The results of 227 partial nephrectomies for stone were reviewed. Radiologically visible calcification remaining in the kidney at the end of the operation increased the risk of further stone formation. Ipsilateral and contralateral true recurrence rates after partial nephrectomy were the same, and increased with time up to 34% at 20 years. Ipsilateral recurrence rates after partial nephrectomy were half those found in a similar study of nephrolithotomy, pyelolithotomy and ureterolithotomy. Anatomical factors are important in stone formation, and partial nephrectomy is of value in the management of renal stones.

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Vitreous involvement as a result of penetrating trauma complicates and worsens the prognosis in retinal detachment repair. Seven patients in whom poor visualization of the fundus seemed to preclude success by routine procedures underwent combined vitrectomy, scleral buckling, release of subretinal fluid, and intravitreal gas injection. The retina was successfully reattached in five of the seven patients, although postoperative visual acuity was limited - possible on account of the duration of retinal detachment prior to repair or because of the degree of macular involvement.

We have used the vitrophage for combined lensectomy and vitrectomy in six eyes with congenital cataracts. No intraoperative complications were encountered. One week after operation four of the six eyes had clear corneas, and all eyes showed a bright red reflex. With follow-up ranging from 18 to 21 months all eyes had clear corneas and a view of the posterior pole consistent with 20/20 vision.

Fifteen patients underwent a pars plana approach vitrectomy and membranectomy after acute and chronic injury. I n all cases the lens fragments, hemorrhage, and secondary membranes were removed restoring clarity to the ocular media. In two cases the final visual acuity was limited by preexisting retinal injury. The advantages of pars plana approach are the small incision and minimal ocular manipulation during surgery. In the presenre of retinal injury, diathermy during the procedure or photocoagulation within 24 hours is also indicated.