Postoperative cardiac homograft involvement in Erdheim-Chester disease.

Erdheim-Chester disease (ECD) is a rare multisystem disorder which is known to affect the skin, lungs, bone, pituitary gland, retroperitoneum and cardiovascular system. The case is described of a patient with ECD who had previously undergone a Ross procedure for presumed endocarditis involving the aortic valve and aortic root. The patient subsequently developed arthralgias, abdominal pain (requiring an exploratory laparotomy) and polydipsia. Furthermore, he developed progressive, symptomatic stenosis of the pulmonic homograft. A reoperative replacement of the homograft was required. The clinically suspected diagnosis of ECD was confirmed by a pathologic analysis of the explanted pulmonary homograft, and also (retrospectively) of previously resected mesenteric tissue. It is postulated that the patient may have developed ECD as a result of an immunologic reaction to the homograft tissue used for the Ross procedure.