Mastitis differential diagnosis

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Prince Tano Djan, BSc, MBChB [2] Shadan Mehraban, M.D.[3]

Overview

Mastitis must be differentiated from other diseases that cause breast pain and/or swelling, such as galactocele^[1]^[2], breast engorgement^[3]^[4] ^[5], mastodynia^[6]^[7]^[8], fibrocystic breast disease, breast cancer, fibroadenoma, mondor's disease^[9]^[10] and breast abscess.

Differentiating Mastitis from other diseases

Mastitis must be differentiated from other diseases that cause breast pain and swelling as shown below:^[11]^[12] ^[13]^[14]^[15]^[16]^[17]^[10]^[18]^[19]

Diseases	Laboratory Findings		Physical Examination			History and Symptoms								Other Findings
Diseases	Culture of the discharge	Biopsy	Breast tenderness	Skin induration	Cordlike vein appearance	History of trauma	Nipple retraction	Nipple discharge	Erythema	Fever	Warmth	Lymphadenopathy	Itching	Other Findings
Breast abscess	+	-	+	+	-	+	-	+	+	+	+	-	-
Mastitis	+	-	+		-	+	-	+	+	+	+	+	-
Inflammatory breast cancer	-	+	+	+		-	+	-	+	-	+	+	+	Peau d' orange appearance of the skin Metastasis is common.
Galactocele	-	-	-	-		-	-	+	-	-	-	-	-	It is differentiated from other masses by US.
Mondor's syndrome			+	+	+	-								Retracted breast skin and elevation of the skin may be observed.
Cellulitis	-		+	+					+	-	+	+	-
Fibroadenoma	-	+	-	-		-		-	+					Peau d' orange skin apperance. Enlarged veins on the skin

Other differential diagnosis of mastitis may include:

Differentiation of different types of breast lumps:

ABBREVIATIONS
LAP=Lymphadenopathy, HRT=Hormonal replacement therapy, FNA=Fine needle aspiration, DCIS=Ductal carcinoma in-situ

