Exegesis:

kai idou ‘and behold’ cf. 1.20.

anthrōpos tis ēn … emprosthen autou ‘there was a man in front of him.’ tis has the force of an indefinite article.

hudrōpikos ‘suffering from dropsy’ (apposition to anthrōpos), i.e. from effusion of watery fluid into the tissues or cavities of the body, cf. IDB I, 872.

Translation:

Who had dropsy. The name of some kind of oedema, such as beri-beri, can often be used (as in some Indonesian languages, Ekari), or of a rheumatic ailment causing swellings (Zarma); or a descriptive phrase, e.g. ‘swollen all over’ (Tzeltal), ‘whose whole body was swollen’ (Tae’), “whose legs and arms were swollen” (Good News Translation, similarly in Kituba).

Quoted with permission from Reiling, J. and Swellengrebel, J.L. A Handbook on the Gospel of Luke. (UBS Handbook Series). New York: UBS, 1971. For this and other handbooks for translators see here . Make sure to also consult the Handbook on the Gospel of Mark for parallel or similar verses.