Top of the Line Corrosion (TLC) is now known to be the main mode of failure in incident associated with a number of wet gas pipelines operated all over the world. TLC is nevertheless a relatively recent phenomenon in a sense that its existence was only acknowledged about 10 to 15 years ago. A number of research activities have been carried on since then and although there are still a number of uncertainties the main aspects of the mechanism involved in TLC have been identified. This paper presents a review of the laboratory work performed on the topic with a detailed list and analysis of the different experimental setups proposed for its study. The latest findings in the specific influence of each controlling parameters (water condensation rate organic acids hydrogen sulfide flow regime …) is also laid out. A number of TLC predicting tools (some empirical some mechanistic) have also been developed based on the current understanding and their value and limitations are discussed as well.