Primary signet-ring cell carcinoma of the urinary bladder (linitis plastica).

In this paper we describe the 16th case in the English medical literature of signet-ring cell carcinoma of the bladder, which occurred in a 65-year-old man who developed widespread abdominal metastases. This case illustrates the characteristic diffuse infiltrative pattern of this neoplasm. In addition to light microscopy, ultrastructural studies were performed.