Our primary aim is to demonstrate a higher efficacy for manual aspiration in terms of a shorter admission duration (LOS) in favor of manual aspiration with similar therapy success rates. We will analyse data on an intention to treat basis. P-values below 5 % will be considered statistically significant. Normal distribution will be checked. Means (standard deviations) or medians (ranges or interquartile ranges) will be calculated and unpaired t-tests or Mann Whitney U tests will be used as appropriate to test differences in LOS. Categorical data (success rates) will be analysed using Chi2-tests. Data analysis will be performed using SPSS version 12.