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. 2023 Feb 15;48(4):1479–1504. doi: 10.1007/s00261-023-03830-3

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Fig. 21 — 30-year-old male with Hidradenitis Suppurativa (HS). Axial (a, b) and coronal (c) CT reformats through the gluteal cleft and perineum demonstrate nodular, bilateral, fairly symmetrical subcutaneous soft tissue thickening (arrows) with sinus track formation (arrowhead) in a patient with pathologically proven HS. Contrast these findings with a different patient with cellulitis. Axial (d) CT image illustrates diffuse “fat stranding” in the left greater than right gluteal subcutaneous soft tissues (curved arrows), compatible with cellulitis. A developing fluid collection is noted in the right gluteal subcutaneous tissues