Tiger-Striped PASH: Recognition of a Unique Morphology Allows for a Zippered-Up Diagnosis of Pseudoangiomatous Stromal Hyperplasia of Breast

Figure 2

Low-power histologic assessment shows scattered nonneoplastic breast epithelial elements including scattered ducts and the edge of a terminal duct lobular unit with stromal expansion between and within these epithelial structures. Eosinophilic expanses of fibrous tissue are noted with linear arrangements of spindle cell nuclei resulting in a tiger-stripe-like pattern ((a) hematoxylin and eosin, 100X). At intermediate magnification, the nuclear arrangements with offset eosinophilic cytoplasmic bands emphasize the striped morphology ((b) hematoxylin and eosin, 200X).

(a)

(b)