RESUMEN
<p><b>OBJECTIVE</b>To observe the natural process of adenoid growth and degeneration as the age grows, to investigate the related clinical significance and pathologic characteristics of hypertrophied adenoid.</p><p><b>METHODS</b>Totally 2650 (age 2 to 87) cases with nasal obstruction or/and other symptoms were included in the patients group, and 810 (age 3 to 85) subjects without symptoms were included as the control group. Morphological characteristics examined with nasal endoscope. Biopsy was performed for 39 cases. The adenoid was calcified as 4 degrees according to the size.</p><p><b>RESULTS</b>In the patient group, age 2 to 9, degree III and degree II adenoid were 81.1% (198/244) and 18.9% (46/244) respectively. And adenoid of children whose age 2 to 5 was 100.0% in degree III; In above 10 years old group, the adenoid was mostly degree II. In age 60 to 69 group, degree 0 was (66.5%), and in age 81 or above, degree 0 reaches 100%. And 19 years old was the youngest age at which adenoid of degree 0 started to be found and 21 was the oldest age at which there is no adenoid of degree III. In the control group, compared with the patient group, no statistical significant difference found in all other groups except in age 2 to 9 (degree III 57.9%, 22/38, degree II 42.1%, 16/38). Shapes of adenoids at degree II varied while degree I were almost like peeled orange. Pathologically, among children there are abundant of adenoidal lymph tissue, while in adults the lymph tissue getting less as age grows but with evident inflammation reaction. Among patients, the incidence of sinusitis and snoring was higher in degree III group compared with others, 47.4% and 18.7% respectively, and the differences is statistically significant (chi2 = 51.28, P < 0.01; chi2 = 40.26, P < 0.01).</p><p><b>CONCLUSIONS</b>Adenoid volume of children (age < 10) is the biggest, especially of children under 5 years old.</p>