Gross appearance: The specimen consisted of a mass, 15 x 5 x 4 cm, that was well-circumscribed, but not encapsulated, and covered by a thin layer of fatty tissue. Section showed homogeneous, dark red tissue without lobulation. A 2-cm nodule that was firm and grey was received separately.

Histologic Features

A section of the main mass showed a narrow rim of viable tumor forming irregular nests (lower right) in a cellular stroma. The rest of the mass, corresponding to the dark red tissue seen grossly and the low attenuation on the CT scan, was necrotic (pink tissue at upper left that is demarcated by a zone of hyperemia). The diffuse necrosis suggested an ischemic cause rather than patchy tumor necrosis.

Clinical summary Image 2

Table of Contents