
    • Vacuolated cytoplasm.
    • Hobnail morphology - hang into the lumen.
  • Myoepithelial cells indistinct - after second trimester.
  • Lactational "adenoma" may undergo infarction - Imagine what an infarcted lactational adenoma could look like in a FNA specimen!

DDx:

Images

www:

Where to start

The following entities are a starting point for understanding routine breast pathology & some of challenges in breast pathology:

  1. Apocrine change.
    • Voluminous pink cytoplasm.
    • Central round nucleus
      • Prominent nuclear membrane.
      • Prominent, often single nucleolus.
  2. Columnar cell change.
    • Columnar cells with blebs ("snouts") - often have calcifications (purple).
    • If the columnar cells shows low to intermediate grade atypia the process is termed "flat epithelial atypia"
    • If higher grade atyia is present the lesion is termed "flat DCIS" (clinging carcinoma)
  • Breast - Flat Atypia (SKB)

    1. Duct ectasia
      • Dilation of large ducts secondary to luminal obstruction by inspissated secretions
      • Presentation
        • ~age 40-50, possibly with cheesy nipple discharge
      • Pathology
        • Duct lumen dilated and containing foamy macrophages
        • Necrosis/shedding of epithelium
        • If duct rupture: chronic and granulomatous inflammation of periductal region
        • Fibrotic thickening of duct wall
    1. Fibroadenoma.
      • Abundant myxoid (light/blanched) stroma - very common.
    2. Florid epithelial hyperplasia.
      • Too many cells in a duct, cells overlap & form slit-like spaces.
    3. Ductal carcinoma in situ (DCIS).
      • Too many cells in a duct, nuclei do not touch - "cells are spaced".
      • Cells line-up around ovoid/circular spaces - "punch-out" appearance/"cookie cutter" look.
      • Myoepithelial cells present.
    4. Invasive ductal carcinoma.
      • Bread & butter cancer - in sheets or glands.
    5. Lobular carcinoma.
      • Dyscohesive cells - can easily be missed.
    6. Tubular carcinoma.
      • Glands have one cell layer... but near normal appearance.

    The key to breast pathology is... seeing the two cell layers (at low power). The myoepithelial layer is hard to see at times and that is the challenge.


    Additional resources

    • Breast Pathology Info [1]
    • Digital Atlas of Breast Pathology [2]
    • Pathology Outlines - Breast Nonmalignant [3]
    • Pathology Outlines - Breast Malignant [4]
    • WebPathology - Breast [5]

    Common diagnoses - overview

    • Normal.
    • Benign.
      • Columnar cell change.
        • Calcification often in lumen.
    • Neoplastic.
      • Benign neoplastic:
      • Malignant neoplastic:
        • Epithelial/myoepithelial - most common, e.g. ductal carcinoma, lobular carcinoma.
        • Breast stroma - malignant phyllodes tumour.
        • Stromal, e.g. angiosarcoma - quite rare.

    Major Pathologic Patterns

    General classification

     
     
     
     
     
     
     
     
     
     
    Breast pathology
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
    Stromal
    pathology
     
     
     
     
    Miscellaneous
     
     
     
     
    Glandular
    pathology
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
    Myxoid
     
     
     
    Long slit-like
    spaces
     
     
     
     
    Simple
    epithelium
     
    Dilated
     
    Cellular lesions
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
    Fibroadenoma
     
    Malignant
    features
     
    Benign features
     
     
    Tubular
    carcinoma
     
    FEA, FCC,
    CCC
     
    FEHUT, Neoplastic,
    Malignant
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
    Malignant
    phyllodes
     
    Benign phyllodes
     
     
     
     
     
     
     
     
     
     
     
     
     

    Notes:

    • The challenges in breast pathology are in: the Simple epithelium category and the Cellular lesions category.
    • Neoplastic includes: ADH and LDH.
    • Malignant includes: DCIS, LCIS, ductal carcinoma (DC) and lobular carcinoma (LC), some papillary lesions.
    • Lobular carcinoma (a pitfall) may appear to be a stromal problem, i.e. the stroma looks too cellular.
    • Miscellaneous includes rare tumours of the breast that do not fit into another category, i.e. metastases, lymphomas, melanoma, sarcomas. Skin-related pathology is dealt within the dermatologic neoplasms article. Paget disease of the breast, which may be seen in the context of malignant breast lesions, is discussed in its own article.

    Cellular lesions

     
     
     
     
     
     
     
     
     
     
     
     
    Cellular lesions
    (Glandular)
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
    Equal spacing,
    punched-out
     
    Streaming, periph.
    slit-like spaces.
     
