Most Ischiopagus cases are common in the areas of India and Africa. Of the varieties of Ischiopagus twins, Ischiopagus Tetrapus is more prevalent, happening in 68.75% of all Ischiopagus cases. Ischiopagus Tripus occurs in 31.25% of cases while Ischiopagus Dipus occurs in only 6.25% of all Ischiopagus cases. == References ==
After passing the required Royal College of Pathologists exams and gaining a Certificate of Completion of Specialist Training, the trainee is entitled to apply for registration as a specialist. Many oral and maxillofacial pathologists in the UK are clinical academics, having undertaken a PhD either prior to or during training. Generally, oral and maxillofacial pathologists in the UK are employed by dental or medical schools and undertake their clinical work at university hospital departments. New Zealand
There are 5 practising Oral Pathologists in New Zealand (as of May 2013). Oral pathologists in New Zealand also take part in forensic evaluations. See also
Tongue disease
Salivary gland disease
Head and neck cancer
Oral surgery
Tooth pathology

References
Further reading
Fechner RE (2002). "A Brief History of Head and Neck Pathology". Modern Pathology. 15 (3): 221–228. doi:10.1038/modpathol.3880519. PMID 11904339. External links

 Media related to Diseases and disorders of oral cavity, salivary glands and jaws at Wikimedia Commons
British Society of Oral & Maxillo-facial Pathologists Website
Academy of Oral and Maxillofacial Pathology Website