PMC5575440_01
Abdominal enhanced computed tomography. (A) Axial image showed a 50-mm nonenhanced mass with a central calcification. (B) Sagittal image showed the mass adjacent to the rectum in the pelvic cavity.
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Computed tomography (CT) showed an oval-shaped lesion measuring 58 mm in diameter, with calcification of the luminal core (Fig. 1A, B).
Magnetic resonance imaging findings. (A), (B) Both T1- and T2-weighted images showed a low-intensity mass with the same degree of intensity as muscle tissue.
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The lesion showed low intensity in T1-/T2-weighted images (Fig. 2A, B).
(A) Laparoscopic surgery revealed an oval-shaped peritoneal loose body lying completely free in the pelvic cavity. (B) The loose body was placed in an endoscopic retriever bag and extracted from an enlarged port site.
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On exploration, a yellow-white, oval-shaped mass was discovered in the pelvic cavity, between the rectum and the urinary bladder (Fig. 3A). It was completely separated from the intraperitoneal organs, and resembled a "boiled egg." With the confirmed diagnosis of a giant PLB, the mass was placed into an endoscopic retriever bag (Fig. 3B) and taken out through the enlarged trocar site in the navel.
Extracted specimen. (A) The peritoneal loose body, measured 65 mm, was white and oval-shaped, and had a bony-hard and slightly glossy surface. (B) Histological examination revealed a necrotic fatty lesion in the central position, surrounded by layers of collagenous fibers.
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The cut surface of the mass showed a bony-hard and smooth surface; with central calcareous deposition, the cut surface had the appearance of a typical boiled hen's egg, with a whitish exterior and a yellowish interior core (Fig. 4A). There was no epithelial component in the mass (Fig. 4B).