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Giant fibroadenomas are fibroadenomas weighing more than 500 grams or measuring >5 cm in size 2.
Please refer to the fibroadenoma article for further details.
They are usually encountered in pregnant or lactating women.
The typical presentation is in a woman with a large palpable breast lump.
Microscopically, comprises both stromal and epithelial cells.
Radiographic features are the same as for normal fibroadenomas.
Variable features from the well-circumscribed discrete oval mass hypo- or isodense to breast glandular tissue, to a mass with macrolobulation or partially obscured margin. Involuting lesions can produce classic, coarse popcorn calcification appearance.
Well-circumscribed, round and/or macrolobulated mass with homogeneous hypoechogenicity.
- T1: mostly hypointense or isointense
- T2: variable intensity
- T1 C+ (Gd): variable
Treatment and prognosis
Although benign, giant fibroadenomas should be excised because of their similar clinicoradiological presentation to the malignant phyllodes tumor.
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