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Endocrine Abstracts (2010) 22 P248

1Department of Endocrinology, Diabetes and Rheumatology, University Hospital Duesseldorf, Duesseldorf, Germany; 2Praxis für Humangenetik-Altona, Hamburg, Germany; 3Department of Neurosurgery, Section of Pituitary Surgery, University Clinic of Hamburg, Hamburg, Germany; 4Institute of Pathology of the Marienkrankenhaus Hamburg, Hamburg, Germany; 5Endocrine outpatient clinic, Duesseldorf, Germany.

Autonomy of ACTH secretion has been described in patients with chronic dysinhibition of ACTH secretion. We here present the very unusual case of a 31-year old female patient who had congenital adrenal hyperplasia and developed Cushing’s disease, including clinical examinations, laboratory data, endocrine function tests, histological and genetic analyses.

The affected patient had clinical signs and a typical history of hypercortisolism. Endocrine function tests revealed Cushing’s disease. After removal of a pituitary microadenoma, serum-cortisol levels fell below normal and the symptoms improved. However, hirsutism returned after four years ACTH levels were in the upper range of normal. An ACTH challenge test showed a minor cortisol response but a marked increase in 17-hydroxyprogesterone serum concentrations. The genetic analysis revealed a homozygous mutation in exon 7 of the CYP21A2 gene (CTG>TTG, Val281Leu).

This is the third description of a case of Cushing’s disease with congenital adrenal hyperplasia. It is suggested that a marked ACTH drive can override insufficient 21-hydroxylation causing hypercortisolism in non-classical homozygous forms of congenital adrenal hyperplasia. In this patient Cushing’s disease may have developed on the basis of impaired 21-hydroxylation in the sense of tertiary hypercorticotropinism.

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