You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Investigation of choice for bronchiectasis is- and explain in detail?
Ans. is 'd' i.e., HRCT * HRCT is the investigation of choice for bronchiectesis* The CT criteria for diagnosis include 'signet -ring' sign (bronchus being larger than accompanying vessel), bronchial wall thickening, and bronchi visible within 1 cm of the pleura.* Three types are described according to Their appearance :-A. Cylindrical:- Mild diffuse dilatation of the bronchi. Radiologically there is Tram - Trank appearance, i.e. lack of peripheral tapering.B. Varicose:- Cystic bronchial dilatation interrupted by focal areas of narrowing, giving radiological appearance of'String of pearl (string of beads).C. Saccular (cystic):- Clusters of bronchi with marked saccular dilatation. Cystic bronchiectasis in any region is easily recognized as clusters of rounded lucencies, often containing air - fluid levels; this appearance has been linked to a 'cluster of grapes'.Investigations of choice in respiratory systemDiseaseInvestigation* Interstitial lung disease* HRCT* Bronchiectasis* HRCT (1st choice)* Bronchography (2nd choice)* Pulmonary embolism* CT with i.v. Contrast (1st choice)* V/Q scan (2nd choice)* Solitary pulmonary nodule* CT scan* Calcification* CT scan* Pulmonary malignancy* CT scan (except in superior sulcus or pancoast tumor)* Superior sulcus or pancoast tumor* MRI