Special staining for elastin to assess pleural involvement.
Confirmatory immunohistochemistry to determine the primary site of origin.
100x Verhoeff van Gieson: Tumour approaches elastica lamina of pleura.
200x Verhoeff van Gieson: Tumour is very close to but does not disrupt the elastica lamina.
100x PSA: Focal positive staining.
200x PSAP: Focal positive staining.