We report two patients with multiple agminate Spitz naevi (MASM), a ra
re disorder. In case 1, a 16-year-old girl, the results of chromosomal
investigation of fibroblasts from the affected area (translocation 45
, X, t(4; 7) (p14; p22) in a mosaic pattern) suggest that early during
embryogenesis a de novo reciprocal translocation has occurred between
chromosomes 4 and 7. This resulted in the skin lesions as described o
n the right shoulder, arm and hand. The melanoma risk in MASM is also
discussed. (C) 1998 Lippincott-Raven Publishers.