Neoplasms
of the bladder
Ninety-five per cent of primary bladder tumours originate in :he
epithelium; the remainder arise from connective tissue angioma, myoma, fibroma
and sarcoma) or are extra adrenal phaeochromocytomas.
Secondary
tumours of the bladder are not rare and most commonly arise from a neighbouring
organ, particularly the
Pathology
Benign papillary tumours.
Many histopathologists will not diagnose
benign papillomas of the bladder, stating that most of them are merely better
differentiated types of superficial bladder cancer. The papilloma consists of a
single frond with a central vascular core with villi; it looks like a red
sea-anemone (Figs 65.48 and 65.49). Inverted papilloma is a condition
where the proliferative cells penetrate under normal mucosa so that the lesion
is covered with smooth urothelium — it is benign.