The lying down adrenal sign or pancake adrenal gland refers to the flattened, pancake-like appearance of the adrenal gland in the renal fossa seen in association with absence of the ipsilateral kidney 1. It is described as the ‘lying down adrenal sign’ in reference to the appearance of the affected adrenal gland to be ‘lying down’ on the psoas muscle posteriorly 2.
- 1. Dyer RB, Chen MY, Zagoria RJ. Classic signs in uroradiology. Radiographics. 2004;24 Suppl 1 (suppl 1): S247-80. Radiographics (full text) - doi:10.1148/rg.24si045509 - Pubmed citation
- 2. Hoffman CK, Filly RA, Callen PW. The "lying down" adrenal sign: a sonographic indicator of renal agenesis or ectopia in fetuses and neonates. J Ultrasound Med. 1992;11 (10): 533-6. J Ultrasound Med (abstract) - Pubmed citation
- 3. Virginia B. Planz, Raymond B. Dyer. The “pancake” adrenal. (2015) Abdominal Imaging. 40 (6): 2041. doi:10.1007/s00261-014-0287-6 - Pubmed