Multiple endocrine neoplasia type 2B: more than an endocrine disorder

Surgery
D S O'RiordainJ A van Heerden

Abstract

Multiple endocrine neoplasia type 2B (MEN 2B) is a rare disorder differentiated from MEN 2A primarily by its extraendocrine features. This report describes the clinical spectrum and outcome of MEN 2B. Twenty-one patients underwent operation for manifestations of MEN 2B between 1970 and 1993. Median follow-up was 16.9 years. Diagnosis was made through family screening in nine, the development of medullary thyroid carcinoma (MTC) in seven, phenotypic features in four, and constipation in one. Median age at presentation of colonic dysfunction, MTC, and pheochromocytoma was 0.1, 16, and 28 years, respectively. Every patient had MTC. Fifteen (94%) of 16 patients undergoing primary thyroidectomies had multicentric disease, and seven (44%) had nodal metastases. Seven patients (33%) had pheochromocytoma, six bilateral and one malignant. Adrenalectomy was curative in every patient. Nineteen patients (90%) had colonic disturbances, typically chronic constipation from birth. Megacolon developed in 14 patients, and eight required colonic surgery. Every patient had the characteristic phenotype. Dominant features included neuromas of the tongue, buccal mucosa, lips, conjunctivae, and eyelids and a marfanoid habitus. Other features included h...Continue Reading

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