Naqibullah Foladi

Citation: Foladi N, Kearns C, Kang O, et al. Chevron sign (achondroplasia). Reference article, Radiopaedia.org (Accessed on 18 Feb 2025) https://doi.org/10.53347/rID-69213 rID: 69213 Last revised: 18 Feb 2025, Ciléin Kearns ◉ Disclosures: At the time the article was last revised Ciléin Kearns had no financial relationships to ineligible companies to disclose.

High Altitude Illness occurs due to abrupt ascent to high altitudes (>2500m) without acclimatization. It typically develops in hikers with rapid high-altitude ascension. High altitude illness is grouped into 3 categories based on their clinical presentation. Acute Mountain Sickness (AMS), where there is only headache, fatigue, and nausea. High Altitude Pulmonary Edema (HAPE), presenting with dyspnea and hyperventilation.

Laimer diverticula occur in the cervical esophagus in the posterior midline inferior to the cricopharyngeal muscle 1,2. They are difficult to differentiate from Zenker diverticulum on imaging and endoscopy can be helpful in determining the exact location of the diverticulum 1-3. Epidemiology This is an extremely rare entity, so far seen in a younger population compared to Zenker diverticulum 1-3.