Small Bowel Neoplasms: A Pictorial Review.

Small bowel tumors are rare and account for approximately 3% of all gastrointestinal tumors in the United States. The incidence of small bowel neoplasms is rising-in particular, there is a rising incidence of small bowel carcinoid tumors. This may in part be due to small bowel lesion identification in an increasing number of cross-sectional imaging studies performed for other indications as well as increased use of advanced imaging techniques to assess specifically for small bowel disease. Diagnosis is a challenge owing to nonspecific clinical manifestation, rare occurrence, and low index of clinical suspicion. Yet, various small bowel neoplasms have characteristic imaging features at CT and MRI when optimal distention of the small bowel is achieved, correlating well with features seen in gross specimens. Understanding the imaging features of small bowel neoplasms is important to improve the radiologist's ability to diagnose and characterize small bowel neoplasms. Most small bowel tumors are clinically silent for long periods, and nearly half of the benign tumors are found incidentally during surgery or at cross-sectional imaging performed for other reasons. The authors review the imaging features of common benign and malignant small bowel neoplasms to aid the radiologist in diagnosis of small bowel tumors. ©RSNA, 2020.

Bilateral adrenal myelolipomas presenting as acute adrenal insufficiency in an adult with congenital adrenal hyperplasia.

Adrenal myelolipomas are relatively rare tumours composed of adipocytes and myeloid cells that arise in response to chronic adrenocorticotropic hormone stimulation. We present the case of bilateral adrenal myelolipomas in a 39-year-old man with untreated congenital adrenal hyperplasia (CAH) presenting with acute adrenal insufficiency and severe virilisation. Phenotypically, he is a man of short stature and has hyperpigmentation of the skin, gingiva and nail beds. Genital examination revealed micropenis and no palpable testes. Laboratory testing was consistent with primary adrenal insufficiency. An abdominal CT showed bilateral adrenal myelolipomas. An MRI of the pelvis revealed female reproductive organs. Chromosome study showed a karyotype of 46,XX. A CYP21A2 gene mutation confirmed diagnosis of CAH with 21-hydroxylase deficiency. The patient was treated with stress dose corticosteroids, subsequently tapered to physiological doses. We review previously reported cases and discussed diagnosis and treatment, including hormonal therapy and psychological approach.