huge lung cancer(necrotizing pneumonia)

ABDOMEN PELVIS CECT;

C.I: constipation, ileus.

. severe colon mechanical ileus (abrupt transition zone in rectosigmoid junction)
-- sigmoid volvulus (closed loop obstruction)
. ischemic change or impending strangulation of sigmoid colon
. probable rectal Bleeding hemorrhoids
. small amount of pelvic fluid collection
. Diffuse atherosclerosis in the aorta and its branch.
. RLL bronchial obstruction with 4.4cm extent low attenuated mass like density, causing RLL lobar atelectasis
-- cannot exclude lung cancer, DDx. obstructive necrotizing pneumonia