Diseases	Benign or Malignant	Clinical manifestation								Paraclinical findings		Gold standard diagnosis
		Demography	History	Symptoms			Signs			Histopathology	Imaging
		Demography	History	Mass	Mastalgia	Nipple discharge	Breast exam	Skin changes	LAP	Histopathology	Imaging
Fibroadenoma^[20]	Benign Very slight increased risk of breast cancer in complex fibroadenoma	Most common benign tumor, women aged 20-30 years	Increases in size during pregnancy or with estrogen therapy, and regress after menopause	+	±	–	Solitary Well-defined Mobile mass	–	–	Proliferative breast lesion without atypia	Ultrasound: Well-defined Solid mass	Mammography Ultrasound Biopsy
Breast cyst^[21]	Benign No increased risk of malignancy for simple cyst <1% for complicated cyst <1% to 23% for complex cyst	Common masses found in premenopausal, perimenopausal, and postmenopausal women Mostly seen among HRT users	May resolve after aspiration Further evaluation for unresolved masses	+	±	–	Solitary Cluster of small masses or an ill-defined mass Smooth, firm, and frequently tender	–	–	Nonproliferative breast lesions	Ultrasound: Simple cyst: Well circumscribed, posterior acoustic enhancement without internal echoes Complicated cyst: Homogenous low-level internal echoes due to without solid components Complex cyst: Thick walls greater than 0.5 mm with solid component	Ultrasound Fine needle aspiration (FNA)
Fibrocystic change^[22]	Benign No increased risk of malignancy Slightly increased risk of malignancy in presence of positive familial history of breast cancer	Unknown prevalence among adolescents >50% in women of reproductive age	Present before menses and improve during menstruation	+	+	±	Painful breast tissue Tender, nodular swelling	–	–	Nonproliferative breast lesions	Ultrasound: Small cysts in mammary zone Fibroglandular tissue around the mass	Ultrasound Mammography (it is not recommended for adolescents)
Galactocele^[23]^[24]	Benign No increased risk of malignancy	Milk retention cysts with fluid collection among pregnant women and during breast-feeding	After ending lactation, the cysts resolve	+	±	±	Soft masses Cystic masses	–	–	Inflammation of lactate ducts due to extension, results in wall fibrosis	Mammography: Intermediate mass in absence of classic fat-fluid level Ultrasound: Complex mass	Ultrasound Mammography
Cysts of montgomery^[25]	Benign No increased risk of malignancy	Most common in age of 10-20 years old	More than 80% resolve spontaneously Drainage is essential in rare cases	+	±	±	Asymptomatic subareolar mass Drainage of clear to brownish fluid	±	–	Acute inflammation due to obstruction of the Montgomery's gland	Ultrasound: Single cystic lesion in retroareolar area	Ultrasound
Hamartoma^[26]	Benign Coexisting malignancy may be present	Common in women older than 35 years old	Asymptomatic ones found incidentally or painless breast lump Usually excised	±	–	–	Soft breast lump Breast enlargement without palpable mass	±	–	Benign proliferation of fibrous, glandular, and fatty tissue Thin capsule of connective tissue	Mammography: Well-described Discrete, solid, and encapsulated lesion	Ultrasound Mammography
Breast abscess^[27]^[28]	Benign No increased risk of malignancy	Complication of lactational mastitis in 14% of cases Common among African-American women, heavy smokers , and obese patients	Resolve after drainage/antibiotic therapy	+	+	–	Localized inflammation of breast Tenderness	+	–	Mixed inflammatory feature by neutrophils. Granulation tissue and chronic inflammation feature caused by Gram-positive cocci	Ultrasound: Fluid collection	Ultrasound
Mastitis^[29]^[30]	Benign No increased risk of malignancy	Common among lactating women (first three months of breast-feeding) Periductal mastitis among smokers and associated with squamous metaplasia	Resolve after drainage/antibiotic therapy	±	+	±	Breast tenderness Swollen breast tissue	+	–	Breast parenchyma inflammation: Acute mastitis: Staphylococcus infection Granulomatous mastitis: Tuberculosis or sarcoidosis infection	Ultrasound: Ill-defined area with hyperechogenicity with inflamed fat lobules Skin thickening	Ultrasound
Diseases	Benign or Malignant	Demography	History	Mass	Mastalgia	Nipple discharge	Breast exam	Skin changes	LAP	Histopathology	Imaging	Gold standard diagnosis
Breast carcinoma^[31]^[32]^[33]	Malignant	Most common diagnosed cancer among women Leading cause of cancer death in women 40-49 years old	Positive family history	+	–	±	Hard Immobile Solitary Irregular margin	±	±	Molecular alteration in epithelial cells Ductal Lobular Ductal/lobular Mucinous Tubular Medullary Papillary	Mammography: Spiculated soft tissue, mass microcalcification Ultrasound: Spiculated, hypoechoic lesion, shadowing, internal calcification	Ultrasound Mammography
Ductal carcinoma in situ (DCIS)^[34]^[35]	Malignant	Approximately 25% of all breast cancers Increase risk with ageing	Positive family history Nulliparity Obesity	±	–	±	May have normal physical exam	–	–	Noninvasive breast cancer Heterogenous group of neoplastic lesions	Mammography: Suspicious microcalcification	Mammography
