A 58-year-old man with a remote history of diffuse large B-cell lymphoma (DLBCL), status post chemotherapy, radiation, and peripheral blood stem cell transplantation, presented with splenic nodular sclerosis classical Hodgkin lymphoma. He was found to have aortic and mitral valve mass lesions. The mitral valve mass showed typical histologic and immunophenotypic features of nodular sclerosis classical Hodgkin lymphoma, whereas the aortic valve mass and aortic mitral curtain tissue showed DLBCL with necrosis. Both tumors were Epstein-Barr virus positive and were clonally related; however, they were not related to his DLBCL from 14 years prior. This is the first case report of a patient with a composite lymphoma affecting two cardiac valves.
Patients with histories lymphoma are at lifelong risk for developing both recurrences and different forms of lymphoma; however, involvement of the cardiac valves is very rare. Composite lymphomas, in which there are two types of lymphoma in a single anatomic site, are also remarkably rare. We present a patient with a history of diffuse large B-cell lymphoma (DLBCL), status post chemotherapy, radiation, and peripheral blood stem cell transplantation (PBSCT), who developed clonally related Hodgkin and non-Hodgkin lymphoma involving his aortic and mitral valves 12 years after PBSCT.
In 1995, our patient was diagnosed with DLBCL on a tonsillar biopsy. He was treated with 8 cycles of cyclophosphamide, doxorubicin, vincristine, and prednisone and radiation to the tonsillar region. In 1996, he was diagnosed with a recurrence in the left upper arm. He received dexamethasone, cytarabine, and cisplatin salvage chemotherapy, achieving a partial response, and proceeded to carmustine, etoposide, cytarabine, and cyclophosphamide conditioning and PBSCT. After transplantation, he received adjuvant radiation therapy to the left upper extremity. He then did well for many years.
In December of 2008, a positron emission tomographic/computed tomographic scan performed for systemic symptoms showed lesions within the spleen and splenic hilar adenopathy. The patient underwent laparoscopic splenectomy. Pathology of the spleen and a peripancreatic lymph node demonstrated nodular sclerosis classical Hodgkin lymphoma (CHL). The tumor was positive for Epstein-Barr virus (EBV).
As part of a prechemotherapy evaluation, the patient underwent transthoracic echocardiography. It revealed a 2.2 × 1.6 cm mass attached to the atrial aspect of the anterior mitral leaflet. There was associated mild to moderate mitral regurgitation and mild stenosis. A 1.1 × 0.3 cm lesion was attached to the ventricular aspect of the noncoronary aortic valve cusp. There was mild to moderate aortic regurgitation. The ejection fraction was normal at 59%, without regional wall motion abnormalities. The estimated right ventricular systolic pressure was 48 mm Hg. The patient was hospitalized for further evaluation of the cardiac masses.
The patient denied fever, chills, rigors, vision changes, neurologic, and cardiovascular symptoms. He appeared well and had no stigmata of endocarditis. The cardiac apex was palpated at the sixth intercostal space and midclavicular line. The first heart sound was increased, and the second heart sound was normal. A grade II/VI systolic murmur was noted at the apex, which radiated to the axilla. There was no adenopathy.
Transesophageal echocardiography ( Figure 1 , Videos 1 and 2 ) confirmed the transthoracic echocardiographic findings of an echo-dense, broad-based mass attached to the anterior mitral valve leaflet. There was minimal mitral inflow obstruction, with a mean gradient of 3 mm Hg at a heart rate of 76 beats/min and mild mitral valve regurgitation. The differential diagnosis for the mitral valve mass included infection, metastatic tumor to the heart, primary cardiac tumor, marantic endocarditis, and thrombus. A linear echo-dense structure was identified on the noncoronary cusp of the thickened aortic valve. The differential diagnosis of the aortic valve lesion included infection, metastatic tumor to the heart, primary cardiac tumor, marantic endocarditis, fibroelastoma, and degenerative change. Blood cultures and serologic studies were performed and were negative. For tissue diagnosis and concern for embolism, the patient was referred for cardiac surgery.
Two-dimensional and three-dimensional intraoperative transesophageal echocardiography was done. The prebypass images showed a mass attached to the middle scallop (A2 segment) of the anterior mitral valve leaflet ( Figure 2 , [CR] ). A primary median sternotomy was performed, and the patient was placed on cardiopulmonary bypass. A large tumor was noted on the anterior leaflet of the mitral valve ( Figure 3 ). It covered almost the entire anterior leaflet and extended up into the anterior lateral trigone. The tumor was resected except for a thin layer on top of the mitral valve. On the aortic valve, there were multiple necrotic-appearing masses along the edges of all 3 cusps. There were also 2 pea-shaped masses on the aortomitral curtain below the left aortic valve cusp. They were debrided and debulked. Postbypass transesophageal echocardiographic imaging showed moderate mitral valve regurgitation and mild to moderate aortic valve regurgitation. Because of the degree of regurgitation after resection of the mass, and the frozen-section pathologic results of suspected lymphoma, valve replacement was deferred.