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Case number:	029
Age:	44
Clinical presentation:	Premenopausal woman with average risk of developing breast cancer presented with a left breast lump following breast trauma a week ago.

Ultrasound:

Ultrasound features: Left breast, inner quadrants at 9 o’clock
‣ Mass
• Location:	Left breast, inner quadrants at 9 o’clock
• Number:	1
• Size:	2.5 × 0.7 cm
• Shape:	Irregular
• Orientation:	Parallel
• Margins:	Indistinct
• Echo pattern:	Anechoic
• Posterior features:	No posterior features
‣ Calcifications:	None
‣ Associated features:	None
‣ Special cases:	Post-traumatic organized haematoma collection

BI-RADS:

BI-RADS Category: 2 (benign)

Further assessment:

Further assessment advised: Referral for cytology

Cytology:

Cytology features:
‣ Type of sample:	FNAC
‣ Site of biopsy:
• Laterality:	Left
• Quadrant:	Inner, 9 o’clock
• Localization technique:	Palpation
• Nature of aspirate:	Greasy aspirate
‣ Cytological description:	Abundant lipid debris with many degenerating adipocytes, foamy macrophages, and a few inflammatory cells
‣ Reporting category:	Benign
‣ Diagnosis:	Cytomorphology suggestive of fat necrosis
‣ Comments:	None

Case summary:

Premenopausal woman presented with left breast lump following recent breast trauma. Diagnosed as post-traumatic collection on imaging and as fat necrosis on cytology.

Learning points:

Fat necrosis can simulate carcinoma clinically because of skin retraction and also on imaging studies where it is seen as a mass with irregular margins.