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Ann Thorac Surg 2000;69:1644
© 2000 The Society of Thoracic Surgeons
a Department of Cardiothoracic Surgery, The Mount Sinai Medical Center, One Gustave L. Levy Place, Box 1028, New York, NY 10029, USA
To the Editor
Cowl and associates [1] are to be complimented on yet another documentation of a diaphragmatic defect accounting for the pathogenesis of catamenial pneumothorax. They mention that multifactorial causes are likely because of "a lack of a unifying source for each reported patient in the literature."
Recently I published an article entitled "Porous Diaphragm Syndromes" [2], which deals with and presents evidence for a "unifying source." Such seemingly disparate conditions as cirrhosis of the liver with ascites, laparoscopic operation, diagnostic and therapeutic pneumoperitoneum, peritoneal dialysis, Meigs syndrome, as well as catamenial pneumothorax and a few other miscellaneous conditions all exhibit the phenomenon of peritoneopleural transphrenic passage of fluids, blood, gases, tissues, or exudates by way of a common anatomic featurea defect in the diaphragm.
The diaphragmatic defect has been identified in representative examples of each one of these conditions, albeit not in every single case. In a number of reports in the literature the statement was made that the search for such a defect was not thorough enough.
An unanswered question is whether the defect is congenital, acquired, or both as there seems to be evidence for each of these.
Lastly, it is important to differentiate pulmonary from pleural endometriosis. The former, evidenced by parenchymal pulmonary deposits, is presumed to be a result of vascular "metastasis" by way of the uterine veins [3], whereas the latter is considered to be a manifestation of Sampsons theory of "retrograde menstruation" and transperitoneal transdiaphragmatic spread into the pleura [4]. The former presents as a pulmonary nodule at times peribronchial, often manifesting cyclical hemoptysis ("vicarious menstruation"), and not with pneumothorax.
I do not believe the prostaglandin release theory has anything to do with catamenial pneumothorax.
References
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