The authors report a case of a 69 year old man with a peritoneal pseud
o-myxoma probably secondary to a mucocele of the appendix and complica
ted by pleural metastases which were nodular, unilateral and asymptoma
tic. These were discovered on computerised tomography during examinati
on for the recurrence of the peritoneal disease. A study of the histol
ogy of the pleural fragments obtained by thoracotomy showed the presen
ce of lesions which were identical to those Sound in the peritoneal ma
sses.