[Chromosome X with partial long arm deletion. Three cases].

X deletions result generally in one or many features characteristic of Turner syndrome but each feature cannot be attribute to a well defined deletion. We present 3 cases of Xq partial deletion: 2 in girls with primary amenorrhea and normal stature, 1 in a patient with secondary amenorrhea and short stature. X inactivation is a complex phenomenon, the mechanism is not yet clear. Inactivation center(s) and active genes on inactive chromosome could explain the manifestation or the absence of clinical symptoms in X deletions.