    Discohesive cells,
    expanded gl.
     
    Single cells
    or single file
     
    Fibrovascular
    cores
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
    Ductal lesion
     
    FEHUT
     
    Lobular lesion
     
    Lobular carcinoma
     
    Papillary lesions
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
    Two cell layers
     
    One cell layer
     
    <50% of gl.
     
    >50% of gl.
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
    Ductal non-inv.
    neoplasm
     
    Ductal carcinoma
     
    ALH
     
    LCIS
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
    Large extent
     
    Small extent
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
    DCIS
     
    ADH
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     

    Notes:

    • The largest challenge is: differentiating between the first two categories on level 2, i.e. equal spacing' vs. streaming.
    • The fibrovascular cores must arise from a tuft, i.e. if they are arising directly from the wall of glands only it is likely papillary DCIS.

    Papillary lesions

     
     
     
     
     
     
     
     
     
     
    Papillary lesions
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
    Myoepithelial cells
    present
     
     
     
     
     
     
     
     
     
    Myoepithelial cells
    absent
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
    Unremarkable
    papillae
     
     
     
     
     
    Atypia or arch. abnorm.
    or cellular proliferation
     
     
     
     
     
    Neoplastic cells
    present
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
    Benign
    intraductal
    papilloma
     
    High grade atypia
     
    Low grade atypia
    or abnorm. arch.
     
    Only cellular
    proliferation
     
    Intracystic
    (encapsulated)
    papillary ca.
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
    DCIS in
    papilloma
     
     
     
     
     
     
    FEHUT in
    papilloma
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
    >3 mm extent
     
    <3 mm extent
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
    DCIS in
    papilloma
     
    ADH in
    papilloma
     
     
     
     
     
     

    Notes:

    • Adapted from Mulligan & O'Malley.[8]
    • The most important decision is the first one: myoepithelial cells present vs. absent.
    • abnorm. arch. = abnormal architecture present.
    • DCIS = ductal carcinoma in situ.
    • FEHUT = florid epithelial hyperplasia of the usual type.
    • extent refers to the size of the abnormal cell population within the papillary lesion.

    Basaloid Lesions

    • Adenoid Cystic Carcinoma of the Breast
    • Intracystic Papillary Breast Carcinoma, Solid Variant
    • Medullary Breast Carcinoma
    • Medullary-like Breast Carcinoma

    Know when to start a discussion about BRCA mutations, triple negativity and the 'basal-like molecular phenotype'.

    Spindle Cell Lesions

    • Metaplastic Breast Carcinoma
    • Mammary Myofibroblastoma
    • Phyllodes Tumor - stromal component

    Malignant lesions

    Non-invasive breast cancer

    This includes the in situ lesions - DCIS and LCIS.

    Invasive breast cancer

    This is includes descriptions of the usual types... and the not so common ones.

    Common benign lesions

    The breast has lots of benign things. Unlike the prostate, the where benign is called benign, everything has a name. It is more common among breast pathologists to sign-out things like: apocrine metaplasia (benign), columnar cell change (benign), and florid epithelial hyperplasia of the usual type (FEHUT) - instead of - benign breast tissue.

    Mild epithelial hyperplasia

    General

    Microscopic

    Features:[9]

    • Breast glands with three or four cell layers above the basement membrane.
    • Variable cells.

    Note:

    • No nuclear atypia.

    DDx:

    Apocrine metaplasia

    General

    • Benign/not significant. Can be considered to be pretty wallpaper in the house of breast pathology.

    Etiology

    Microscopic

    Features:

    • Eosinophilic cytoplasm - key feature.

    Note:

    • Apocrine changes, i.e. cytoplasmic eosinophilia, can appear in malignant tumours; eosinophilia doesn't make something benign.
    • Apocrine snouts may be present. (???)
      • Small globules at the apical aspect of the cell (composed of cytoplasm and plasma membrane).

    Images

    Fibrocystic change

    • Abbreviated FCC.
    • AKA fibrocystic changes.

    General

    • Really common.
    • Benign.

    Microscopic

    Features:

    • Dilated glands - key change.
      • Glands normal: two cell layers present.
    • Often seen together with apocrine metaplasia.

    Images

    Columnar cell change

    • Abbreviated CCC.
    • AKA blunt duct adenosis.

    General

    • Columnar cell change is associated with (benign) calcification - key point.

    Microscopic

    Features:

    • Secretory cells (line gland lumen) have columnar morphology.
    • May have "apical snouts".
      • Blebs or round balls eosinophilic material appear to be adjacent to the cell at their luminal surface.
      • The snouts are attached to the cell-- appear as round ball only in the plane of section.
    • Cytoplasm +/-eosinophilia.

