The vesicles push ups are a process trauma that is characterized by the appearance in the subcutaneous tissue superimposed on the breastbone of a series of vesicles or blisters of different sizes.

The disease presents asymptomatically. It is a type of disease, is important in birds for meat.

The hens and turkeys, and the size is suitable for sending to the market, usually present cystic formations between the skin of the chest and the keel.

Usually given to these formations, the name of the bladders of the chest, which is incorrect, as it is a vesicle that forms in the skin. They are more common in the males of the race's heavy and are seen rarely in females or in layers.

The cysts of the keels, which suggested that O'neil (1934) the name of bursa synovialis presternalisthey vary in size from that of a small bean to formations of about 7.5 cm in length and 2 cm in diameter.

Usually, it contains a cavity that is filled with a liquid, brownish-gray, sterile and viscous. It is not known more specific cause of pressure or mechanical friction.

Bird (1944) found that the presence and the severity of the condition depended on the thickness of the bird's in the chest, with respect to the total weight of the body.

It was also found that the weight or pressure exerted on the perches or roosting bars by the bird while it remains on them causes inflammation; this is closely related to the relative thickness of the bird’s body.

An important factor in minimizing breast blisters as much as possible depends on the perches and the birds' bedding. If the perch is not the correct or appropriate shape (see photo).

Similarly, twisted spurs may develop; furthermore, on a hard, damp surface, the same consequences arise—both infected blisters and deformed spurs—caused by the bird’s weight and difficulty walking; as a result, it remains lying on the ground for long periods of time.