Patient-Reported Outcomes of Medical Tattooing for Capillary Malformations.

BACKGROUND: Patients with capillary malformations (CMs) may undergo medical tattooing (MT) as an alternative to laser therapy. But little is known about treatment results and impact from the patients' perspective. OBJECTIVES: In this cross-sectional digital survey study, we evaluated the patient-reported outcomes of MT for CMs. METHODS: MT practices were identified via the Dutch Association of Skin Therapists and Google. These practices invited all their CM patients who had undergone MT between January 2011 and September 2021 to participate. Baseline and treatment characteristics, tattooing effectiveness, patient satisfaction with treatment outcomes, and complications were evaluated using a custom-made online survey. Quality of life was assessed with the Dermatology Life Quality Index (DLQI) questionnaire. Factors associated with treatment effectiveness and patient satisfaction were identified via bivariate analysis and ordinal logistic regression analysis. RESULTS: Most of the 89 respondents were female (69%). Almost all CMs were located on the face (90%) and mainly (dark) red (74%). Nearly all patients had undergone laser therapy (91%). Median number of tattooing sessions was 5 (IQR: 4.0-8.0). Thirty-seven percent of the patients perceived >75% color reduction. Younger patients were more likely to obtain lower treatment effectiveness (OR 0.44, 95% CI: 0.20-0.97). Most patients (83%) were satisfied with treatment results. Patients with lighter (OR 0.30, 95% CI: 0.13-0.72), non-facial (OR 0.15, 95% CI: 0.03-0.89), and hypertrophic CMs (OR 0.30, 95% CI: 0.11-0.82) were less likely to be satisfied with treatment outcomes. Patients with lighter skin types were more satisfied (OR 2.89, 95% CI: 1.23-6.80). Complications included transient pain (23%), bleeding (3.4%), hypertrophic scarring (1.1%), hypopigmentation (1.1%), and a halo around the tattoo (1.1%). CONCLUSION: MT seems a valid alternative treatment in addition to laser therapy for CMs, with mild complications. Most patients are (very) satisfied with treatment results, while color reduction is incomplete. Hence, it seems appropriate to decide together with patients whether or not to use MT as primary treatment or secondary to laser therapy.

Intraprocedural OCT monitoring of the immediate treatment response during indocyanine green angiography-guided laser therapy of teleangiectatic capillaries in diabetic macular edema.

In this retrospective study the morphological response of teleangiectatic capillaries (TCs) to focal laser treatment and the functional and morphological outcome after Indocyanine green angiography (ICGA)-guided laser therapy was evaluated. TCs in eyes with diabetic macular edema (DME) were treated with laser therapy. The immediate and subsequent reaction of the TCs lumina to direct photocoagulation was monitored with customized OCT single scans. Additionally, patients were treated with intravitreal anti-VEGF as needed. 12 eyes of 9 patients with treatment naive (6 eyes) and pretreated (6 eyes) DME were followed-up for a mean of 24 months (± 8.1SD). Best-corrected visual acuity improved from 0.25 logMar (± 0.2SD) to 0.12 (± 0.10SD; p = 0.06) at each patient's last visit. During laser treatment a darkening of the TCs lumina was achieved in 91.3% of lesions. All these lesions fully resolved, whereas TCs, which showed no darkening of their lumen in OCT persisted and required re-treatment with laser. Additional anti-VEGF injections were indicated in only one eye (8.3%). The darkening of the TCs lumina visible in OCT might provide an image-biomarker that indicates successful coagulation of aneurysmatic lesions. Consequently, a significant functional and morphological improvement with need for anti-VEGF treatment in only one eye, was achieved.Information concerning the registration of the trial: date of registration: 11th of december, 2019. Trial registration number: 107/2019.

Mechanical homeostasis of liver sinusoid is involved in the initiation and termination of liver regeneration.