    DDx:

    Image:

    Gynecomastoid hyperplasia

    • AKA gynecomastia.

    Lesions with increased risk of malignancy

    Florid epithelial hyperplasia

    • AKA florid epithelial hyperplasia, abbreviated FEH.
    • AKA florid epithelial hyperplasia of the usual type, abbreviated FEHUT.
    • AKA epithelial hyperplasia - term should be avoid as it could lead to confusion with mild epithelial hyperplasia.

    General

    Note:

    • Moderate epithelial hyperplasia redirects to this section.
      • It is generally not separated from FEH, as the prognosis is thought to be the same.

    Microscopic

    Features:[11]

    • Breast glands with more than four cell layers above the basement membrane - key feature.
    • Irregular cell spacing; streaming.
    • Slit-like lumina, esp. at the periphery of the duct.
    • No DCIS-like architecture (not cribriform, not papillary, not micropapillary, not solid).
    • No nuclear atypia - usually no nucleoli.

    Memory device CLEAN:

    • Cell spacing is irregular, Lumina are slit-like, Extent is less than 2 mm or 2 ducts, Architecture not DCIS-like, Nuclear atypia not present.

    DDx:

    Sclerosing adenosis

    General

    • Can be scary... can look like ductal carcinoma.
    • Derived from sclerosing[12] (hardening) and adenosis (glandular enlargement).
      • Think scaring + lotsa glands and you're pretty close.
    • Management: follow-up, no further treatment.[13]

    Microscopic

    Features:

    • Acini are smaller than usual and there are more of them.
      • Acini often slit-like.
    • Fibrosis (scleroses) - pink on H&E surrounds the acini.

    Notes:

    • The acini should:
      • Be in lobular arrangements, i.e. in groups (benign appearance at low power) - key feature.
      • Have two cell layers like well-behaved breast glands do.

    DDx:

    Flat epithelial atypia

    General

    Epidemiology:

    • Associated with ADH & DCIS; may represent a non-obligate precursor lesion of ADH & DCIS.[15]
    • Low risk of progression to invasive malignancy.[16]

    Management:

    • Excision.

    Microscopic

    Features:

    • "Flat" ~ three cells thick.
    • Hypercellular gland -- several layers.
    • Columnar cell morphology.
    • +/-Apical snouts.

    DDx:

    Molecular

    Complex sclerosing lesion

    • AKA radial scar.

    General

    • The term radial scar is a misnomer. It isn't a scar. It isn't associated with prior trauma or surgery.[17]
    • May appear malignant on imaging.[18]
    • Associated with subsequent elevated risk of breast cancer.[19]
    • Management - usu. surgical excision.[20]

    Gross

    • Spiculated mass.
    • Usually small - 3-7 mm.

    Image

    Microscopic

    Features:[20][21]

    • Stellate appearance (low magnification).
    • Center of lesion has "fibroelastosis" - stroma light pink (on H&E) - key feature.
      • Scar like stroma with entrapped normal breast ducts and lobules.
      • Glands appear to enlarge with distance from center of lesion.

    Notes:

    • Histomorphologic appearance may mimic a desmoplastic reaction of the stroma - leading to a misdiagnosis of malignancy.
    • "Hyaline - pink stuff on H&E - is the key."

    DDx:

    Images

    IHC

    Features:

    • p63 +ve.
    • Calponin +ve.

    Note:

    • HMWK +ve/-ve. (???)

    Stromal lesions

    This section (below) covers stromal lesions of the breast, which vary from benign to malignant. The most common is (the benign) fibroadenoma.

    Non-breast stroma stromal lesions are covered in the soft tissue lesions article. Angiosarcoma (dealt with in the vascular tumours article) is the most common (non-breast stroma) sarcoma of the breast, and classically arises after treatment for a breast carcinoma.

    Fibroadenoma

    Phyllodes tumour

    • Previously cystosarcoma phyllodes.

    Pseudoangiomatous stromal hyperplasia

    • Abbreviated PASH.
    • AKA nodular myofibroblastic stromal hyperplasia of the mammary gland.[22]

    Weird stuff

    Like in all niches of pathology... there is weird stuff.

    Mammary hamartoma

    • AKA breast hamartoma.

    Collagenous spherulosis

    Nipple adenoma

    • AKA nipple duct adenoma.
    • AKA nipple adenoma of breast.
    • AKA adenoma of the nipple.
    • AKA florid papillomatosis of the nipple.[24]

    Intraductal papilloma

    Lymphocytic mastitis

    Microglandular adenosis

    Not to be confused with microglandular hyperplasia.
    • Abbreviated MGA.

