title: Looking at four corners.
authors.affiliation: Department of Radiodiagnosis and Imaging, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India E-mail: binitsurekapgi@gmail.com.
authors.forename: Binit
authors.initials: B
authors.lastname: Sureka
authors.affiliation: Department of Radiodiagnosis and Imaging, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India E-mail: binitsurekapgi@gmail.com.
authors.forename: Aliza
authors.initials: A
authors.lastname: Mittal
authors.affiliation: Department of Radiodiagnosis and Imaging, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India E-mail: binitsurekapgi@gmail.com.
authors.forename: Mahesh Kumar
authors.initials: MK
authors.lastname: Mittal
authors.affiliation: Department of Radiodiagnosis and Imaging, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India E-mail: binitsurekapgi@gmail.com.
authors.forename: Brij Bhushan
authors.initials: BB
authors.lastname: Thukral