Organogenesis and regeneration are fundamental for developmental progress and are associated with morphogenesis, size control and functional properties for whole-body homeostasis. The liver plays an essential role in maintaining homeostasis of the entire body through various functions, including metabolic functions, detoxification, and production of bile, via the three-dimensional spatial arrangement of hepatic lobules and has high regenerative capacity. The regeneration occurs as hypertrophy, which strictly controls the size and lobule structure. In this study, we established a three-dimensional sinusoidal network analysis method and determined valuable parameters after partial hepatectomy by comparison to the static phase of the liver. We found that mechanical homeostasis, which is crucial for organ morphogenesis and functions in various phenomena, plays essential roles in liver regeneration for both initiation and termination of liver regeneration, which is regulated by cytokine networks. Mechanical homeostasis plays critical roles in the initiation and termination of organogenesis, tissue repair and organ regeneration in coordination with cytokine networks.

Extent of Leptomeningeal Capillary Malformation is Associated With Severity of Epilepsy in Sturge-Weber Syndrome.

BACKGROUND: Individuals with Sturge-Weber syndrome (SWS) often expereince intractable epilepsy and cognitive decline. We hypothesized that the extent of the leptomeningeal capillary malformation (LCM) may correlate with the severity of neurological impairment due to SWS. We tested the hypothesis in a cross-sectional study of seizure severity and electroencephalographic (EEG) findings and a retrospective cohort study for surgical indications related to the extent of the LCM. METHODS: We enrolled 112 patients and classified them according to LCM distribution: (1) bilateral, (2) hemispheric, (3) multilobar, and (4) single lobe. Age at seizure onset, seizure semiology and frequency, and EEG findings were compared. Surgical indications were evaluated for each group by Fisher exact test, and predictors for surgery were evaluated by univariate and multivariate analyses. Therapeutic efficacy was evaluated by the SWS-Neurological Score (SWS-NS). RESULTS: The bilateral and hemispheric groups had early seizure onset (4.0 months old and 3.0 months old), frequent seizures (88.9% and 80.6% had more than one per month), focal-to-bilateral tonic-clonic seizures (88.9% and 74.2%), and status epilepticus (100% and 87.1%). The groups' EEG findings did not differ substantially. Surgical indications were present in 77.8% of the bilateral, 88.1% of the hemispheric, and 46.8% of the multilobar groups. Seizure more than once per month was a predictor of surgical treatment. Seizure subscore improved postoperatively in the hemispheric and multilobar groups. Even after surgical treatment, the bilateral and hemispheric groups exhibited higher SWS-NSs than members of the other groups. CONCLUSION: Our study demonstrated a strong association between extensive LCM and epilepsy severity. Surgical intervention improved seizure outcome in patients with SWS with large LCMs.

Vascular anomalies of the head and neck.

The head and neck are the most common site of involvement for vascular tumors and malformations, with more than half of all vascular anomalies seen in this region. Lesions in this location can cause significant disfigurement and can be associated with airway obstruction, impairment in vision or hearing, swallowing disorders and hemorrhage. Accurate diagnosis is critical in determining treatment, and interdisciplinary care is essential for optimal management. We review clinical and imaging features that are key to establishing the correct diagnosis, and review treatment modalities, with emphasis on interventional and surgical procedures.

[Treatment of necrotizing infection in patients with chronic arterial insufficiency of the lower extremities]. / Rezul'taty lecheniia nekrotiziruiushchei infektsii u patsientov s khronicheskoi arterial'noi nedostatochnost'iu nizhnikh konechnostei.

