Rhinosinusitis, Epistaxis, Head & Neck Cancer & Mediastinal Pathology|LEC 5|First Aid Pulmonology

First Aid 2026 Respiratory | Lecture 5 Welcome to Lecture 5 of the Complete Respiratory System Series based on First Aid for the USMLE Step 1 (2026 Edition). In this lecture, we cover First Aid Respiratory (Pages 690–691) with high-yield concepts explained from the basics for MBBS, USMLE Step 1, FCPS Part 1, NRE, NEET PG, PLAB, MRCP, and AMC preparation. 📖 How to Study This Lecture Read First Aid 2026 Respiratory (Pages 690–691) before starting. Watch the lecture without taking notes on your first pass. Avoid distractions and focus on conceptual understanding. Pause whenever instructed, revise the corresponding First Aid pages, then continue the lecture. You may watch the lecture at 1.2× speed if comfortable. This lecture is part of the Complete Respiratory System Series, where every First Aid topic is explained conceptually with integration of Anatomy, Physiology, Pathology, Pharmacology, Embryology, Microbiology, and Clinical Correlations. 📚 Topics Covered Rhinosinusitis Anatomy of the Paranasal Sinuses Sinus Drainage Pathways (Superior, Middle & Inferior Meatus) Acute Viral vs Bacterial Rhinosinusitis Common Pathogens (Rhinovirus, H. influenzae, S. pneumoniae, M. catarrhalis) Complications (Orbital Cellulitis, Cavernous Sinus Syndrome & Meningitis) Epistaxis Kiesselbach Plexus Sphenopalatine Artery Anterior vs Posterior Epistaxis Common Causes High-Yield Anatomy Head & Neck Cancer Risk Factors (Smoking, Alcohol, HPV-16 & EBV) Field Cancerization Nasopharyngeal Carcinoma Laryngeal Papillomatosis HPV-6 & HPV-11 Clinical Presentation Mediastinal Pathology Mediastinal Anatomy Anterior, Middle & Posterior Mediastinal Masses 4 Ts of Anterior Mediastinum Differential Diagnosis of Mediastinal Masses Mediastinitis Acute vs Chronic Mediastinitis Causes Histoplasma capsulatum Clinical Features Pneumomediastinum Spontaneous vs Secondary Causes Boerhaave Syndrome Pathophysiology Hamman Sign Clinical Features If you found this lecture helpful, Like, Share, Comment, and Subscribe to Concepts to Clinics for the complete Respiratory System Series and more high-yield content for USMLE Step 1, MBBS, FCPS Part 1, NRE, NEET PG, PLAB, MRCP, and AMC. #mbbslectures #firstaidusmle #medicallectures #pathology #ent #usmle #neet #epistaxis #epistaxisselflessmedicose