We report three cases of bronchogenic cysts, one initially infected and two initially noninfected, with one of the two then becoming infected. The non-infected bronchogenic cyst was filled with echogenic material, and the aspirate was a whitish jelly-like fluid. The infected bronchogenic cysts were anechoic, fluid-fluid levels were identified, and the aspirate was turbid dark red. A fluid-fluid level on the US image, which can help to confirm the cystic nature of the lesion, has not been hitherto reported. The correlation of sonographic features with gross appearance of the cyst contents will help to avoid or minimize needle aspiration. We report three cases of bronchogenic cysts, one initially infected and two initially noninfected, with one of the two then becoming infected. The non-infected bronchogenic cyst was filled with echogenic material, and the aspirate was a whitish jelly-like fluid. The infected bronchogenic cysts were anechoic, fluid-fluid levels were identified, and the aspirate was turbid dark red. A fluid-fluid level on the US image, which can help to confirm the cystic nature of the lesion, has not been hitherto reported. The correlation of sonographic features with gross appearance of the cyst contents will help to avoid or minimize needle aspiration.