case_images: PMC11324205_01
case_images: Mammography and ultrasound findings. a Mammography showed an oval well-demarcated mass (arrow). b Ultrasound showed an oval mass with indistinct boarders (arrows), internal iso-echoes with high echo spots, and unchanged posterior echoes.
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case_images: PMC11324205_01_cro-2024-0017-0001-539644_F01.jpg
case_images: F1
case_images: Mammography showed a circumscribed oval mass, 10 mm in size (Fig. 1a). Ultrasonography showed an oval mass with indistinct borders, internal iso-echoes with high echo spots, and unchanged posterior echoes (Fig. 1b).
case_images: Magnetic resonance imaging (MRI) findings. MRI showed a hypo-intense pattern both on T1- (a: arrow) and T2-weighted (b: arrow) images. Time-signal intensity images showed long-lasting rim enhancement (c: early phase, d: late phase).
case_images: cro-2024-0017-0001-539644_F02.jpg
case_images: PMC11324205_01_cro-2024-0017-0001-539644_F02.jpg
case_images: F2
case_images: T1- (Fig. 2a) and T2-weighted (Fig. 2b) images and a long-lasting rim enhancement pattern up to the late phase on time-signal intensity images (Fig. 2c, d). The small size and obscureness of the mass borders on ultrasound probably caused inappropriate tissue sampling of the lesion with core needle biopsy, leading to no definitive diagnosis of the mass.
case_images: Pathological findings. a The bisected tumor showed an oval and flesh-colored well-demarcated mass (arrowheads) with multiple whitish spots (arrows). b Low magnified view showed the tumor composed of multiple glands. c Magnified view showed eosinophilic luminal apocrine cell layers (arrows) and outer basal myoepithelium cell layers (arrowheads). d Magnified view showed aggregated foamy histiocytes in some glandular lumens (asterisks).
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case_images: PMC11324205_01_cro-2024-0017-0001-539644_F03.jpg
case_images: F3
case_images: Cut surface of the mass was flesh-colored and had multiple white spots (Fig. 3a). Pathological study showed dense predominantly oval glandular ducts with luminal apocrine cell layers, outer myoepithelium cell layers, and slight fibrosis (Fig. 3b, c). Glandular cavities on pathology well matched to white spots observed on macroscopic view, seemed vacant in a cyst-like fashion, and had aggregated foamy histiocytes in some of them (Fig. 3d).