Mushroom cap sign in MRI is seen in:-
IIeocaecal TB
Pulmonary endometriosis
Ovarian endometriosis
Rectal endometriosis
Rectosigmoid endometriosis: - The endometrial deposit on rectum causes proliferation of muscularis propria and the surrounding tissues which is seen as "mushroom cap sign" in T2 weighted MRI.
Women Imaging