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Fig. 7 | Insights into Imaging

Fig. 7

From: Ultrasound imaging of the axilla

Fig. 7

Pseudofolliculitis cutis of the axilla. Avoiding an excessive squeeze of the superficial soft tissues, also a small hypoechoic “mass” (yellow arrowheads) can be easily identified within the dermal layer of the axilla (A). Of note, a gentle sono-palpation (B) can be performed to promptly confirm the solid texture of inflammatory tissues (white dotted line) wrapping the hyperechoic “ingrown” hairs (white arrowhead). C–D The histological examination (C) confirms the simultaneous presence of an acute inflammatory infiltrate (1) with neutrophilic and eosinophilic granulocytes reacting against the epithelium of the follicular structure (black arrowheads)—external and internal root sheath—and a chronic inflammatory infiltrate (2) with lymphocytes, plasma cells and macrophages reacting against broken hair shafts and generating foreign body giant cell reaction in the peri-follicular area. Of note, inflammatory cells (3) are also leading to a progressive disruption of the follicular papilla (FP) (D). H&E: hematoxylin & eosin

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