    Adenomyoepithelioma

    Mammary myofibroblastoma

    • AKA breast myofibroblastoma.
    • AKA myofibroblastoma of the breast.

    Squamous metaplasia of lactiferous ducts

    • Abbreviated SMOLD.

    Granular cell tumour of the breast

    General

    • Uncommon.

    Gross

    • May be a spiculated mass and thus mimic malignancy radiologically.[25]

    Microscopic

    See granular cell tumour.

    DDx:

    See also

    References

    1. URL: http://breastcancer.about.com/od/diagnosis/a/birads.htm. Accessed on: 16 March 2011.
    2. MUA. 1 October 2010.
    3. MUA. 1 October 2010.
    4. RS. 4 May 2010.
    5. URL: [Breast_pathology#Lactational_changes Breast_pathology#Lactational_changes. Accessed on: 3 October 2011.
    6. Tavassoli, FA.; Yeh, IT. (Jan 1987). "Lactational and clear cell changes of the breast in nonlactating, nonpregnant women.". Am J Clin Pathol 87 (1): 23-9. PMID 2879437.
    7. URL: http://flylib.com/books/en/2.953.1.9/1/. Accessed on: 6 August 2011.
    8. Mulligan AM, O'Malley FP (March 2007). "Papillary lesions of the breast: a review". Adv Anat Pathol 14 (2): 108–19. doi:10.1097/PAP.0b013e318032508d. PMID 17471117.
    9. O'Malley, Frances P.; Pinder, Sarah E. (2006). Breast Pathology: A Volume in Foundations in Diagnostic Pathology series (1st ed.). Churchill Livingstone. pp. 159-160. ISBN 978-0443066801.
    10. Mitchell, Richard; Kumar, Vinay; Fausto, Nelson; Abbas, Abul K.; Aster, Jon (2011). Pocket Companion to Robbins & Cotran Pathologic Basis of Disease (8th ed.). Elsevier Saunders. pp. 542. ISBN 978-1416054542.
    11. O'Malley, Frances P.; Pinder, Sarah E. (2006). Breast Pathology: A Volume in Foundations in Diagnostic Pathology series (1st ed.). Churchill Livingstone. pp. 159-160. ISBN 978-0443066801.
    12. URL: http://dictionary.reference.com/browse/sclerosis. Accessed on: 16 March 2011.
    13. URL: http://www.breastcancercare.org.uk/breast-cancer-information/breast-awareness/benign-breast-conditions/sclerosing-lesions. Accessed on: 30 April 2012.
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    15. Lerwill, MF. (Apr 2008). "Flat epithelial atypia of the breast.". Arch Pathol Lab Med 132 (4): 615-21. doi:10.1043/1543-2165(2008)132[615:FEAOTB]2.0.CO;2. PMID 18384213.
    16. Schnitt, SJ. (2003). "The diagnosis and management of pre-invasive breast disease: flat epithelial atypia--classification, pathologic features and clinical significance.". Breast Cancer Res 5 (5): 263-8. doi:10.1186/bcr625. PMID 12927037.
    17. Kumar, Vinay; Abbas, Abul K.; Fausto, Nelson; Aster, Jon (2009). Robbins and Cotran pathologic basis of disease (8th ed.). Elsevier Saunders. pp. 1072. ISBN 978-1416031215.
    18. Ung OA, Lee WB, Greenberg ML, Bilous M (January 2001). "Complex sclerosing lesion: the lesion is complex, the management is straightforward". ANZ J Surg 71 (1): 35–40. PMID 11167596.
    19. URL: http://www.cancer.org/docroot/NWS/content/NWS_1_1x_Radial_Scars.asp. Accessed on: 4 May 2010.
    20. 20.0 20.1 Kennedy M, Masterson AV, Kerin M, Flanagan F (October 2003). "Pathology and clinical relevance of radial scars: a review". J. Clin. Pathol. 56 (10): 721–4. PMC 1770086. PMID 14514771. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1770086/.
    21. O'Malley, Frances P.; Pinder, Sarah E. (2006). Breast Pathology: A Volume in Foundations in Diagnostic Pathology series (1st ed.). Churchill Livingstone. pp. 91. ISBN 978-0443066801.
    22. Leon, ME.; Leon, MA.; Ahuja, J.; Garcia, FU.. "Nodular myofibroblastic stromal hyperplasia of the mammary gland as an accurate name for pseudoangiomatous stromal hyperplasia of the mammary gland.". Breast J 8 (5): 290-3. PMID 12199757.
    23. URL: http://surgpathcriteria.stanford.edu/breast/collspher/. Accessed on: 4 September 2011.
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