Calcifying fibrous pseudotumour of visceral peritoneum

Calcifying fibrous pseudotumour, a recently characterized rare but distinctive lesion, has been reported previously only in soft tissues and in the pleura. We describe four cases of calcifying fibrous pseudotumour which arose in the visceral peritoneum of the small bowel and stomach.

In contrast to the calcifying fibrous pseudotumour of soft tissues which generally occurs in children, all four cases in our report occurred in adults. We consider the calcifying fibrous pseudotumour to be a distinctive tissue reaction.

Its characteristic appearance of concentric whorls of lamellated collagen associated with psammoma bodies and other forms of dystrophic calcification is entirely different from all other lesions displaying hyaline collagenous deposits, such as inflammatory pseudotumour, desmoid, hyalinizing granuloma or fibrous plaques of peritoneum.