8528 An Unusual Case Of Adrenal Hemorrhage As An Initial Manifestation Of Castleman Disease In A 29 yo Male With Unsuspected Late-Onset Congenital Adrenal Hyperplasia

Abstract Disclosure: L.M. Martel: None. F. Mercier: None. S. Parisien-La Salle: None. A. Lacroix: None. A. Liberman: None. N. Bettache: None. H. Olney: None. I. Bourdeau: None. Background: Castleman disease is a lymphoproliferative disorder with no clear etiology. We report the case of a 29 yo man presenting with an adrenal hemorrhage as initial manifestation of Castleman disease and unsuspected late-onset congenital adrenal hyperplasia. Clinical case: A 29-year-old male with no significant past medical history except for unilateral orchiectomy at 1 year-old for a possible testicular mass was referred to our adrenal clinic for a 6,2x7,5 cm left adrenal mass showing at CT scan necrosis and an hemorrhagic component (HU52). The patient presented initially with acute left abdominal pain. The adrenal mass showed at peripheral high uptake at PET-FDG (SUVmax 5,3) with no central uptake. His physical exam was unremarkable except for obesity. The hormonal work-up for the adrenal mass revealed normal metanephrines, and normal 1mg-dexamethasone suppression test with morning cortisol of 18 nmol/L (N<50). Further hormonal investigations based on the high adrenal mass uptake and possible adrenocortical carcinoma included: 17-OH Progesterone: 7.7 nmol/L (N:1.1-7.0), Androstenedione: 14.1 nmol/L (N: 1.5-9.0), Testosterone: 11.3 nmol/L (N: 9.0-28.3) and DHEAS: 3.6 umol/L (2.3-18.7). The ACTH levels were increased at 21.2 pmol/L (N:2-11) with morning cortisol of 220 nmol/L. During the consultation, the patient reported a pleuritic chest pain and underwent an urgent CT pulmonary angiography showing a pulmonary embolism with lung infarction in addition to mediastinal lymphadenopathy (biopsy negative) and a mass in his thymus. He underwent thymectomy and the pathology report described Castleman disease (hyaline vascular type). Taking into account the increased level of 17-OH progesterone, we performed an ACTH stimulation test (250 mcg) that showed an increase of cortisol levels from 333nmol/L to 874nmol/L at 60 minutes and of 17OH Progesterone levels from 5.2nmol/L to 44.2nmo/L excluding adrenal insufficiency, but confirming the diagnosis of late-onset congenital adrenal hyperplasia. Genetic analyses: After written consent, the patient underwent genetic analysis of the CYP21A2 gene by direct sequencing and MLPA. The analyses revealed a heterozygous pathogenic variant in the CYP21A2 gene (c.293-13A/C>G). No other genetic variant was identified in the gene. Follow-up: Subsequent adrenal MRIs showed decreasing size of the left adrenal mass; 3 cm at 3 months, 2 cm at 6 months and no residual mass was seen at 9 months supporting the diagnosis of adrenal hemorrhage. Conclusion: To our knowledge, we report a first case of Castleman disease presenting with adrenal hemorrhage as initial symptom with the association of late-onset congenital adrenal hyperplasia. The possible link between these diseases remains to be explored. Presentation: 6/3/2024

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