Carl Groenewald

Trypan blue staining of internal limiting membrane and epiretinal membrane during vitrectomy: visual results and histopathological findings.

Aims: To report on the use of trypan blue (TB) 0.06% for staining the internal limiting membrane (ILM) and epiretinal membrane (ERM) during vitrectomy and report on their histology. Method: 14 consecutive patients with idiopathic macular hole or macular pucker (seven patients each) were prospectively recruited for ILM or ERM peel respectively. After pars plana vitrectomy and induction of posterior vitreous detachment, 0.5 ml TB 0.06% in phosphate buffered saline (VisonBlue) was injected over the posterior pole in an air filled eye and left for 2 minutes. The stained tissue was peeled with intraocular forceps. Specimens were evaluated using histochemical and immunohistochemical methods. Results: The average follow up was 4.4 months. Internal limiting membranes and epiretinal membranes were stained satisfactorily in all cases and removed successfully. Eight patients (57%) had improvement of 2 or more Snellen lines. All seven macular holes closed. In the ERM cases, no residual membranes were observed clinically, at the latest follow up. No complications relating to the use of the dye were encountered intraoperatively or postoperatively. Of the 14 procedures, nine (four macular hole and five macular pucker) yielded sufficient tissue for histopathological evaluation. Histological and immunohistological assessment revealed that the morphology of these specimens was similar to that observed in macular hole ILM and macular pucker ERM removed without the aid of dye. Conclusion: TB staining facilitated the identification and delineation of ILM and ERM removal during the surgical management of macular holes and macular pucker. The visual outcome of this series and the specimens removed suggest they are no different from those without TB staining. Its use in posterior segment appears to be safe but further studies are required to investigate its long term safety.

Visual loss following removal of intraocular silicone oil

Aim: To investigate the cause of visual loss following removal of intraocular silicone oil in patients who underwent vitrectomies for retinal detachment or giant retinal tear. Methods: The clinical records of three cases with visual loss following removal of silicone oil were reviewed. Investigations carried out included fundus fluorescein angiogram, optical coherence tomography, and electrophysiological studies. Results: Visual acuities dropped from 6/9 to 6/36 in two cases and 6/24 to 3/24 in the third. None of the three cases had macula detachment at any stage. Fundus fluorescein angiogram and optical coherence tomography were normal in all cases. Pattern electroretinogram showed reduced amplitudes of the P50 and N95 components. Multifocal electroretinogram indicated a selective damage to the central part of the macula. Conclusions: The results suggest that the abnormality arises predominantly in the central part of the macula, especially the outer and middle layers. However, the exact mechanism still remains obscure.

New surgical approach in the management of pseudophakic malignant glaucoma

PURPOSE To describe a new surgical approach in the management of pseudophakic malignant glaucoma. DESIGN Noncomparative case series. PARTICIPANTS Five consecutive patients with pseudophakic malignant glaucoma. METHODS All patients underwent zonulo-hyaloido-vitrectomy. The procedure involves the performance of zonulectomy, hyaloidectomy, and anterior vitrectomy (zonulo-hyaloido-vitrectomy) through a peripheral iridectomy or iridotomy via the anterior chamber. MAIN OUTCOME MEASURES Medications, visual acuity, intraocular pressure, and anterior and posterior segment findings were recorded before and after surgery. RESULTS Resolution of the malignant glaucoma was achieved in all cases. No recurrences were observed after a median follow-up of 5.5 months (range, 1-9 months). In one patient with extensive anterior synechiae, bleb failure occurred after the resolution of the malignant glaucoma. This patient was treated successfully with a guarded filtration procedure supplemented with 5-fluorouracil. No other complications were observed. CONCLUSIONS Zonulo-hyaloido-vitrectomy via the anterior segment appears to be an alternative option in the treatment of patients with pseudophakic malignant glaucoma.

Rhegmatogenous retinal detachment after transscleral local resection of choroidal melanoma

