With advances in computed tomography and magnetic resonance imaging technology, diagnosis with these less invasive investigations are the favored option. However, traditional catheter angiography is still the gold standard. The management of significant hemobilia is still centered on arterial embolization, but arterial and biliary stents have become accepted alternative therapies.

Ischemic colitis is a common cause of hospital admissions; however it is frequently confused intellectually with mesenteric ischemia and often misdiagnosed as infectious diarrhea or Clostridium difficile colitis. Ischemic colitis is caused by non-occlusive insult to the small vessels supplying the colon without a clear precipitating factor. It is more common in females and in patients above 60 years of age. The classic presentation includes sudden onset of lower abdominal pain followed by the urge to defecate and bloody diarrhea. Focal right-sided ischemic colitis has more pain and a worse prognosis. Choosing the correct diagnostic studies is challenging and requires proficient knowledge of the disease. Management is usually conservative, however around 10-20% of the patients will require surgery. Acute ischemic colitis usually resolves; nevertheless some patients may develop chronic segmental colitis or a stricture. One ischemic colitis caveat is that it may be the first sign of undiagnosed cardiac disease. A firm grasp on this common yet little discussed condition is valuable to a gastrointestinal consultant and hospitalist alike.

Serrated polyps were once thought to have no clinical implications with regards to the development of colorectal cancer (CRC). Over the past several years, published data have enabled clinicians to develop a better understanding of these lesions. The serrated pathway associated with these lesions involves an epigenetic mechanism characterized by abnormal hypermethylation of CpG islands located in the promoter regions of tumor suppressor genes. It is often associated with BRAF mutations and may account for 15-35% of all CRC. This pathway may also play a major role in proximal neoplasia and missed cancer. There are three distinct subtypes of serrated neoplasia; hyperplastic (70% of all serrated polyps), sessile serrated adenoma/polyp (SSA/P) (25%) and traditional serrated adenoma (<2%). The last two forms are considered to be precursors for CRC. SSA/P are associated with synchronous CRC especially if the polyps are large (≥1 cm), multiple, or if they are in the proximal colon. Lesions containing serrated neoplasia are usually flat or sessile, may be large, and occasionally have a mucous cap. Serrated lesions provide many challenges for the clinician and may be difficult to detect and completely remove. Furthermore, pathologists may misclassify SSA/P as HP. For the first time, the Multi-Society Task Force guidelines for colorectal polyp surveillance have included the management of serrated lesions in their published recommendations. In addition, an expert panel has also recently issued recommendations regarding serrated neoplasia. In this article, we provide the reader with a summary as well as the latest developments regarding serrated colonic lesions.

SummaryPeriodic paralysis in the setting of hypokalemia can be the result of several underlying conditions, requiring systematic evaluation. Thyrotoxic periodic paralysis (TPP), a curable cause of hypokalemic periodic paralysis, can often be the fi rst manifestation of thyrotoxicosis. Because the signs and symptoms of thyrotoxicosis can be subtle and clouded by the clinical distress of the patient, the diagnosis of the underlying metabolic disorder can be overlooked. The authors report a case of TPP in a young Chinese man in whom the diagnosis of thyrotoxicosis was initially missed. This case illustrates the lack of awareness of TPP among many physicians, delay in the diagnosis of TPP and the importance of performing thyroid function testing in all cases of periodic paralysis.

Medical students need more exposure to and a greater understanding of their role in public health throughout their training, which may influence more of them to pursue careers in public health or change how they practice medicine in the future. A novel colorectal cancer education session was created for first year medical students to attempt to increase public health interest, improve colorectal cancer knowledge and discuss barriers to colorectal cancer screening. We constructed a novel integrated interactive peer led colorectal cancer educational session of panelists with a wide range of experiences in colorectal cancer and colorectal cancer screening. The session involved a didactic component, case presentation, and group exercises followed by assembly discussion. We surveyed first-year medical students over two consecutive years to assess their interest in public health, knowledge of colorectal cancer, and perceptions of barriers to colorectal cancer screening before and after the educational session. We also evaluated student satisfaction with the session. We compared the pre- and post-survey results to assess for changes in interest, knowledge and perceptions. 74.63% of students in 2018 and 67.7% in 2019 evaluated the session as excellent or good, with knowledge regarding colorectal cancer screening markedly increased after the educational session. Students reported knowledge and access to healthcare among the biggest patient barriers to colorectal cancer screening. Interest in public health increased by 7.5% and 5.6% in 2018 and 2019, respectively. The implementation of this interactive educational peer led exercise can increase interest in public health, improve knowledge of colorectal cancer prevention and facilitate discussions of colorectal cancer screening barriers. We hope to encourage other programs to adopt this preliminary model. Supplementary Information The online version contains supplementary material available at 10.1007/s13187-021-02087-y.