OBJECTIVE: To analyze the effectiveness of complex therapy of necrotizing infection using the original method of stimulation of angiogenesis in patients with chronic arterial insufficiency of the lower extremities. MATERIAL AND METHODS: In 53 patients, operations were performed using the proposed technologies for stimulation of angiogenesis. A control group consisting of 56 patients was formed to compare the results of treatment. They had standard vascular therapy for the correction of ischemia. Morphological studies of the muscles of the lower extremities included assessment of capillary bed density and spatial orientation of the capillaries before and after treatment. Computed angiography of the lower extremities followed by calculation of perfusion index was performed to assess changes in the microvasculature. Clinical evaluation of the results was carried out using R. Rutherford scale. RESULTS: Revascularization resulted significant augmentation of capillary bed density and the number of functioning capillaries in muscular tissue. This was accompanied by increased perfusion index and TcPO2 values. The effect of treatment is observed in 12-14 days after surgery and persists for a long time. The best outcomes are found in patients with ischemia grade IIb-III. Incidence of lower limb amputations was more than 2 times lower in the main group compared with the control group. CONCLUSION: Combined stimulation of angiogenesis including mechanical tunneling of the muscles of the affected limb and administration of platelet rich plasma is effective procedure. This method does not require complex equipment and may be used in the treatment of patients with complications of chronic lower limb ischemia and contraindicated direct arterial reconstruction.

Novel RASA1 mutations in Japanese pedigrees with capillary malformation-arteriovenous malformation.

Capillary malformation-arteriovenous malformation (CM-AVM, MIM#608354) is a rare autosomal dominant disorder characterized by multiple cutaneous capillary malformations co-occurring with fast-flow vascular anomalies, such as arteriovenous malformation or fistula. Despite the identification of RASA1 as the first causative gene in Western patients with CM-AVM, there have been no literature reports of Japanese patients with this gene mutation. We herein report two Japanese pedigrees harboring multiple affected members with CM-AVM. Whole-exome sequencing in the two probands identified novel heterozygous mutations in RASA1, which were co-segregated with the disease in each family and were not reported in large-scale sequencing databases. One was a frameshift mutation and the other a splice-site mutation causing aberrant splicing, confirmed by a minigene assay. There were no other genes commonly disrupted among these probands. RASA1 was a major causative gene even in Japanese patients with CM-AVM, although obvious locus heterogeneity was known for this disease.

Somatic GNAQ mutation in different structures of port-wine macrocheilia.

BACKGROUND: Port-wine macrocheilia (PWM) involves a congenital, progressive capillary malformation that results in soft-tissue hypertrophy in the lips. Its aetiology has not yet been fully elucidated. OBJECTIVES: To investigate frequencies of GNAQ mutation in different tissues from patients with PWM, including skin, mucosa, gland and muscle, using samples obtained during cheiloplasty. METHODS: Targeted next-generation sequencing of GNAQ was designed and performed to assess DNA extracted from 80 different affected tissues from 20 patients with PWM. RESULTS: The GNAQ R183Q mutation was not detected in gland samples but was found in 90%, 95% and 95% of the skin, mucosal and muscle samples, respectively. The lowest levels of mutations were found in the glands (P < 0·001 vs. skin, mucosa and muscle), and levels were second lowest in the skin (P = 0·023 vs. mucosa; P = 0·012 vs. muscle). The mutation frequencies in mucosa and muscle were the highest and showed no statistically significant difference (P = 0·92). CONCLUSIONS: In patients with PWM, GNAQ was mutated in all tissues except for glands. PWM is congenital, and all tissue layers exhibit primary hypertrophy rather than acquired or partially related hypertrophy. Given the advantages of mucosal biopsy, including practicality, lack of scarring and rapid healing, GNAQ mutation in the lip mucosa may be a useful predictor for early-stage PWM in patients with port-wine stains affecting the lips.

Treatment of Previously Treated Facial Capillary Malformations: Results of Single-Center Retrospective Objective 3-Dimensional Analysis of the Efficacy of Large Spot 532 nm Lasers.

