We found that his lymphocytes had a normal number of chromosomes, half of them being either 46,XX or 46,XY. Because this pattern of pigmentation might be related to mosaicism, we determined his karyotype. It was not possible to ascertain by means of clinical examination of the patient, his parents, and his brother which of the 2 shades was his normal skin color. He also had 2 lighter Blaschko-linear bands on the lower extremities and an indefinable mixture of lighter and darker skin on the back and the lateral part of the trunk. On examination, we found a disorder of the skin pigmentation that was difficult to categorize there was a lighter-appearing skin patch in the median frontal area and also on one-half of the abdominal area, with a sharp midline demarcation. Observations The boy had no remarkable previous medical history, and he had normal intelligence and development. We report the case of a 6-year-old boy whose skin pigmentary abnormalities revealed chimerism. Shared Decision Making and Communicationīackground Chimerism, especially in the absence of sexual ambiguity, is extremely rare in humans.Scientific Discovery and the Future of Medicine.Health Care Economics, Insurance, Payment.Clinical Implications of Basic Neuroscience.Challenges in Clinical Electrocardiography.
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