Pseudomelanoma

Pseudomelanoma

Pseudomelanoma also known as recurrent nevus is a nevus which recurs in a scar and resembles a melanoma at the site of a recent shave removal of a melanocytic nevus.[1]: 689 [2]

Problem with the recurrent nevus

The melanocytes left behind in the wound regrow in an abnormal pattern. Rather than the even and regular lace like network, the pigments tends to grow in streaks of varying width within the scar. This is often accompanied by scarring, inflammation, and blood vessel changes – giving both the clinical and histologic impression of a melanoma or a severe dysplastic nevus. When the patient is reexamined years later without the assistance of the original biopsy report, the physician will often require the removal of the scar with the recurrent nevus to assure that a melanoma is not missed.

Saucerization biopsy

Also known as "scoop", "scallop", or "shave" excisional biopsy,[3] or "shave excision". A trend has occurred in dermatology over the last 10 years with the advocacy of a deep shave excision of a pigmented lesion[4][5][6] An author published the result of this method and advocated it as better than standard excision and less time-consuming. The added economic benefit is that many surgeons bill the procedure as an excision, rather than a shave biopsy. This save the added time for hemostasis, instruments, and suture cost. The great disadvantage, seen years later is the numerous scallop scars, and a very difficult to deal with lesions called a "recurrent melanocytic nevus". What has happened is that many "shave" excisions does not adequately penetrate the dermis or subcutaneous fat enough to include the entire melanocytic lesion. Residual melanocytes regrow into the scar. The combination of scarring, inflammation, blood vessels, and atypical pigmented streaks seen in these recurrent nevus gives the perfect dermatoscopic picture of a melanoma.[7][8][9][10][11][12] When a second physicians re-examine the patient, he or she has no choice but to recommend the reexcision of the scar. If one does not have access to the original pathology report, it is impossible to tell a recurring nevus from a severely dysplastic nevus or a melanoma. As the procedure is widely practiced, it is not unusual to see a patient with dozens of scallop scars, with as many as 20% of the scars showing residual pigmentation. The second issue with the shave excision is fat herniation, iatrogenic anetoderma, and hypertrophic scarring. As the deep shave excision either completely remove the full thickness of the dermis or greatly diminishing the dermal thickness, subcutaneous fat can herniate outward or pucker the skin out in an unattractive way. In areas prone to friction, this can result in pain, itching, or hypertrophic scarring.

See also

References

  1. ↑ James, William D.; Berger, Timothy G.; et al. (2006). Andrews' Diseases of the Skin: clinical Dermatology. Saunders Elsevier. ISBN 0-7216-2921-0.
  2. ↑ DE, Elder; D, Massi; RA, Scolyer; R, Willemze (2018). "2. Melanocytic tumours". WHO Classification of Skin Tumours. Vol. 11 (4th ed.). Lyon (France): World Health Organization. pp. 94–95. ISBN 978-92-832-2440-2. Archived from the original on 11 July 2022. Retrieved 4 July 2023.
  3. ↑ Ho J, Brodell R, Helms S (2005). "Saucerization biopsy of pigmented lesions". Clinics in Dermatology. 23 (6): 631–635. doi:10.1016/j.clindermatol.2005.06.004. PMID 16325072.
  4. ↑ Mendese, Gary (6 January 2007). ""The Diagnostic and Therapeutic Utility of the Scoop-Shave for Pigmente" by Gary W. Mendese". Senior Scholars Program. Escholarship.umassmed.edu. Archived from the original on 2 July 2013. Retrieved 17 October 2011.
  5. ↑ Buka, Robert L.; Ness, Rachel C. (1 September 2008). "Surgical Pearl: The Pendulum or "Scoop" Biopsy". Clinical Medicine & Research. 6 (2): 86–87. doi:10.3121/cmr.2008.804. PMC 2572555. PMID 18801951. Archived from the original on 13 September 2021. Retrieved 10 February 2022 – via www.clinmedres.org.
  6. ↑ Archived 6 April 2005 at the Wayback Machine
  7. ↑ J Dermatol Surg Oncol. 1984 Oct;10(10):811-5.
  8. ↑ "Abstract". Color Atlas of Melanocytic Lesions of the Skin. SpringerLink: 147–150. doi:10.1007/978-3-540-35106-1_23.
  9. ↑ "Recurrent Nevus (c20t3)". Pathology-skin-rjreed.com. Archived from the original on 5 October 2011. Retrieved 17 October 2011.
  10. ↑ Dr Eric EHRSAM (21 November 2007). "dermoscopy: Recurrent nevus". Dermoscopic.blogspot.com. Archived from the original on 15 February 2012. Retrieved 17 October 2011.
  11. ↑ "Congenital NevusT(c7bt2)". Pathology-skin-rjreed.com. Archived from the original on 5 October 2011. Retrieved 17 October 2011.
  12. ↑ "USCAP Homepage". Uscap.org. Archived from the original on 29 September 2011. Retrieved 17 October 2011.
Classification
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