BACKGROUND: Current treatment of facial capillary malformations (CM) has limited efficacy. OBJECTIVE: To assess the efficacy of large spot 532 nm lasers for the treatment of previously treated facial CM with the use of 3-dimensional (3D) image analysis. PATIENTS AND METHODS: Forty-three white patients aged 6 to 59 were included in this study. Patients had 3D photography performed before and after treatment with a 532 nm Nd:YAG laser with large spot and contact cooling. Objective analysis of percentage improvement based on 3D digital assessment of combined color and area improvement (global clearance effect [GCE]) were performed. RESULTS: The median maximal improvement achieved during the treatment (GCE) was 59.1%. The mean number of laser procedures required to achieve this improvement was 6.2 (range 1-16). Improvement of minimum 25% (GCE25) was achieved by 88.4% of patients, a minimum of 50% (GCE50) by 61.1%, a minimum of 75% (GCE75) by 25.6%, and a minimum of 90% (GCE90) by 4.6%. Patients previously treated with pulsed dye lasers had a significantly less response than those treated with other modalities (GCE 37.3% vs 61.8%, respectively). CONCLUSION: A large spot 532 nm laser is effective in previously treated patients with facial CM.

Free-style Capillary Perforator-Based Island Flaps for Reconstruction of Skin Cancer Defects of the Face, Body, and Extremities.

BACKGROUND: The perforator flap concept has revolutionized reconstructive surgery. Recently, the attention has moved toward flaps based on capillary perforators, which have been usually neglected in the past as reliable perforators. The aim of this article is to report a series of freestyle capillary perforator-based island flap (c-PBIF) for reconstruction of skin cancer defects of the face, body, and extremities. PATIENTS AND METHODS: Between September 2015 and July 2017, 20 consecutive patients underwent c-PBIF reconstruction of facial, body, and limb defects after melanoma and nonmelanoma skin cancer excision. Perforators were detected by means of unidirectional Doppler, and the flaps were designed taking into account the laxity of the surrounding skin in order to allow primary closure of the donor site. The mean defect dimension was 3.75 × 4.43 cm (ranging from 1 × 2 to 4.5 × 8 cm). All but 1 procedure was performed under local anesthesia. RESULTS: Mean flap size was 5.37 × 9.97 cm (ranging from 1 × 3 to 6 × 8 cm). In all cases, flaps were based on visible capillary perforators with a caliber of approximately 0.5 mm. All flaps survived. One minor tip flap necrosis was experienced in the largest flap of the series, which was successfully managed with dressing changes. The final reconstructive outcomes were satisfactory both for the patients and surgeons. CONCLUSIONS: Freestyle c-PBIF might represent a further method for local reconstruction of skin cancer defects of the face, body, and extremities, allowing a high tissue efficiency, reduced scarring, and expeditious reconstruction with pleasant outcomes. Further research is needed in order to explore the maximal perforasome potential of capillary perforators.

Active iris vascular tufts bleeding successfully treated with argon laser photocoagulation.

PURPOSE: Iris vascular tufts (IVT) are rare biomicroscopic capillary outgrowths from the pupillary margins. Patients are usually asymptomatic until presenting with blurred vision due to spontaneous hyphema or with raised intraocular pressure. CASE REPORT: A 61-year-old woman presented to eye casualty with left eye (LE) blurred vision and discomfort for 1 day. Her external ocular examination was unremarkable and visual acuity was 6/6 in the right eye (RE) and 6/9 in the LE. Biomicroscopic examination revealed a 2-mm hyphema in her LE and bilateral multiple small IVT and active bleeding from IVT at the pupillary margin of the LE at the 5 o'clock position. Diagnosis of LE active bleeding from IVT was made and she underwent argon laser photocoagulation directed at the source of bleeding. The bleeding stopped immediately after the second burn. She was followed up for 3 months; her visual acuity was 6/5 and 6/6 in the RE and LE, respectively, with no further problems. CONCLUSIONS: Iris vascular tufts are benign and recurrent hemorrhages are unlikely. Therefore, definitive argon laser photocoagulation or surgical treatment are reserved to arrest further episodes of hyphema. Our case demonstrates the effective use of argon laser photocoagulation to completely arrest active bleeding from IVT and excellent recovery of hyphema with no further problems for 5 years.