Microinvasive breast cancer^[36]	Malignant	Rare Commonly referred to DCIS with microinvasion Average age 50-60 years old	Nulliparity Positive family history	+	–	±	Solitary Firm palpable mass	–	±	Associated with high grade DCIS	Mammography: A mass with or without calcification Stromal reaction	Mammography
Breast sarcoma^[37]	Malignant	Rare type, < 1% of all breast malignancies Average age of between 45-50 years	Positive history of breast cancer Rapid increase in size	+	–	–	Well-defined Firm mass	±	–	Heterogeneous nonepithelial malignancies from connective tissue of breast	Mammography: Noncalcified oval mass Indistinct margins	Mammography
Phyllodes tumor^[38]^[39]	Benign or Malignant	Most common in premenopausal women (40-50 years)	Represent 1% of breast tumors Grow aggressively Classify in benign, borderline, and malignant groups	±	–	–	Smooth and multinodular Well-defined Firm mass Mobile	–	–	Nonepithelial breast neoplasm with average size of 5 cm	Ultrasound: Solid mass Hypoechoic Well-circumscribed Mammography: Smooth mass Polylobulated mass	Ultrasound Mammography
Lymphoma^[40]^[41]	Malignant	Extremely rare ( 0.04%-0.5%) Average age 55-60 years	Unilateral mass in older women In childbearing women, bilateral and similar to inflammatory breast cancer, possibly having Burkitt lymphoma	+	–	–	Well-defined, firm mass Multiple	–	±	Diffuse growth pattern with large cells like immunoblast associated with neutrophils	Mammography: Nonspecific circumscribed masses Without calcification	Mammography Core biopsy
Duct ectasia^[42]	Benign	Common among perimenopausal women	Usually resolve spontaneously	±	±	±	Usually asymptomatic	–	–	Distention of subareolar ducts	Ultrasound: Dilated milk ducts Fluid-filled ducts	Ultrasound
Intraductal papilloma^[43]	Benign	Common in women between 35-55 years old	Possibly benign Harbor areas of atypia or DCIS Surgical excision is recommended	+	±	±	Solitary or multiple lesion Large lump near nipple	–	–	Growth of papillary cell into a lumen	Ultrasound: Well-defined Solid nodule	Core needle biopsy
Lipoma^[44]	Benign	Common between age of 40-60 years old	Benign tumors May experience recurrence	+	–	–	Solitary Mobile Soft mass	–	–	Mature adipocytes without lipoblasts or atypia	Ultrasound: Well-Circumscribed Hypoechoic lesion	Core needle biopsy Excisional biopsy
Sclerosing adenosis^[45]^[46]	Small risk of malignancy	Recurrent pain during mensturation	May present as a mass or incidental finding on mammogram No treatment is needed	±	+	–	Multiple lesion Firm Tender nodules	±	–	Proliferative disease	Mammography: Well-defined or irregular mass Microcalcification	Mammography
Pseudoangiomatous stromal hyperplasia^[47]^[48]	Benign	Common in reproductive age women	Benign stromal proliferation Stimulation of vascular lesion	+	–	–	Solitary firm mass Thickening	–	–	Slit-like spaces between glandular units Maybe confused with mammary angiosarcoma	Mammography and ultrasound: Well-defined Solid mass Noncalcified	Ultrasound Mammography
Mondor's disease^[49]^[50]	Benign	Uncommon benign disease Occur on outer side of breast or under nipple	Benign and self-limiting disease Resolve after 4-6 weeks	+	+	–	Thick and tender cord on breast skin	+	–	N/A	Ultrasound: Tubular anechoic structure Multiple narrowing areas	Clinical examination Ultrasound
Diseases	Benign or Malignant	Demography	History	Mass	Mastalgia	Nipple discharge	Breast exam	Skin changes	LAP	Histopathology	Imaging	Gold standard diagnosis
Diabetic mastopathy^[51]	Benign	Lymphocytic mastitis or mastopathy Common among premenopausal women Longstanding diabetes mellitus type 1	Suspicious breast mass After diagnosis, excision is not required	+	–	–	Ill-defined mass Immobile	–	–	Dense keloid-like fibrosis Periductal, lobular, and perivascular lymphocytic infiltration	Ultrasound: Irregular mass Hypoechoic Dense lesion	Ultrasound Core needle biopsy
Gynecomastia^[52]^[53]	Benign	Benign breast tissue swelling among men and boys around puberty	Benign proliferation of the male breast glandular tissue Usually underlying nipple mass At least 0.5 cm	+	±	±	Unilateral or bilateral firm mass Breast swelling Rubbery mass	–	–	Glandular breast changes	Ultrasound: Nodular pattern Dendritic pattern Diffuse glandular pattern	Ultrasound
Sarcoidosis^[54]	Benign	Rare in patients with systemic involvement	Benign palpable mass May mimic malignancy feature	+	–	–	Firm mass Hard mass	–	–	Epithelioid granulomas with multinucleated giant cell with rare necrosis	Mammography: Irregular Ill-defined Spiculated solid mass	Biopsy
Fat necrosis^[55]	Benign	Common among women May mimic malignancy features	Benign breast lumps develop after trauma/ surgery Suspicious lumps required biopsy No excision in established diagnosis	+	±	–	Hard or smooth mass Solitary mass Mobile	–	–	Collections of liquefied fat	Ultrasound: Collections of liquefied fat Oil cysts	Ultrasound

