This article is to discuss lung fibrosis regarding its known types , aetiology, clinical picture (manifestations), investigations and management . Types of pulmonary fibrosis 1• Interstitial pulmonary fibrosis . 2• Parenchymatous pulmonary fibrosis . Etiology ( Causes of pulmonary fibrosis ): TB - lung abscess - Bronchiectasis - Empyema Clinical picture Pulmonary fibrosis (parenchymatous) 1- Manifestations of the cause or past history of TB - lung abscess - Bronchiectasis - Empyema 2- Dyspnea, chronic dry cough . 3- Cyanosis (In advanced stage) Local examination (The affected side showing multiple negative signs): • Inspection : Diminished movement, retraction. • Palpation : TVF Low, diminished chest expansion, trachea deviated to the same side of the lesion. TVF is High with Marked tracheal shift to the same side • Percussion : Dullness, if the fibrosis is left sided it does not affect the traube's area (resonant traube's area), to be differentiated from left sided pleural effusion. • Auscultation : Diminished Air entery - or diminished intensity of breath sounds, coarse non consonating crepitations . Investigations * X-ray shows : Crowded ribs, trachea shifted to the same side , Heterogenous opacity, Tenting of diaphragm * Pulmonary function tests showing restrictive hypoventilation. Treatment of pulmonary fibrosis Source : Pulmonary fibrosis causes, types, diagnosis and treatment