Published on: • By: Imaging Uganda/Africa

Ultrasound Case: Lactational Breast Abscess

Clinical History

A 27-year-old lactating female presented to the imaging department with a painful swelling in her left breast. The patient reported severe localized tenderness, redness, and an associated high-grade fever. On physical examination, the left breast was erythematous and warm to the touch. Clinical examination revealed a palpable, fluctuant mass within the symptomatic area, raising high suspicion for an underlying fluid collection.

Ultrasound Findings

Ultrasound examination of the left breast using a high-frequency linear transducer demonstrated:

  • A hypoechoic to complex cystic lesion with irregular margins, measuring approximately 1.91 cm × 2.05 cm × 1.33 cm.
  • Low-level internal echoes and layering debris within the collection, highly suggestive of thick pus.
  • Marked posterior acoustic enhancement, confirming the fluid-filled nature of the mass.
  • Prominent peripheral hyperemia visible on color Doppler imaging, with no significant internal vascularity.
  • Extensive surrounding parenchymal edema and reactive inflammatory changes.
  • No suspicious solid components or discrete mural nodules were identified.
  • Evaluation of the axilla revealed reactive but non-pathologic lymph nodes.
Gray-scale ultrasound scan of the left breast showing a complex cystic lesion with irregular margins and low-level internal echoes.
1. Left Breast Collection: Complex hypoechoic cystic lesion with irregular margins and internal debris, consistent with pus.
Ultrasound image showing the multi-planar measurements of the breast abscess and prominent posterior acoustic enhancement.
2. Lesion Measurements: The complex fluid collection measures approximately 1.91 cm × 2.05 cm × 1.33 cm, displaying posterior acoustic enhancement.
Color Doppler ultrasound demonstrating significant peripheral vascularity surrounding the hypoechoic breast abscess.
3. Color Doppler Imaging: Demonstration of peripheral hyperemia and increased blood flow in the surrounding inflamed tissue, without internal vascularity.
Grayscale ultrasound of the left axilla demonstrating a reactive lymph node with concentric cortical thickening but a preserved fatty hilum.
4. Left Axillary Lymphadenopathy: Grayscale ultrasound of the left axilla shows an enlarged, reactive lymph node with mild cortical thickening, secondary to the breast infection.

Diagnosis

The clinical presentation and sonographic findings were highly consistent with a lactational breast abscess.

Discussion

Breast abscesses most commonly arise as a complication of untreated or inadequately managed mastitis. They are predominantly bacterial in origin, with Staphylococcus aureus being the most frequently isolated pathogen. In lactating women, milk stasis, cracked nipples, and localized nipple trauma serve as primary entry points and predisposing factors for bacterial proliferation.

Targeted high-resolution ultrasound is the modality of choice for evaluation, classically demonstrating a complex fluid collection with irregular or thick walls, low-level internal echoes, posterior acoustic enhancement, and surrounding tissue hypervascularity. Ultrasound is also invaluable for distinguishing a true abscess from inflammatory phlegmon, and for guiding therapeutic interventions.

Differential Diagnosis

While the constellation of systemic symptoms and localized fluctuance points strongly toward an abscess, other considerations include:

  • Galactocele: A milk-retention cyst that is typically well-circumscribed and lacks internal color Doppler flow, peripheral hyperemia, or acute systemic inflammatory changes.
  • Inflammatory Breast Carcinoma: A rare but critical malignancy to exclude. It mimics mastitis clinically due to skin thickening (peau d’orange) and erythema, but lacks a simple or complex fluctuant fluid collection and does not resolve with standard antimicrobial therapies.

Management

The established management plan for this patient includes:

  • Antibiotic Therapy: Empiric or culture-guided systemic antibiotics targeting common cutaneous pathogens like Staphylococcus aureus.
  • Interventional Drainage: Ultrasound-guided needle aspiration or percutaneous catheter drainage, which is less invasive and widely preferred over traditional surgical incision and drainage.
  • Continued Lactation: Regular breastfeeding or mechanical milk expression from the affected breast is actively encouraged to prevent ongoing milk stasis and promote resolution.

Follow-up imaging is recommended to ensure complete clinical and sonographic resolution of the collection.

Technical Spotlight: Mindray DC-30 Full HD

The clinical images featured in this case study were captured using the Mindray DC-30 Full HD Ultrasound System.

As demonstrated in this case, the DC-30 delivers exceptional clarity and performance for superficial and small-parts scanning, making it a reliable workhorse for everyday diagnostic imaging.

  • Full HD Clarity: High-resolution imaging that brings out subtle structural details, crucial for evaluating complex fluid collections, debris, and tissue margins.
  • Advanced Color Doppler: Sensitive blood flow detection to easily assess peripheral hyperemia and tissue vascularity.
  • Optimized Workflow: Designed with an intuitive interface to reduce scan time and improve diagnostic throughput.

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