The effects of steroid instillations and hematomas on the pseudosheaths around miniature breast implants in rats.

In a controlled study in rats, neither the instillation of steroids nor the presence of hematoma alone had a significant effect on pseudosheath thickness or on the intra-prosthetic pressure of mammary implants. The presence of hematoma plus steroid instillation did, however, cause an increased intra-prosthetic pressure, but these did not cause a change in the thickness of the pseudosheath.