Papilloma

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papilloma

[‚pap·ə′lō·mə]
(medicine)
A growth pattern of epithelial tumors in which the proliferating epithelial cells grow outward from a surface, accompanied by vascularized cores of connective tissue, to form a branching structure.

Papilloma

 

a benign tumor of man and animals; its basic structural element is a connective-tissue papilla covered with epithelium and containing vessels. The growth of the papillae in various directions sometimes gives a papilloma the appearance of a cauliflower. The presence of numerous papillomas is called papillomatosis. Papillomas are most commonly found on the skin, although they sometimes occur on mucous membranes. In man, they may be congenital or may result from chronic inflammatory irritation. Some papillomas are viral in origin, for example, those of the sexual organs. The recommended therapy is surgical removal.

Papillomatosis in animals is caused by locally specific viruses. It affects cattle, horses, dogs, and rabbits and occasionally goats, sheep, and wild animals. The infection is caused by diseased animals; natural infection results from contact between diseased and healthy animals. The disease is long in duration. Isolated coral-like papillomas appear and then spread. Their surface is dry, horny, and cracked. When injured, papillomas bleed and become infected and ulcerous. Diagnosis is based on clinical and histological examination. Treatment generally consists of surgical removal.

I. I. VORONIN

References in periodicals archive ?
Inverted papilloma of the ureter with non-functional kidney: A case report [in Japanese].
Case Report: Laparoscopic Resection of Ureteral Inverted Papilloma.
Is surveillance necessary for inverted papilloma in the urinary bladder and urethra?
On the other side, inverted papilloma consists of thin anastomizing cords and nests of normal urothelium, with peripheral palisading of basal cells and central streaming.
Inverted papilloma showed a significantly higher number of lesions showing epithelial staining for p63 and 34[beta]E12 (Figure 3, D) than SNAC (Table 3).
Their unique tendency to invert into underlying connective tissue stroma, which was first described by Ringertz in 1938, (4) led to the term inverted papilloma.
The characteristic clinical attributes of inverted papilloma are a tendency to recur, a capability to destroy surrounding structures, and an association with malignancy.
In this article, we describe our study of 9 cases of inverted papilloma that were resected with the KTP-532 laser endoscopically.
However, the gland proliferation in inverted papilloma is located only in the base of the papilloma, where it arises from the nasal epithelium and not throughout the lesion as in the READ hamartoma.
Endoscopic surgical treatment of nasal and paranasal sinus inverted papilloma.
Transnasal endoscopic medial maxillectomy in inverted papilloma.
Endoscopic resection of inverted papilloma of the nose and paranasal sinuses.