Which of the following are true regarding the appearance of sarcoidosis on HRCT?

Which of the following are true regarding the appearance of sarcoidosis on HRCT?
a) Isolated involvement of posterior mediastinal lymph nodes is common
b) Nodules have a typical bronchovascular distribution
c) Subpleural nodules are unusual
d) Thickening of interlobular septae occurs
e) Mosaic lung attenuation is a well recognised feature