Capillary Malformations Treated With Sequential Pulsed Dye and Nd:YAG Laser Therapy: A Retrospective Study. / Malformaciones capilares tratadas con aplicación secuencial de láser de colorante pulsado y Nd:YAG: estudio retrospectivo.

INTRODUCTION AND OBJECTIVE: Capillary malformations are the most common vascular malformations in childhood. The current treatment of choice is pulsed dye laser (PDL) therapy, but this frequently does not result in complete resolution. The search for alternative treatment strategies thus continues. In this study we describe our experience with the use of sequential dual-wavelength PDL and Nd:YAG laser therapy in patients with capillary malformations. MATERIAL AND METHODS: We conducted a retrospective, descriptive study of patients with capillary malformations treated with dual-wavelength PDL and Nd:YAG laser therapy between 2006 and 2011. Four dermatologists rated the effectiveness of treatment on a scale of 10 to 0. We also investigated the potential value of the following factors as predictors of better treatment response: sex, malformation size and color, and presence of associated hypertrophy. Adverse effects were also analyzed. RESULTS: We studied 71 patients and most of them experienced a statistically significant improvement after treatment. More favorable responses were observed for violaceous malformations, lesions with associated hypertrophy, and smaller lesions. Adverse effects were reported for 26.76% of patients, and the most common effect was the appearance of isolated areas of skin atrophy. CONCLUSIONS: We consider that sequential dual-wavelength PDL and ND:YAG laser therapy is an effective alternative for treating capillary malformations in selected patients.

Three-dimensional imaging and analysis of entire peripheral nerves after repair and reconstruction.

BACKGROUND: We wanted to achieve a three-dimensional (3D), non-destructive imaging and automatic post-analysis and evaluation of reconstructed peripheral nerves without involving cutting and staining processes. NEW METHOD: We used a laboratory-based micro computed tomography system for imaging, as well as a custom analysis protocol. The sample preparation was also adapted in order to achieve 3D images with true micrometer resolution and suitable contrast. RESULTS: Analysis of the acquired tomograms enabled the quantitative assessment of 3D tissue structures, i.e., surface morphology, nerve fascicles, nerve tissue volume, geometry, and vascular regrowth. The resulting data showed significant differences between operated animals and non-operated controls. COMPARISON WITH EXISTING METHODS: Our approach avoids the sampling error associated with conventional 2D visualization approaches and holds promise for automation of the analysis of large series of datasets. CONCLUSIONS: We have presented a potential way for 3D imaging and analysis of entire regenerated nerves non-destructively, paving the way for high-throughput analysis of therapeutic conditions of treating adult nerve injuries.

Anomalías vasculares de presentación neonatal / Vascular anomalies in the neonatal period

Objetivos. Las anomalías vasculares de presentación neonatal suponen un reto diagnóstico por la ausencia de semiología florida, de historia evolutiva y la conveniencia de restringir pruebas diagnósticas agresivas. El objetivo es revisar las características de los casos neo- natales presentados a nuestra Unidad de Anomalías Vasculares en los últimos 5 años. Material y métodos. Se recogen todos los casos de sospecha de anomalía vascular presentados a nuestra Unidad antes de 1 mes de edad entre 2010 y 2015. Se revisa el momento del diagnóstico en relación con la anomalía, las pruebas diagnósticas y los tratamientos efectuados con su cronología. Se comparan el diagnóstico de presunción y el de certeza, cuando lo hay. Resultados. Se incluyen 26 pacientes: 15 tumores vasculares, 2 de ellos con afectación visceral (6 hemangiomas infantiles (HI), 3 NICH, 4 RICH, 1 hemangioma en penacho, 1 tumor vascular hepático no especificado. 3 malformaciones venosas: 2 con RM equívoca y una malformación venosa hiperqueratótica. 4 malformaciones linfáticas: 3 macroquísticas y una microquística. 2 lesiones muy vasculares que se diagnosticaron posteriormente (fibrosarcoma y adiponecrosis) y no eran anomalías vasculares. Solo 3 pacientes tenían diagnóstico prenatal, las malformaciones linfáticas macroquísticas. Conclusión. El diagnóstico preciso de las anomalías vasculares durante el primer mes de vida es difícil, incluso con RM. En pocos casos se necesita un tratamiento precoz, por lo que conviene dar tiempo a la evolución, al menos durante unas semanas. Los diferentes tipos de tratamiento (observación, propranolol, biopsia, láser, embolización, exéresis) dependerán de la patología a tratar. Una observación continuada puede evitar procedimientos y riesgos innecesarios (AU)

