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In a discovery that may lead to the first practical test for Alzheimer's disease, a protein linked to the disease has been located outside the brain

''We have unequivocal evidence of deposition of the amyloid'' in certain tissues, Dr. [Dennis J. Selkoe] said in an interview, adding, ''But we don't know that it is everywhere in the body.'' Dr. Selkoe's team studied tissues from 41 individuals, of whom 11 had Alzheimer's disease, four had Down's syndrome, which carries with it a higher risk for Alzheimer's disease, and 26 did not have either condition. Eight of the 11 with Alzheimer's had definite evidence of the amyloid protein in tissues other than the brain and two had equivocal evidence. Of the four with Down's syndrome, the protein was definitely found in two and its presence was indicated in the other two. Of the 26 who did not have Alzheimer's or Down's syndrome, the protein was found in three, and all were 77 or older

Dr. [Charles S. Hirsch] said he also relied on witnesses' accounts of the struggle to determine what type of trauma caused the cuts and bruises he found. Mr. [Henry Hughes]'s wounds were ''consistent with'' descriptions of the impact of a nightstick or a blunt instrument, Dr. Hirsch said last week. Dr. Hirsch considered whether pressure applied in the struggle, say from a choke hold, killed Mr. Hughes by blocking blood to the brain. But Dr. Hirsch said the absence of damage to tissues in the neck, brain and other areas led him to conclude that ''physical injuries neither caused nor contributed to'' the death. Mr. Hughes's family hired Dr. Stuart Dawson, deputy medical examiner of Suffolk County on Long Island. In criticizing Dr. Hirsch's findings, Dr. Dawson said that even if the police did not fatally beat Mr. Hughes, the struggle could have contributed to his death. Dr. Dawson is reviewing the entire investigation. While witnesses are usually crucial, they sometimes can present obstacles

Completely satisfied with his recuperation, doctors are expected to release former President Ronald Reagan from a Minnesota hospital following surgery to drain a blood clot from the right side of his brain

Former President Ronald Reagan has an increased risk of suffering another blood clot on his brain like the two he has already, one of which was removed on Sep 8, 1989

After doctors removed the blood clot from former President Reagan's brain, a result of a horseback riding accident, they discovered evidence of another blood clot that occurred earlier but which healed on its own

The blood clot removed from former President [Reagan]'s brain Friday was the second that he suffered since his horseback accident two months ago, Reagan's neurosurgeon said Sunday. Weinberg has said the former president suffered no symptoms from the clot detected at the Mayo Clinic. Asked whether Reagan had suffered any symptoms that led to the detection of the first clot, [Thoralf M. Sundt] declined to comment. Weinberg said the Mayo doctors have attributed Reagan's clot to the riding accident. Immediately after the accident on a ranch owned by William Wilson, Reagan's first ambassador to the Vatican, the former president was flown to Raymond W. Bliss Army Community Hospital at Fort Huachuca in southern Arizona. He was released after declining to stay overnight for observation as doctors had suggested

Former President Ronald Reagan was reported to be making a 'rapid recovery' one day after minor surgery to drain blood that formed on his brain

''President [Ronald Reagan] was found to have a small collection of fluid on top of the right side of his brain,'' Mr. [Mark Weinberg] said in a statement before the surgery. ''Although President Reagan has not experienced any symptoms, physicians have advised this fluid be removed in a routine procedure.'' President Bush told reporters he tried to telephone Mr. Reagan from Air Force One as he flew to New Orleans today but the former President had already gone into surgery, The Associated Press reported. ''I hope it's all right, pray it's all right,'' Mr. Bush said. Dr. James I. Ausman, the chief neurosurgeon at Henry Ford Hospital in Detroit, who is not connected with Mr. Reagan's case, said it was ''a judgment call'' whether to operate on brain hematomas that cause no symptoms. One factor is the amount of fluid on the brain. Another is whether the fluid has pushed on the brain to cause significant pressure or even displacement

Ronald Reagan underwent surgery to remove fluid from his brain on Sep 8, 1989