Ravi Singh K @rav7ks
1.3M 760 370
Academic Hospitalist and Associate Program Director @SinaiBmoreIMRes, Medicine clerkship director GW School of Medicine and Health Sciences RMC at Sinai, Hopkins Medicine Clerkship Site Director, Clinical reasoning,Simulation and POCUS enthusiast - https://twitter.com/rav7ks
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Reversed Halo Sign - Infectious and Non-Infectious Differential Diagnosis
Definition: A focal rounded area of GGO surrounded
Reversed Halo Sign ... a crescent or complete ... • Infectious Causes ... Non-Infectious Causes ... #Differential #Diagnosis
Hair Loss (Alopecia) - General (Diffuse and Focal) Differential Diagnosis Algorithm

DIFFUSE
Scarring - Irreversible-biopsy required
 • Lupus
Alopecia) - General (Diffuse ... ) Differential Diagnosis ... Algorithm DIFFUSE ... #Differential #Diagnosis ... #Algorithm #causes
Eosinophilic Pneumonia
When to suspect Eosinophilic Pneumonia? Non-resolving pneumonia + BAL > 25% eosinophils + excluded more
excluded more common diagnoses ... Chest Pain - Diffuse ... Consolidations AKA "inverse ... Eosinophilic #Pneumonia #diagnosis
Hypercalcemia - Differential Diagnosis Algorithm
Elevated PTH (High or normal):
 • Primary Hyperparathyroidism
 • Familial Hypocalciuric Hypercalcemia
Low
- Differential Diagnosis ... Algorithm Elevated ... #Differential #Diagnosis ... #Algorithm #causes
Hypokalemia - Differential Diagnosis Algorithm
Extra-renal Losses:
 • Normal Acid-Base: Low intake
 • Metabolic acidosis: Gl tract
- Differential Diagnosis ... Algorithm Extra-renal ... #Differential #Diagnosis ... #Algorithm #causes
Proptosis - Differential Diagnosis - Unilateral vs Bilateral
Unilateral:
 • Infections (can become bilateral with cavernous sinus
- Differential Diagnosis ... • Diplopia • Fevers ... #Differential #Diagnosis ... Unilateral #Bilateral #Causes
Causes of Tremors - Movement Disorders - Differential Diagnosis Algorithm
Action Tremor - Occurs During Voluntary Muscle
Causes of Tremors ... - Differential Diagnosis ... Algorithm Action ... #Differential #Diagnosis ... #Algorithm #Causes
ID Approach to Fever and Rash - Diagnostic Algorithm
Central Maculopapular (most common):
Measles, Parvovirus 819 / EBV,
Fever and Rash - Diagnostic ... Algorithm Central ... Viral hemorrhagic fevers ... Rash #Febrile #Diagnosis ... #Algorithm #Schema
Stool Cultures - Indications in Diarrhea
Patient Categories to Order Stool Cultures On:
 • Persisting 1 week
Bloody diarrhea • Severe ... Few infectious causes ... #Indications #diagnosis
Polycythemia - Differential Diagnosis Algorithm
Polycythemia itself isn’t a diagnosis. Like many things, it is a condition
- Differential Diagnosis ... Algorithm Polycythemia ... an underlying cause ... about secondary causes ... #Algorithm #workup