Objective. Vascular anomalies in the neonatal period are a diagnostic challenge for the lack of evident signs, symptoms and follow-up, and the convenience of restricting aggressive diagnostic tests. The aim of this work is to review the characteristics of neonatal cases presented to our Vascular Anomalies Unit in the last 5 years. Materials and methods. All cases of suspected vascular anomaly presented to our unit before 1 month of age between 2010 and 2015 were reviewed, diagnostic tests and treatments carried out with chronology were analyzed. Presumptive diagnosis and final diagnosis (when available) were compared. Results. Fifteen vascular tumors were found, 2 with visceral involvement: 6 infantile hemangiomas (IH), 3 NICH, 4 RICH, 1 tufted hemangioma, 1 unspecified liver vascular tumor, 3 venous malformations (2 equivocal MRI and a hyperkeratotic venous malformation), 4 lymphatic malformations, 3 of them macrocystic, and 2 vascular lesions that were diagnosed of fibrosarcoma and sclerema neonatorum and they were not vascular anomalies. Only 3 patients with macrocystic lymphatic malformations had prenatal diagnosis. Conclusion. Accurate diagnosis of vascular anomalies during the first month of life is difficult, even with MRI. Only in a few cases early treatment is needed, so it is worth taking time to follow-up. Different types of treatment (observation, propranolol, biopsy, laser, embolization, and resection) will depend on the condition to be treated. A continuous observation can avoid unnecessary procedures and risks (AU)

Congenital capillary proliferation of the kidney: a distinctive renal vascular lesion of childhood.

Renal vascular lesions (RVL) are rare, and their morphological spectrum remains largely unknown, particularly in children. In this study, we characterize the clinicopathological features of RVL in a cohort of 12 children. Seven lesions were classified as previously recognized entities: vascular malformations (4), papillary endothelial hyperplasia (2), and pyogenic granuloma (lobular capillary hemangioma; 1). An eighth lesion showed nonspecific findings, which were interpreted as reactive during our review. The remaining 4 cases presented either prenatally, at birth, or shortly after birth and were morphologically similar. These were characterized by a peculiar pattern of capillary proliferation with entrapment of native renal structures, variable amounts of extramedullary hematopoiesis and reactive lymphocytes, foci of infarction and hemorrhage, and the presence of feeding and draining vessels at their periphery. To our knowledge, this represents a previously undescribed congenital vascular lesion involving the kidney, which we have descriptively and provisionally termed congenital capillary proliferation of the kidney (CCPK). While it is unclear whether CCPK represents a malformation or neoplastic proliferation, it shows overlapping features with congenital hemangioma of the liver (solitary congenital hepatic hemangioma) and congenital nonprogressive hemangioma (CNH) of the skin and soft tissue, suggesting a possible common pathogenesis among these 3 entities.

Retrospective single center study of the efficacy of large spot 532 nm laser for the treatment of facial capillary malformations in 44 patients with the use of three-dimensional image analysis.

