[Malignant recurrence of "mature" XXXX . A clinicopathological study of 4 cases].

@entity5 @entity1 @entity160 @entity44
@entity44 ( @entity44 ) are uncommon @entity5 which are usually benign. Our interest was aroused by encountering @entity1 with reportedly benign @entity44 which later, after surgery, recurred as @entity5 . We conducted a retrospective study of 17 @entity1 treated for benign @entity44 during a period of 9 years. Of these @entity1 , 4 developed malignant recurrence (3 females and 1 male) with a mean age of 19 months. The average time to recurrence was 17 months. Recurrence presented as a gluteal mass in one case, urinary and digestive compression signs in another case and as elevated @entity160 levels in the two remaining cases. Histologically, one of the original @entity5 included tiny immature foci but none contained a malignant component after reading slides. Recurrences were as @entity5 in all cases. After surgery and adjuvant chemotherapy, only one @entity1 died from complications related to chemotherapy. The other three were alive and well at mean follow-up of 5 years. These results emphasise the need for close clinical and biological follow-up for at least 2 years in all @entity1 who had undergone excision of a neonatal @entity44 .
