Fig. 6From: Unusual giant multilocular thymic cyst with mature teratoma including a carcinoid component in the mediastinumImmunohistologically, a small part of these cells was diffusely positive for synaptophysin (a), chromogranin A (b) and CD 56 (c), confirming neuroendocrine differentiation. The tumor had five mitoses per ten high power fields, and the Ki-67 proliferation index was 8.0% (d), consistent with a Grade 2Back to article page