The tumor typically shows features of angiosarcoma including vasoformative architecture with hobnailed appearance and it has infiltrative margins. |
It can appear as a solid infiltrative lesion or as a polypoid intraluminal mass that arises in the base of the bladder or in the region of the bladder trigone. |
The infiltrative nature of the mass suggested malignancy, and ductal resection was deemed necessary for adequate margins. |
On microscopy, sections showed interlacing fascicles of spindled cells with diffuse pleomorphism, increased mitotic activity, and a focally infiltrative border. |
An infiltrative appearance due to presence of the hyperplastic foci between benign glands may be seen. |
The small intestine had a 1.7-cm, firm mural nodule with intact mucosa but showed infiltrative growth into the mesenteric fat. |