POLYTHELIA WITHIN BECKERS NEVUS

We report a case of accessory mammary tissue of type 2a (or polythelia ) entirely localized within a Becker's naevus of mixed type in a 32-ye ar-old Caucasian woman. Polythelia was congenital in origin while Beck er's naevus appeared during puberty. Renal ultrasonographic studies, l aboratory examinations and other instrumental investigations were eith er normal or negative. Although the association of accessory mammary t issue with Becker's naevus has previously been reported - also in the form of mammorenal and acromammorenal syndromes - this is the first ca se characterized by an anatomic overlap between the two anomalies. It may be the expression of a common disturbance acting early in embryoge nesis in the specific developmental fields involved.