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Pituitary adenomas in childhood and adolescence. Results of transsphenoidal surgery.
Journal of Neurosurgery 1994 Februrary
Pituitary adenomas are uncommon in childhood. Between 1975 and 1988, 36 patients underwent transsphenoidal resection at the Mayo Clinic before their 17th birthday. Fifteen (41.7%) had prolactin (PRL)-secreting tumors, 16 (44.4%) had adrenocorticotropic hormone (ACTH)-secreting tumors (including two patients with Nelson-Salassa syndrome), and three (8.3%) had tumors secreting growth hormone (GH); two patients (5.6%) had clinically nonfunctioning tumors. Of the 36 patients, 21 (58.3%) were girls, and girls predominated in every group except that with ACTH-secreting tumors, where they accounted for only 37.5% of the patients. The average age at the time of surgery was 14.7 +/- 2.2 years, the youngest patient being 7.3 years old. The ACTH-secreting tumors were associated with an earlier onset of symptoms than the other tumor types: six (37.5%) of 16 patients became symptomatic before 10 years of age, compared with two (10.0%) of the 20 other patients. Presenting symptoms primarily reflected endocrine dysfunction, with neurological presentation (visual field deficits) occurring in only two patients. There were no deaths in this patient group. Significant operative morbidity included steroid-induced psychosis in one patient and diabetes insipidus in three, which resolved in two. Plurihormonal tumors, broadly defined as tumors producing more than one hormone, were common, comprising five (36%) of 14 PRL-secreting tumors, all three GH-secreting tumors, and one of two clinically nonfunctioning tumors, or 25.7% overall. Macroadenomas accounted for 89% of plurihormonal tumors. Long-term follow-up review (median > 5 years) revealed good control of PRL-secreting tumors (although five of 15 patients had received postoperative radiotherapy), contrasted with a 25% late recurrence rate for ACTH-secreting tumors, which had an 80% initial remission rate. The majority of patients had good endocrine function, including reproductive function. It is concluded that: 1) although pediatric pituitary adenomas occur primarily in adolescence, Cushing's disease is found at any age; 2) transsphenoidal surgery is feasible and safe in this age group; 3) plurihormonal tumors occur more frequently in the pediatric age group than in adults; and 4) long-term control rates in PRL- and ACTH-secreting tumors are probably similar to those seen in adults.
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