ABSTRACT
Surgical treatment of some renal neoplasia is partial nephrectomy; but in some cases subsequent injuries lead to complete nephrectomy. Cryogenic surgery as a minimally invasive procedure can be helpful in avoiding complete nephrectomy. The aim of the study is determination of the effect of cryosurgery on macroscopic and microscopic injury and healing of kidney tissue, along with determination of the speed and quality of healing compared with other current procedures. Cryogenic Partial nephrectomy was performed on posterior pole of left kidney of 6 male Dutch rabbit using contacting probe. After 1, 6 and 24 hours, and after 3, 7 and 14 days nephrectomy was done via laparatomy. After recording macroscopic properties of kidneys, they were processed for histopathologic studies. The freezed area in 1 to 24 hours' samples showed filling of renal tubes by RBCs, hemorrhage in glumerols, fibrinous deposition in capillaries and some interlobular venuls and arteries, along with initiation of cell necrosis. On 3,7,14 day samples, injured and non injured areas were separated by a transitional zone. Gradually, necrotic tissues were reabsorbed which resulted in involution of injured area that makes kidney smaller in size. It seems that cryosurgery is effective in healing. Cryogenic partial nephrectomy can be done easily and causes only limited injury during operation. This study showed that contacting probe has less invasive effect than needle probes and its healing process is faster and works through reabsorbtion of necrotic tissue