Dataset Information

Corneal melt following corneal tattooing with carbon-based ink.

ABSTRACT:

Purpose

to report a case of corneal melting following corneal tattooing with carbon-based ink.

Observations

A 67 year old female with a phthisical eye underwent corneal tattooing with carbon-based ink for purpose of cosmesis. The procedure was uncomplicated. At 8 weeks postoperatively, she presented with almost complete corneal melt with uveal prolapse. There was no evidence of infection. The patient underwent evisceration. Histopathologic examination of the excised corneal button showed melting of the epithelium and anterior stromal layers, diffuse inflammation of the deeper stromal layers, and disorganized Descemet membrane and endothelium with adherent iris tissue.

Conclusions and importance

Corneal melting can occur as a rare complication of corneal tattooing with carbon-based ink.

SUBMITTER: Bromeo AJ

PROVIDER: S-EPMC7315104 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Corneal melt following corneal tattooing with carbon-based ink.

Bromeo Albert John AJ Lim Bon Siong Ruben R

American journal of ophthalmology case reports 20200610

<h4>Purpose</h4>to report a case of corneal melting following corneal tattooing with carbon-based ink.<h4>Observations</h4>A 67 year old female with a phthisical eye underwent corneal tattooing with carbon-based ink for purpose of cosmesis. The procedure was uncomplicated. At 8 weeks postoperatively, she presented with almost complete corneal melt with uveal prolapse. There was no evidence of infection. The patient underwent evisceration. Histopathologic examination of the excised corneal button ...[more]

PMID: 32613136

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Project description:PurposeReport a case of corneal melt in a patient with conjunctival intraepithelial neoplasia (CIN) treated with topical interferon (IFN) alpha-2B.ObservationsAn 89-year-old man presented with gelatinous paralimbal lesions of the left eye extending onto the cornea with corneal neovascularization extending 5-6 clock hours. Nasally there was mild absence of the terminal vascular loops of the limbal palisades of Vogt and conjunctivalization. Diffuse punctate epithelial erosions were noted. The corneal graft displayed subepithelial and stromal edema. Anterior segment optical coherence tomography detected hyperreflectivity, sectional thickened epithelium, and abrupt transitions from normal to abnormal tissue. The patient was treated with excision of the corneal and conjunctival lesions with cryotherapy to the conjunctival borders. Excisional biopsy revealed CIN Grade 3 and carcinoma in situ of the cornea. Topical IFN alpha-2B four times daily was initiated postoperatively. Two months later, a central epithelial defect developed. The cornea progressively thinned and corneal melt ensued. The patient had several risk factors for corneal melt including neurotrophic cornea, early limbal stem cell deficiency, history of cryotherapy, keratoconjunctivitis sicca, and chronic use of glaucoma medications and steroid medications.ConclusionsInterferon alpha-2B is an effective first line treatment for CIN with few side effects. It's side effects include punctate epithelial erosions, conjunctival hyperemia, and follicular conjunctivitis. We report a case of pre-existing keratoconjunctivitis sicca, early limbal stem cell deficiency, neurotrophic cornea, and newly diagnosed CIN Grade 3; it was treated with surgical excision, cryotherapy, and topical IFN alpha-2b with development of corneal melt 2 months later. Caution should be taken when using interferon alpha -2b in patients with pre-existing keratoconjunctivitis sicca, neurotrophic cornea, or limbal stem cell deficiency as it could exacerbate these conditions resulting in corneal melt.

Project description:A cutting-edge method that uses electromagnetic (EM) energy for the melt processing of thermoplastic polymer nanocomposites (TPNCs) is reported. The properties and microstructures of TPNCs produced via the proposed EM-processing method and TPNCs via conventional heat processing are contrasted. The EM-processed TPNCs prepared with EM-susceptible carbon nanotubes (CNTs) exhibited a significant enhancement in transport and mechanical properties, outperforming the conventionally processed TPNCs. Thus, the EM-processed TPNCs demonstrated an ultralow electrical percolation threshold (∼0.09 vol %) and a remarkable increase in volume electrical conductivity of 8 orders of magnitude (i.e., 1.1 × 10-5 S/m) at only 1.0 wt % CNT loading, compared to their hot-pressed counterparts. This highlights the superior network formation, level of segregation, and structuring enabled by EM processing. Differential scanning calorimetry (DSC) and X-ray diffraction (XRD) revealed that EM-processed TPNCs exhibited higher crystallinity (∼9% higher) and a predominantly α crystal phase compared to the hot-pressed TPNCs. Microstructural inspection by electron microscopy disclosed that EM processing led to segregated but interconnected multiscale networks of a thin and well-defined CNT interphase that encompassed from the nanoscale of the CNTs to the macroscopic scale of TPNCs. In contrast, conventional processing developed a more diffused CNT interphase with less interconnectivity. The EM-processed TPNCs developed a statistically higher stiffness (+20%) and in certain cases, even better strength (+10%) than the hot-pressed TPNCs. However, the EM-processed TPNCs displayed significantly lower ductility, owing to their higher crystallinity, more brittle crystal α phase, and the potential formation of microvoids in the bulk of the TPNCs inherent to the unoptimized EM processing. This work provides an understanding of an alternative and unconventional processing method capable of achieving higher structuring in nanocomposites with advanced multifunctional properties.

Dataset Information

Corneal melt following corneal tattooing with carbon-based ink.

Purpose

Observations

Conclusions and importance

Publications

Corneal melt following corneal tattooing with carbon-based ink.

Similar Datasets

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