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Cerebrospinal fluid (CSF) leak can occur immediately or several years after traumatic skull base injury which may present merely as a CSF leak or may even present with recurrent meningitis. Around 2% of all cases of head trauma, and 12%–30% of all basilar skull fractures may develop CSF leak. Posttraumatic CSF rhinorrhoea usually occurs within the first 48 hours, and the majority of them occur in the first 3 months, whereas delayed CSF leak beyond 3 months is rare. We encountered two such cases of delayed post-traumatic CSF rhinorrhoea about a decade after the head injury. We have reviewed and discussed previous studies on delayed post-traumatic CSF rhinorrhoea which have shown CSF leaks occur after months, years, or even after trauma. Such cases may help clinicians to be aware of the possibility of delayed CSF rhinorrhoea which may occur years after traumatic head injury.

Metal halide Pb-based and Pb-free perovskite crystal structures are an essential class of optoelectronic materials due to their significant optoelectronic properties, optical absorption and tuneable emission spectrum properties. However, the most efficient optoelectronic devices were based on the Pb as a monovalent cation, but its toxicity is a significant hurdle for commercial device applications. Thus, replacing the toxic Pb with Pb-free alternatives (such as tin (Sn)) for diverse photovoltaic and optoelectronic applications is essential. Moreover, replacing the volatile methylammonium (MA) with cesium (Cs) leads to the development of an efficient perovskite absorber layer with improved optical & thermal stability and stabilized photoconversion efficiency. This paper discusses the correlation between the experimental and theoretical work for the Pb-based and Pb-free perovskites synthesised using the hot-injection method at different temperatures. Here, simulation is also carried out using the help of SCAPS-1D software to study the effect of various parameters of CsSnI3 and CsPbI3 layers on solar cell performance. This experimental and theoretical comparative study of the Hot-injection method synthesised CsPbI3 and CsSnI3 perovskites is rarely investigated for optoelectronic applications.