OBJECTIVE To report on the incidence and outcome of rhegmatogenous retinal detachment after transscleral local resection of choroidal melanoma. DESIGN Prospective, noncomparative, interventional case series. PARTICIPANTS One hundred fifty-six patients with choroidal melanoma treated by transscleral local resection between January 1993 and June 2000. INTERVENTION Transscleral choroidectomy or cyclochoroidectomy for uveal melanoma, with ocular decompression by single-port pars plana vitrectomy and, in most patients, adjunctive ruthenium plaque radiotherapy. MAIN OUTCOME MEASURES Incidence of rhegmatogenous retinal detachment according to predictive factors and outcomes reported in terms of anatomic success, visual acuity, and ocular conservation. RESULTS Rhegmatogenous retinal detachment occurred in 28 (18%) eyes and was significantly more common in patients with thick tumors (Cox univariate analysis, P = 0.001) and in males (Cox univariate analysis, P = 0.013), with posterior tumor extension being of borderline significance (Cox univariate analysis, P = 0.069). Surgical treatment of the retinal detachment was performed in 25 patients; it was undertaken at our center in 22 patients and at the referring hospital in 3 patients. Anatomic success was achieved in 21 (84%) of these 25 patients, with 7 eyes retaining counting fingers vision, and 3 eyes seeing 6/60 or better. Ten eyes treated for retinal detachment were enucleated because of recurrent tumor (four eyes), retinal detachment (three eyes), wound dehiscence (one eye), phthisis (one eye), and poor visual acuity (one eye). Eleven eyes known to have a retinal tear underwent prophylactic vitreoretinal surgery at the end of the local resection, with only one (9%) of these subsequently developing retinal detachment. CONCLUSIONS Rhegmatogenous retinal detachment after transscleral choroidectomy or cyclochoroidectomy for uveal melanoma is a serious complication requiring early vitreoretinal surgery.

Determinants of visual outcome after pars plana vitrectomy for posteriorly dislocated lens fragments in phacoemulsification

Purpose: To evaluate the visual outcome of patients with posteriorly dislocated lens fragments after phacoemulsification managed with pars plana vitrectomy (PPV) and identify risk factors for poor visual outcome. Setting: Vitreo‐Retinal Service, St. Paul Eye Unit, Liverpool, United Kingdom. Methods: The medical records of all patients who had PPV for posteriorly dislocated lens fragments after phacoemulsification between March 1993 and August 1998 were retrospectively reviewed. Demographics, preexisting eye conditions, details of the previous cataract surgery, findings at presentation, details of the vitreoretinal procedure, final visual acuity, and complications observed during the follow‐up were evaluated. Univariate and multiple regression analyses were used to determine the significance of these clinical variables as determinants of poor visual outcome (visual acuity 6/12 or worse). Results: Of the 106 patients identified, 89 had a full set of data and were included in the study. In 79 patients (89%), PPV was performed from 1 to 357 days (median 15 days) after cataract extraction. In 10 patients (11%), PPV was done on the same day as the cataract surgery. Sixty‐two patients (69%) had a final visual acuity of 6/12 or better. Preexisting eye disease (P < .01), PPV delayed for more than 4 weeks (P < .03), occurrence of retinal detachment after vitrectomy (P < .01), and the use of ultrasound (US) fragmentation (P < .01) were statistically significantly correlated with a poor visual outcome. Conclusions: Posterior dislocated lens fragments after phacoemulsification were safely retrieved using PPV. It appears that intervening early (within 4 weeks) and avoiding the use of US fragmentation are associated with a better visual outcome and reduced rate of postoperative complications.

Peel and peel again

Aim: To determine if the internal limiting membrane (ILM) was present in the epiretinal membrane (ERM) when we deliberately tried to perform a “double peel” for macular pucker. Methods: Pars-plana vitrectomy and a “double peel” were carried out. The ERM and ILM were stained with Trypan Blue and peeled separately over the same area. The amount of ERM present in ILM specimens and the amount of ILM present in ERM specimens were evaluated by histological examination. Results: Seventeen eyes in 17 patients were included. It was possible to double peel in all cases. Five of 17 ERM specimens (29%) contained ILM fragments. When ILM was present on the ERM, it represented less than 50% of the sample. One ILM specimen was lost as result of an administrative error; of the remaining 16 specimens, residual ERM was found in six, and cellular remnants were observed on the vitreous surface in a further six of the ILMs. Clinically, no recurrence of ERM was found. Conclusion: ILM was present in some ERM specimens seemingly over the same area that an intact ILM was subsequently peel. We speculate that the ILM in the ERM represent a secondary basement membrane and that the surgical plane of dissection for most ERM peel is between the ERM and the native ILM, making it feasible to double peel routinely.

