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Invasive pituitary adenomas with gross total resection: The wait-and-see policy during postoperative management.
Journal of Clinical Neuroscience : Official Journal of the Neurosurgical Society of Australasia 2018 December
Although pituitary adenomas (PAs) are regarded as benign neoplasm, efficient postoperative management of PAs, especially invasive PAs, is still a major challenge for neurosurgeons. Thus, in order to verify the effect of postoperative surveillance alone for invasive PAs and identify helpful predictive factors of relapse after initial surgery, a series of 107 cases of surgically gross-totally resected invasive PAs were retrospectively investigated. With regarded to pituitary function, the preoperative incidence of hypothyroidism was higher than that of hypoadrenocorticism and hypogonadism (66.4% vs. 31.8% and 29.9%; p < 0.001). Tumors extended into sphenoid sinus or cavernous sinus may be less likely to develop hypoadrenocorticism or hypogonadism. Postoperative relapse was found in 35 cases (32.7%) during a median follow-up of 27 months. The overall relapse rates were 12.3, 28.9 and 38.4% at 1, 3 and 5 years, respectively. Tumor size was the exclusive independent risk factor for relapse. Higher relapse rates presented in large invasive PAs (more than 3.45 cm) were 24.5, 48.9 and 59.2% at 1, 3 and 5 years, respectively. In conclusion, preoperative larger tumors shared significantly higher risk of relapse after initial surgical total resection. Due to the relatively high relapse rate, close surveillance should be executed in strict rotation in postoperative management of gross-totally resected invasive PAs. Moreover, special attention should be payed to tumors with diameter of more than 3.45 cm for more than half of them relapsed in 5 years.
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