References

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↑ Canlorbe G, Bendifallah S (2015). "[Rare benign breast tumors including Abrikossoff tumor (granular cell tumor), erosive adenomatosis of the nipple, cytosteatonecrosis, fibromatosis (desmoid tumor), galactocele, hamartoma, hemangioma, lipoma, juvenile papillomatosis, pseudoangiomatous hyperplasia, and syringomatous adenoma: Guidelines for clinical practice]". J Gynecol Obstet Biol Reprod (Paris). 44 (10): 1030–48. doi:10.1016/j.jgyn.2015.09.034. PMID 26530177.
↑ Pustotina O (2016). "Management of mastitis and breast engorgement in breastfeeding women". J Matern Fetal Neonatal Med. 29 (19): 3121–5. doi:10.3109/14767058.2015.1114092. PMID 26513602.
↑ Leung SS (2016). "Breast pain in lactating mothers". Hong Kong Med J. doi:10.12809/hkmj154762. PMID 27313273.
↑ Anderson L, Kynoch K (2016). "Implementation of an education package on breast engorgement aimed at lactation consultants and midwives to prevent conflicting information for postnatal mothers". Int J Evid Based Healthc. doi:10.1097/XEB.0000000000000090. PMID 27465926.
↑ van Bogaert LJ (1986). "[Mastodynia and fibrocystic disease of the breast. Perspectives and methods of medical treatment]". J Gynecol Obstet Biol Reprod (Paris). 15 (6): 805–11. PMID 3794218.
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Template:WS Template:WH

[pmid26341843-1] Langer A, Mohallem M, Berment H, Ferreira F, Gog A, Khalifa D; et al. (2015). "Breast lumps in pregnant women". Diagn Interv Imaging. 96 (10): 1077–87. doi:10.1016/j.diii.2015.07.005. PMID 26341843.

[pmid26530177-2] Canlorbe G, Bendifallah S (2015). "[Rare benign breast tumors including Abrikossoff tumor (granular cell tumor), erosive adenomatosis of the nipple, cytosteatonecrosis, fibromatosis (desmoid tumor), galactocele, hamartoma, hemangioma, lipoma, juvenile papillomatosis, pseudoangiomatous hyperplasia, and syringomatous adenoma: Guidelines for clinical practice]". J Gynecol Obstet Biol Reprod (Paris). 44 (10): 1030–48. doi:10.1016/j.jgyn.2015.09.034. PMID 26530177.

[pmid26513602-3] Pustotina O (2016). "Management of mastitis and breast engorgement in breastfeeding women". J Matern Fetal Neonatal Med. 29 (19): 3121–5. doi:10.3109/14767058.2015.1114092. PMID 26513602.

[pmid27313273-4] Leung SS (2016). "Breast pain in lactating mothers". Hong Kong Med J. doi:10.12809/hkmj154762. PMID 27313273.

[pmid27465926-5] Anderson L, Kynoch K (2016). "Implementation of an education package on breast engorgement aimed at lactation consultants and midwives to prevent conflicting information for postnatal mothers". Int J Evid Based Healthc. doi:10.1097/XEB.0000000000000090. PMID 27465926.

[pmid3794218-6] van Bogaert LJ (1986). "[Mastodynia and fibrocystic disease of the breast. Perspectives and methods of medical treatment]". J Gynecol Obstet Biol Reprod (Paris). 15 (6): 805–11. PMID 3794218.

[pmid26817204-7] Songtish D, Akranurakkul P (2015). "Mastalgia: Characteristics and Associated Factors in Thai Women". J Med Assoc Thai. 98 Suppl 9: S9–15. PMID 26817204.

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Mastitis differential diagnosis

Overview

Differentiating Mastitis from other diseases

References

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