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An important though uncommon complication of retained missiles is that of spontaneous migration. A 22 years young man presented to us with alleged firearm injury to head. The bullet migration was evident on the third day after injury when it was seen lying in the left posterior occipital region as compared to previous posterior frontal location. Softening of contused cerebrum along the missile tract and free weight of the bullet due to gravity were probably responsible for the bullet migration in this case. The patient underwent surgical exploration and progressively recovered. This case report emphasizes the fact that spontaneous migration of a foreign body in side the cranium should be watched for, resulting in damage to vital structures producing significant neurological damage. The presence of migration should be considered to be an urgent indication for surgical intervention.

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Output of SRAM memory circuit is very small i.e. in few milli volts. While reading logic 1 sometimes it is read as logic 0. Due to this malfunctioning of circuit, problem of hazards occur. To overcome this problem we use sense amplifiers. The work of sense amplifier is to sense low power signal from bit line of SRAM memory circuit and amplify the small voltage swing to recognizable logic levels so that data can be interpreted clearly by logic outside the memory. Here we have reduced the delay of the sense amplifier by optimizing the supply voltage i.e. VDD. For this purpose tradeoff between delays, VDD and offset voltage has been done. We have examined the results using IC flow tool.