Acute Adrenal Infarct in a Pregnant Female With Severe Abdominal Pain

Abstract

Abstract Background: The differential diagnosis for pregnant patient presenting with abdominal pain is broad. Adrenal infarction is a rare cause of such presentation. Clinical Case: A 24-year-old woman, 30 weeks pregnant, presented to the emergency room with severe, sharp, left upper quadrant abdominal pain that radiated to the back and was associated with nausea and vomiting. Abdominal exam showed tenderness to light palpation in the left upper area with voluntary guarding. Genitourinary exam revealed a closed cervical os. Abdominal MRI noted a T2 hypointense left adrenal gland with loss of normal diffusion restriction. Edematous changes were identified within the left perinephric and anterior pararenal spaces. Left adrenal gland non-hemorrhagic infarction with necrosis was diagnosed, and patient was started on enoxaparin. Patient was admitted for hydration and pain control. A morning serum cortisol was equivocal at 10.3 µg/dL with a mid-normal ACTH of 38.9 pg/mL. ACTH stimulation noted a suboptimal cortisol response with a serum cortisol at baseline of 9.1 µg/dL, at 30 minutes 10.7 µg/dL, and at 60 minutes 11.0 µg/dL. Patient was started on stress dose intravenous hydrocortisone. Evaluation for thrombophilia was undertaken and patient initiated on therapeutic weight-based enoxaparin. Investigations for etiology included normal factor V leiden, proteins C and S activity, antithrombin III antigen, antiphospholipid screening, C3 and C4 complement, anti-double stranded DNA antibody, anti-neutrophil cytoplasmic antibody, cryoglobulin, homocysteine, and factor II mutation. Factor VIII activity was increased >200%, which is within expected range during pregnancy. Patient was heterozygous for MTHFR C677T and A1298C mutations. Hydrocortisone was tapered and patient discharged on a physiologic dose, in addition to enoxaparin. Conclusion: Unilateral adrenal infarction is an uncommon entity in general, and even more uncommon during pregnancy (1). Thrombophilia evaluation is warranted as antiphospholipid syndrome and MTHFR gene mutations have been associated with this condition. Given the rarity of this disease, it may not be included in the differential diagnosis of pregnant patients who present with acute abdominal pain. MRI is superior to other imaging modalities due to its sensitivity in detecting adrenal infarct and even hemorrhage, if present. Unfortunately, there are no guideline on managing such patients, but the focus is usually placed on anticoagulation to prevent the infarction of the contralateral adrenal gland, with cautious monitoring as hemorrhagic conversion is possible. Screening patient for adrenal insufficiency for prompt supplementation of corticosteroids if needed is necessary, while attempting to find the underlying cause. Reference: (1) Green P., et al. Unilateral adrenal infarction in pregnancy. BMJ Case reports. 2013; bcr2013009997