Colloid nodule

Colloid nodule

Colloid nodules, also known as adenomatous nodules[1], are benign, noncancerous overgrowths of thyroid tissue[2]. Although they may grow large, and there may be more than one, they are not malignant and they will not spread beyond the thyroid gland. Colloid nodules are the most common kind of thyroid nodule[3].



Colloid nodules are usually small enough to be undetectable without an ultrasound or other imaging techniques. [4] They usually produce no symptoms, so patients are unlikely to notice them until their size makes them easier to detect. Like other thyroid nodules, they are usually first noticed in a routine physical examination. [5]


Colloid nodules may be initially identified as an unspecified kind of thyroid nodule. Follow-up examinations typically include an ultrasound if it's unclear whether or not there really is a nodule present. Once the presence of a nodule has been confirmed, the determination of the kind of thyroid nodule is done by fine needle aspiration biopsy [6].

Colloid nodules are distinguished by an apparently gelatinous mass of colloid both surrounding and contained within follicular cells. Colloid nodules are not surrounded by a fibrous capsule of compressed tissue. However, they are surrounded by flattened epithelial cells [7]. Both the number of cells and the type of colloid may vary considerably. [8]


  1. ^ Joe Antony, MD (11 June 2011). "Ultrasound images of diseases of thyroid gland". Retrieved 26 September 2011. 
  2. ^ "Diseases & Conditions: Thyroid Nodules". 10 August 2010. Retrieved 26 September 2011. 
  3. ^ "Thyroid Nodules". 1 February 2003. Retrieved 26 September 2011. 
  4. ^ "The Truth About Thyroid Growths: Origins, Symptoms, and Outcomes". American Academy of Family Physicians. 21 June 2007. Retrieved 26 September 2011. 
  5. ^ "Thyroid nodule". Medline Plus. 19 April 2010. Retrieved 26 September 2011. 
  6. ^ Diana S. Dean, M.D. Hossein Gharib, M.D. (10 October 2010). "Fine-Needle Aspiration Biopsy of the Thyroid Gland, Chapter 6d.". Retrieved 26 September 2011. 
  7. ^ Dr. Alpha Tsui (10 October 2010). "Thyroid cytology". Retrieved 26 September 2011. 
  8. ^ Diana S. Dean, M.D. Hossein Gharib, M.D. (10 October 2010). "Fine-Needle Aspiration Biopsy of the Thyroid Gland, Chapter 6d.". Retrieved 26 September 2011. 

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