Laryngotracheal invasion by well-differentiated thyroid carcinoma is an uncommon occurrence. Recommendations for therapy have primarily included total laryngectomy or shaving of the tumor from laryngeal or tracheal cartilages. Clear guidelines have not been established for the applicability of partial laryngeal resections. In a retrospective analysis of patients with thyroid carcinoma, 13 patients had airway invasion. Of the five patients with laryngeal involvement, three were treated by a partial laryngeal resection. An experimental study was undertaken to determine more precisely the amount of cricoid cartilage which could be resected without reconstruction. Varying amounts of cricoid cartilage were resected. The results indicate that 25 % of the cricoid cartilage may be resected without appreciable airway narrowing. On the basis of the retrospective analysis and experimental study, we feel a partial laryngeal resection is possible in most cases of airway invasion by thyroid carcinoma.
We have studied the hormonal secretion and excretion patterns in a patient with the XX type of 17\g=a\-hydroxylasedeficiency. In the untreated state, the patient's urine contained only those steroids which do not require 17-hydroxylation in their biosynthesis. Aldosterone was not produced in the patient and the metabolic product of its immediate precursor, 18-hydroxy-11-dehydro-tetrahydrocorticosterone, was excreted in markedly elevated amounts. This apparent complete block in 18 oxidation was reversible upon long-term ACTH suppression within 27 days. Direct in vitro incubation of the patient's adrenal gland removed at operation demonstrated, 1) the complete lack of 17\g=a\-hydroxylaseactivity, 2) the functional block in the ability to oxidize the hydroxyl group at the 18 methyl side chain. The addition of physiological concentrations of angiotensin to the incubation medium further showed, 3) angiotensin mildly stimulated the entire aldosterone biosynthetic pathway, 4) angiotensin directly stimulated the conversion of 18-hydroxycorticosterone to aldosterone.O Deceased.
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