OBJECTIVE: We wanted to asses the efficacy of large spot 532 nm laser for the treatment of facial capillary malformations with the use of three-dimensional (3D) image analysis. STUDY DESIGN AND METHODS: Retrospective single center study on previously non-treated patients with facial capillary malformations (CM) was performed. A total of 44 consecutive Caucasian patients aged 5-66 were included. Patients had 3D photography performed before and after and had at least one single session of treatment with 532 nm neodymium-doped yttrium aluminum garnet (Nd:YAG) laser with contact cooling, fluencies ranging from 8 to 11.5 J/cm2 , pulse duration ranging from 5 to 9 milliseconds and spot size ranging from 5 to 10 mm. Objective analysis of percentage improvement based on 3D digital assessment of combined color and area improvement (global clearance effect [GCE]) were performed. RESULTS: Median maximal improvement achieved during the treatment (GCEmax ) was 70.4%. Mean number of laser procedures required to achieve this improvement was 7.1 (ranging from 2 to 14)). Improvement of minimum 25% (GCE 25) was achieved by all patients, of minimum 50% (GCE 50) by 77.3%, of minimum 75% (GCE 75) by 38.6%, and of minimum 90% (GCE 90) by 13.64. CONCLUSION: Large spot 532 nm laser is highly effective in the treatment of facial CM. 3D color and area image analysis provides an objective method to compare different methods of facial CM treatment in future studies. Lasers Surg. Med. 49:743-749, 2017. © 2017 Wiley Periodicals, Inc.

Indocyanine-green-guided targeted laser photocoagulation of capillary macroaneurysms in macular oedema: a pilot study.

AIMS: In longstanding diabetic macular oedema (DME) or retinal vein occlusion (RVO), capillary macroaneurysms may develop. Indocyanine green angiography (ICGA) has been shown to optimise their detection. Here, we report the anatomical and functional outcome of the elective photocoagulation of capillary macroaneurysms. METHODS: A retrospective, interventional, two-centre study. In eyes with chronic macular oedema and severe hard exsudates due to diabetic retinopathy or RVO, the presence of capillary macroaneurysms (defined by a diameter larger than 150 µm) was assessed by ICGA and optical coherence tomography (OCT). Capillary macroaneurysms were selectively photocoagulated, the presence of photothrombosis within the lumen being assessed by immediate OCT. RESULTS: Four eyes from three patients with DME and five eyes from five patients with RVO were included. The median duration of visual loss was 4 years. Median initial visual acuity (VA) was 20/200. The median number of capillary macroaneurysms per eye was 2 (range, 1-8) and their median size was 410 µm (range, 154-603). Six months after photocoagulation, there was a significant reduction in macular thickness (mean±SD, 528 µm±200 vs 271 µm±152, p<0.05) and improvement of VA (mean log MAR, 0.82 vs 0.58, p<0.05). CONCLUSIONS: During macular oedema with severe hard exsudates due to DME or RVO, systematic detection of capillary macroaneurysms by ICGA followed by their OCT-controlled photocoagulation may be of interest. These results may contribute to re-evaluate the role of photocoagulation in the management of longstanding macular oedema.

A Computational Model of Peripheral Photocoagulation for the Prevention of Progressive Diabetic Capillary Occlusion.

We developed a computational model of the propagation of retinal ischemia in diabetic retinopathy and analyzed the consequences of various patterns and sizes of burns in peripheral retinal photocoagulation. The model addresses retinal ischemia as a phenomenon of adverse local feedback in which once a capillary is occluded there is an elevated probability of occlusion of adjacent capillaries resulting in enlarging areas of retinal ischemia as is commonly seen clinically. Retinal burns of different sizes and patterns, treated as local oxygen sources, are predicted to have different effects on the propagation of retinal ischemia. The patterns of retinal burns are optimized with regard to minimization of the sum of the photocoagulated retina and computer predicted ischemic retina. Our simulations show that certain patterns of retinal burns are effective at preventing the spatial spread of ischemia by creating oxygenated boundaries across which the ischemia does not propagate. This model makes no statement about current PRP treatment of avascular peripheral retina and notes that the usual spot sizes used in PRP will not prevent ischemic propagation in still vascularized retinal areas. The model seems to show that a properly patterned laser treatment of still vascularized peripheral retina may be able to prevent or at least constrain the propagation of diabetic retinal ischemia in those retinal areas with intact capillaries.