Figure 2.

Gross and microscopic pathology. Gross pathology showed an encapsulated mass weighing 40.0 g and measures 5.5 × 4.5 × 3.8 cm. Section of the mass showed a lobulated, tan-white rubbery architecture occupying the vast majority of the specimen with a rim of surrounding capsule. Small foci of yellow discoloration with possible microcalcifications and necrosis were identified. Some nodules showed red discoloration with thin fibrous septae. On microscopic pathology, neuroblastic cells were seen in a background of apoptosis and karyorrhectic debris and scattered lymphoid aggregates. Some degree of nuclear pleomorphism with multinucleated forms and larger cells with hyperchromatic nuclei as well as abundant mitoses were present. The mitotic karyorrhectic index was in the intermediate range.