Indian Journal of Pathology and Microbiology

: 2010  |  Volume : 53  |  Issue : 2  |  Page : 373-

Choristomas of the oral cavity

R Bansal 
 Gian Sagar Medical College and Hospital, Ramnagar, Banur, Punjab, India

Correspondence Address:
R Bansal
House No. 320/32-A, Chandigarh

How to cite this article:
Bansal R. Choristomas of the oral cavity.Indian J Pathol Microbiol 2010;53:373-373

How to cite this URL:
Bansal R. Choristomas of the oral cavity. Indian J Pathol Microbiol [serial online] 2010 [cited 2020 Jul 6 ];53:373-373
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This is with reference to the article by Naik et al 'Choristoma of the base of the tongue', Indian J Pathol Microbiol 2009;52:86-7. [1] The definition of choristoma stated by the author is erroneous. In simple words choristoma is an ectopic rest of normal tissue. These are proliferation of any histologically normal tissue in an abnormal location. [2] In the oral cavity, they may consist of proliferation of bone, cartilage, fat, neural and glial tissue, thyroid gland, respiratory, gastric or intestinal mucosa. [3]

Choristomas can occur anywhere in the body. Lymph node may contain salivary gland, thyroid follicles, squamous or mullerian epithelium and nevus cell rests. Salivary gland choristomas in middle ear, neuromuscular and rhabdomyomatous choristomas in central nervous system, granular cell choristoma of neurohypophysis, phakomatous choristoma of eye, cartilage choristoma of uterus, have been documented in literature. [4]

The author says that choristoma is a benign tumor where new bone formation occurs, and it occurs in the flat bones of the skull and face. [1] This statement is a self-contradictory one. There is a definite difference between choristoma and hamartoma. A hamartoma is also a benign lesion, which is composed of tissue elements normally found at that site, but are growing in a disorganized mass. [2],[4] The component elements of hamartoma are not foreign to that organ or tissue.

Choristomas are also not neoplastic lesions. [3],[4] Many a times they are found in the form of rests, without forming a mass lesion. Although neuromuscular hamartoma, composed of neural and skeletal muscle differentiation has been referred to as 'benign triton tumor', but it is technically incorrect. This has also been proved by karyotyping. [4]


1Naik VR, Wan Faiziah WA, Musa MY. Choristoma of the base of the tongue. Indian J Pathol Microbiol 2009;52:86-7.
2Raymond L, editor. Stedman's Medical Dictionary, 28 th edition. Philadelphia: Lippincott Williams and Wilkins; 2006.
3Bansal R, Trivedi P, Patel S. Cartilaginous choristoma of the tongue - report of two cases and review of literature. Oral Oncol Extra 2005;41:25-9.
4Rosai J, editor. Rosai and Ackerman's Surgical pathology, 9 th edition. New York: Mosby; 1996.