True Papilloma of the Nasal Cavity

Inverted papilloma of paranasal sinuses

“…Ringertz (1938) recognized the characteristic endophytic growth pattern and coined the term 'inverting papilloma'. Synonyms for the same entity were 'genuine papilloma of the nasal cavity' (Kramer and Som, 1935), 'inverting papilloma' (Norris, 1963), and 'inverted papilloma' (Fechner and Alford, 1968;Hyams, 1971). Berendes (1966) noted the tendency towards destructive growth, recurrence, and epithelial metaplasia and named it 'malignant papilloma'.…”

Inverted papilloma of frontal sinus with intracranial extension

“…4 In 1938, Ringertz coined the term "Inverted papilloma" based on its histological findings of inversion of epithelium into underlying stroma. 5 It is a benign but locally aggressive tumour having high chance of recurrence and high risk of association with malignancy.…”

Sinonasal Inverted Papilloma

“…It was first described by Ward in 1854 and Billroth in 1855. 2 Its typical histological description was given by Ringertz in 1938. 3 It comprises about 0.5-4% of total nose and paranasal sinus tumours.…”