Ultrastructural findings in feline corneal sequestra.

Objectives: (1) To describe the ultrastructural features of corneal sequestra in cats; and (2) to enhance our understanding regarding the pathogenesis of feline corneal sequestration.

Methods: Nine corneal sequestra were harvested via keratectomy from globes of nine cats. The sequestra were routinely fixed then postfixed for high resolution light and transmission electron microscopy (HR-LM and TEM, respectively).

Signet ring cell adenocarcinoma of the urachus.

Signet ring cell adenocarcinoma of the urachus is an extremely rare variety of adenocarcinoma of the urachus; only 23 cases have been reported in the literature to date. In the present report we discuss two more cases of this type and review the literature. For our first case, a 17-year-old man was treated with partial cystectomy with en-bloc excision of the urachus and umbilicus.