1. Hair extracted from an ulcer;Anderson;Boston M. & S. J.,1847
2. Diagnosis and treatment of pilonidal sinus;Anderson;Minnesota Med.,1931
3. Sacrococcygeal tumors, adenocareinoma of cystic congenital embryonal remnant;Ballantyne;Arch. Path.,1932
4. Congenital tumors of the coccygeal region;Bateman;Ann. Surg.,1924
5. Infected dermoid sacral cyst; excision; no suture; skin regeneration aided with adhesive strips;Beck;Internat. Clin.,1921