2.  A 24-year-old male suffers from congestive heart failure. He has no history of therapeutic or illicit drug use, valvular disease, or systemic disorder. A myocardial biopsy shows myofibers arranged as seen in this picture. Occasional fibers contain basophilic granules. These morphologic features are most consistent with:

  3.  A 30-year-old woman presents with skin rash and signs and symptoms of congestive heart failure. Investigations reveal impaired diastolic function with preserved systolic function. An endomyocardial biopsy shows thickened endocardium covered with thrombus, as seen in this picture. A mononuclear and eosinophilic infiltrate is seen in the endocardium. Which of the following is the most likely diagnosis?

  4.  An endomyocardial biopsy reveals expansion of the myocardial interstitium by a pale eosinophilic substance. Congo red staining is positive. Deposition of which of the following is the most frequent cause of this condition?

  5.  A patient treated with chemotherapy for a lymphoid malignancy undergoes an endomyocardial biopsy, which is fixed in glutaraldehyde for ultrastructural analysis. The light microscopic appearance of toluidine-stained thick sections and the changes detected by electron microscopy (EM) are shown in these photomicrographs. Which of the following is the most likely cause of these findings?

  6.  In order to make a morphologic diagnosis of definite myocarditis, which of the following changes is required?

  7.  A 27-year-old man presents with rapid onset of heart failure and ventricular arrhythmias. An endomyocardial biopsy reveals the changes shown in this picture. Which of the following is the most likely diagnosis?

  8.  According to the 2004 revised grading system of the International Society for Heart and Lung Transplantation (ISHLT), an endomyocardial biopsy with a single infiltrate of mononuclear infiltrates distorting the myocardial architecture and associated with myocyte damage is graded as:

  9.  Two weeks after cardiac transplantation, an endomyocardial biopsy demonstrates a single well-demarcated, mononuclear infiltrate in a subendocardial location, as shown in this photomicrograph. Numerous plasma cells are found within the aggregate. Immunostains reveal CD20-positive B lymphocytes and CD21-positive dendritic cells in the core of the lesion, surrounded by a rim of CD3-positive T cells. Which of the following is the most likely morphologic diagnosis?

10.  An endomyocardial biopsy of a heart allograft reveals interstitial edema, sparse lymphohistiocytic infiltrates, and swelling of capillary endothelium. The key findings of immunohistochemistry for CD68 and complement component C4d are shown in these photomicrographs. These findings are typically associated with:

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