title: Intra-anal pilonidal sinus disease: a unique diagnosis possibly pointing to the occiput.
authors.affiliation: Department of Procto-Surgery, St. Marienhospital Vechta, Academic Teaching Hospital of The Hannover University, Vechta, Germany.
authors.forename: Dietrich
authors.initials: D
authors.lastname: Doll
authors.affiliation: Department of Surgery, Luzerner Kantonsspital Sursee, Sursee, Switzerland.
authors.forename: Verena K
authors.initials: VK
authors.lastname: Stauffer
authors.affiliation: Department of Anaesthesiology and Pain Therapy, Bern University Hospital Inselspital, University of Bern, Bern, Switzerland.
authors.forename: Markus M
authors.initials: MM
authors.lastname: Luedi
mesh_terms: D001003:Anal Canal / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008875:Middle Aged; D010864:Pilonidal Sinus / Q000175:diagnosis*