Clinical and magnetic resonance imaging (MRI) photographs of patients 1 (A and C) and 2 (B and D). A and B, Ulcerations in the left buttocks measured 45 × 45 mm with a 50-mm-deep pocket and 30 × 20 mm with a 50-mm-deep pocket, respectively. C and D, Contrast-enhanced T1-weighted MRI shows ringlike enhancement of the cavity wall (arrows); the arrowheads indicate ischial tuberosity.
Hematoxylin-eosin staining of surgical pathologic specimens from patients 1 (A and C) and 2 (B and D). A and B, Cyst walls consisting of fibrous connective tissues, numerous blood vessels, and chronic inflammatory cells (original magnification ×40). C and D, Walls of the cysts have fingerlike projections; the linings of the cysts are composed of a few layers of synovium; and walls of the vessels in the cyst wall are thickened (original magnification ×200).
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