Long-term outcome of primary endoresection of choroidal melanoma

Background Endoresection of choroidal melanoma may offer the best hope of conserving vision in some patients but is controversial because of concerns regarding iatrogenic tumour dissemination. Methods Retrospective, non-randomised study of consecutive patients who underwent endoresection for choroidal melanoma at the Liverpool Ocular Oncology Centre between 1996 and 2010. Results The study included 71 patients with a mean age of 58.7 years. The tumour extended within 2 disc diameters of the optic disc in 46 (65%) eyes, involving the disc in 24 (34%) eyes. The mean largest basal tumour diameter and tumour thickness were 9.5 mm and 4.4 mm, respectively. The median follow-up was 4.1 years. The visual acuity at the latest follow-up was better than 6/30 in 31% eyes. The main causes of visual loss were foveal excision, rhegmatogenous retinal detachment (RD) and proliferative vitreo-retinopathy (PVR). Local recurrence developed in two patients (3%), who were treated by enucleation and proton beam radiotherapy, respectively. RD occurred in 16 cases (22%). Three (4%) eyes were enucleated, two because of PVR and one because of local tumour recurrence. Five patients died of metastatic disease. Conclusions Endoresection achieved high rates of local tumour control. This operation would seem to be a useful alternative to radiotherapy as a means of conserving vision in eyes with juxtapapillary melanoma.

Treatment of retinal folds using a modified macula relocation technique with perfluoro-hexyloctane tamponade

Retinal folds are a relatively uncommon complication of retinal surgery. Macula involvement can produce poor acuity and disturbing metamorphopsia. We report a novel treatment for macula fold using the surgical techniques of foveal translocation and perfluorohexyloctane (F6H8), a new heavier than water agent licensed for long term internal tamponade.1,2 A 51 year old man with Terson’s syndrome was found to have retinal detachment on B-scan ultrasonography. He underwent vitrectomy and lensectomy with C2F6 gas tamponade for a superior, macula off retinal detachment. He was postured face down overnight. A retinal fold crossing the macula was noted on the first postoperative day (Fig 1A). At 3 months the best corrected acuity was 6/24. The patient described the image in the affected eye as being split diagonally, with the two half images separated. He was referred to our unit for further management. Figure 1 Fundus photograph showing macula fold before surgical correction (A), and 7 weeks after correction (B). We used a 41 gauge needle to …

Management of patients with uveal metastases at the Liverpool Ocular Oncology Centre

Background Uveal metastasis is the most common intraocular malignancy. Methods This was a retrospective study of all patients with uveal metastases referred to the Liverpool Ocular Oncology Centre between January 2007 and December 2012. Biopsy was performed as a primary investigation if the clinical examination suggested metastasis with no evidence of any extraocular metastases. Results Ninety-six patients (109 eyes) were included. Breast and lung carcinomas were the most common primary malignancies, affecting 41 and 27 patients, respectively. The median time interval between detection of primary cancer and uveal metastasis was 24 months (range 1–288 months). Thirty-nine patients underwent ocular biopsy, confirming the diagnosis in all patients. The biopsy indicated the site of origin in 24 out of the 27 without a known primary tumour. In 7 of these 27 cases, previous systemic investigations had failed to identify the primary tumour. Seventy-three patients received external beam irradiation; two patients received photodynamic therapy; and two patients had Ru-106 plaque radiotherapy. The visual acuity was stable or improved in 75.5% of the cases. Conclusions Immediate biopsy provides a quick diagnosis that may expedite treatment and improve any opportunities for conserving vision while facilitating the general oncologic management on these patients.

Trans-scleral local resection of toxic choroidal melanoma after proton beam radiotherapy

Aim To report on trans-scleral local resection of choroidal melanoma for exudative retinal detachment and neovascular glaucoma (toxic tumour syndrome) after proton beam radiotherapy (PBR). Methods A non-randomised, prospective study of secondary trans-scleral local resection of choroidal melanoma for exudative retinal detachment with or without neovascular glaucoma after PBR. The patients were treated at the Liverpool Ocular Oncology Centre between February 2000 and April 2008. The trans-scleral local resection was performed with a lamellar-scleral flap, using systemic hypotension to reduce haemorrhage. Results 12 patients (six women, six men) with a mean age of 51 years (range 20–75) were included in this study. The tumour margins extended anterior to ora serrata in six patients. On ultrasonography, the largest basal tumour dimension averaged 12.4 mm (range 6.8–18.1) and the tumour height averaged 7.1 mm (range 4.2–10.7). The retinal detachment was total in seven patients. Neovascular glaucoma was present in four patients. The time between PBR and local resection had a mean of 17.4 months (range 1–84). The ophthalmic follow-up time after the local resection had a mean of 46.2 months (range 14–99). At the latest known status, the eye was conserved in 10 patients, with a flat retina in all these patients and visual acuity equal or better than 6/30 in four patients. The reasons for enucleation were: patient request for enucleation when rhegmatogenous retinal detachment complicated the resection (one patient) and phthisis (one patient). Conclusions Exudative retinal detachment, rubeosis and neovascular glaucoma after PBR of a choroidal melanoma can resolve after trans-scleral local resection of the tumour. Our findings suggest that these complications are caused by the persistence of the irradiated tumour within the eye (‘toxic tumour syndrome’).