IgG4 related Inflammatory Pancreatic Head Pseudotumor Mirror Pancreatic Carcinoma: A Novel Case Series with a Review of the LiteratureFaheemullah Khan, MBBS, MD1, Jehanzeb Shahid, MBBS, FCPS2, Amna Saleem, MBBS3, Uzzam Ahmed Khawaja, MBBS4, Wasim Ahmed Memon, MBBS, FCPS5, Uffan Zafar, MBBS6, Tariq Abdul Hameed, MD, DABR7, Khabab Abbasher Hussien Mohamed Ahmed, MBBS8* 1,2,5,6Department of Radiology, Aga Khan University Hospital, Karachi, Pakistan.3,4Jinnah Medical and Dental College, Karachi, Pakistan.7Department of Radiology, Indiana University School of Medicine, Indiana, US.8Faculty of Medicine, University of Khartoum, Khartoum, SudanFaheemullah Khan : Email: islamianfellow@hotmail.com, ORCID:https://orcid.org/0000-0001-6369-743XJehanzeb Shahid: Email:jehanzeb.shahid@aku.eduAmna Saleem: Email: amna.saleem41@hotmail.comUzzam Ahmed Khawaja: Email: uzzamahmedkhawaja@gmail.comWasim Ahmed Memon:Email:wasim.memon@aku.eduTariq Abdul Hameed: Email: thameed@iupui.eduKhabab Abbasher Hussien Mohamed Ahmed: Email: khabab9722@gmaail.com, ORCID:https://orcid.org/0000-0003-4608-5321Article type : Case SeriesAbstract: 105Main text : 1907 (Main document)Tables : 0Figures : 5References : 27Pages : 10