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Castell point

If you’ve ever stood at the bedside trying to figure out whether the spleen is enlarged—without an ultrasound in sight—Castell’s point is the skill you need in your hands. It’s quick, elegant, and surprisingly underappreciated. Let’s walk through its history, the technique, and what the evidence actually says. The Eponym and Its Origins Castell’s point is named after Donald O. Castell, an American gastroenterologist who published the key description in 1967 in the Annals of Internal Medicine. His paper, “The Spleen Percussion Sign,” was a straightforward clinical study evaluating a single percussion point as a rapid bedside screen for splenomegaly. Castell’s insight was refreshingly practical: instead of attempting to outline the entire spleen by percussion—a notoriously unreliable exercise—why not focus on one reproducible spot and ask a single yes-or-no question? Anatomy Behind the Technique To understand Castell’s point, picture the lowest intercostal space in the left anterior axil...
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Traube’s triangle

Hey there, fellow med students and bedside pros! If you’re honing your physical exam skills, Traube’s triangle is one of those classic percussion spots worth mastering. It’s a simple way to screen for splenomegaly or pleural issues right at the patient’s side—no fancy gear required. Let’s dive into its story, how to examine it, and what it really tells you. Ludwig Traube first described this crescent‑shaped area on the left chest in the 1860s, and his assistant Oscar Fraentzel published the earliest detailed account in 1868 in Berliner klinische Wochenschrift . Fraentzel referred to it as the “halbmondförmigen Raum” and outlined its boundaries while crediting Traube. Over time, clinicians began calling it Traube’s triangle—a convenient geometric nickname for the same space. Anatomically, picture a triangle on the left lower chest: its upper border runs along the 6th rib from the midclavicular to the midaxillary line, its lateral border follows the left midaxillary line downward, an...
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Hollenhorst plaque

A Small Spark With a Big Story A Hollenhorst plaque is a tiny, bright, yellow spot that sometimes appears in the small arteries of the retina. It looks harmless, but it can reveal important information about the health of the body’s blood vessels. This little spark of light has a surprisingly long and interesting history. A Sign First Noticed Long Before It Had a Name Doctors began noticing unusual bright spots in the retinal arteries as early as the late 1800s. These early descriptions didn’t yet identify cholesterol crystals, but they showed that something was traveling through the bloodstream and lodging in the eye. In 1927, a physician named Butler described a particularly bright embolus that closely resembles what we now recognize as a Hollenhorst plaque. The Breakthrough Observations of 1958 The modern story began in 1958, when two groups of doctors independently described shiny, reflective yellow plaques in the retinal arteries. One of them was Robert W. Hollenhorst, a vascular ...
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Mechanic’s hands

Many clinicians recognize mechanic’s hands as a classic dermatologic clue in dermatomyositis and antisynthetase syndrome . Yet the story of how this sign entered the medical literature is surprisingly recent. For those who enjoy the history behind clinical findings—and how our diagnostic vocabulary evolves—this brief overview revisits the earliest description and traces how the concept took shape over time. Early Origins: The 1979 First Report The earliest known paper describing what we now call mechanic’s hands was published in 1979. The authors detailed several characteristic features: • Hyperkeratotic eruptions on the ulnar aspect of the thumb and the radial sides of the fingers • Desquamation and rhagades (fissures) • A symmetric distribution • Absence of pruritus or vesicles, helping distinguish it from eczema • Histopathology showing liquefaction degeneration and colloid bodies, further separating it from common eczematous processes Although the authors did not yet use the term...
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Heliotrope rash

Before we dive in, here’s a quick welcome. The heliotrope rash is one of those classic dermatologic clues that many clinicians learn about early, but its history is surprisingly interesting. I hope this short piece helps you recall the essentials with ease. What Is the Heliotrope Rash? The heliotrope rash is a purple‑violet discoloration that appears on the upper eyelids. It is one of the most recognizable skin findings in dermatomyositis. The first clear medical description of this rash was published in 1916 by William H. Rabe. Writing in the Deutsche Zeitschrift für Nervenheilkunde, Rabe described four patients with what he called “dermatomyositis.” Among their symptoms, he highlighted a distinctive purplish color around the eyes—likened to the heliotrope flower. His observation became a defining diagnostic feature and remains so today. Historical Context Dermatomyositis itself had been described earlier, in 1868 by Wagner. However, those early reports did not mention the eyelid rash...
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Gottron sign

Recognizing the Gottron Sign: A Friendly Guide for Busy Healthcare Staff Skin findings often give us the earliest clues that something deeper is going on. Among these, the Gottron sign is one of those subtle but highly informative dermatologic hints that can point toward dermatomyositis (DM). If you work in primary care, emergency medicine, dermatology, or general internal medicine, having this sign in your mental toolbox can make a real difference in early detection. Let’s walk through what it looks like, why it matters, and how to use it in everyday clinical practice. What Exactly Is the Gottron Sign? The Gottron sign refers to flat, erythematous or violaceous macules or plaques that appear over extensor surfaces. The most common locations include: • Elbows • Knees • Knuckles ( MCP and IP joints ) • Ankles These lesions are typically symmetric and may look like a sun‑exposed rash at first glance. Unlike Gottron papules —which are raised—the Gottron sign is flat, which is the key di...
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