Bone pearl appearance is seen in -

Ans. is 'a' i.e., Electrical burnsElectric burnso Electric bums are at times, also referred to as joule burns. Technically, joule bum is an endogenous bum, i.e. bums produced due to release of heat from the body, on application of electric current. Electric bums may be of following typesContact burns : Due to contact with live wire.Spark burns : Due to sparking of current, e.g. in loose electrical fitting.Flash burns : Caused on being near the main powrer line, without actual contact. Bums result due to arcing of current from these lines.o Characteristic features of electric burns areThere may be holes in clothes or shoes.There is a wound of entry and wound of exit of electric currentEntry wound : It is non-bleeding, thick, leathery, greyish white, depressed, hard and cauliflower like, known as crater formation. High voltage current may cause bums over large areas of skin, i.e. crocodile skin lesions. The skin may get coloured due to metallic pigment: green (in brass electrode), black (in iron electrode), blue (in copper electrode) and grey (in aluminium electrode),Exit wound : It is like a laceration and is bleeding.Metals from electrode may melt and as small balls (current pearls) may be carried to tissue. Calcium phosphate of bones may also melt and is radiologically seen as bone pearls (wax dripping).Muscles show Zenker's degeneration.Causes of deatho Commonest cause of death is ventricular fibrillation. Other causes include shock, cardiopulmonary arrest, cerebral anoxia, paralysis of respiratory muscles, and mechanical injuries due to fall.