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450

Solitary fibrous tumor of the pleura: Histology (3).

Uniform spindle cells in a collagenous stroma.

Alternating hypocellular and hypercellular areas.

Hemangiopericytoma-like vascular pattern.

451

Solitary fibrous tumor of the pleura: Immunohistochemistry.

Positive: CD34, CD99, bcl-2.

Negative: Cytokeratins (usually).