What is the most likely diagnosis?
Interstitial pulmonary oedema (cardiogenic).
Central thin interstitial lines a number of centimeters long extending away from the hila (but not representing vessels) are known as what?
Kerley A lines.
What are the peripheral 2 - 3 cm lines known as?
Kerley B lines when seen abutting the pleura laterally. On lateral chest x-rays the same lines seen in the retrosternal location are known as Kerley D lines.
Single lead PPM in situ. The heart is enlarged and there is marked prominence of the interstitial lines. Minimal blunting of the left costophrenic angle.