Ann Dermatol.  2008 Mar;20(1):41-44. 10.5021/ad.2008.20.1.41.

Nuchal-type Fibroma of the Coccyx

• Shin JB
• Son SW
• Kim IH

• KMID: 2156360
• DOI: http://doi.org/10.5021/ad.2008.20.1.41

Abstract

Nuchal-type fibroma is a recently described, rare, tumor-like process of fibrous tissue occurring chiefly in the dorsocervical area. Nuchal-type fibromas in extranuchal locations are morphologically indistinguishable from lesions involving the nuchal region. Histopathologic findings of nuchal-type fibroma are poorly demarcated, dense collagen bundles with sparsely scattered fibroblasts, some interspersed adipose tissue, and entrapped nerve fibers. We report a patient with a mass on the coccyx area, and these were histopathologically consistent with nuchal-type fibroma. This tumor was surgically excised, and no recurrence had been noted during the two year follow-up period.

Keyword

Coccyx; Nuchal; Nuchal-type fibroma

MeSH Terms

Adipose Tissue
Coccyx
Collagen
Fibroblasts
Fibroma
Follow-Up Studies
Humans
Nerve Fibers
Recurrence
Collagen

Figure

• 

  Fig. 1 3 × 4 cm sized, not tender, subcutaneous mass on the left side of coccyx area.

• 

  Fig. 2 T1-weighted MR imaging showing ill-defined low signal intensity on subcutaneous fat layer of posterior to coccyx.

• 

  Fig. 3 Histopathology showing poorly demarcated, dense collagen bundles with sparsely scattered fibroblasts (A, B). There were also some interspersed adipose tissues (C), and entrapped nerve fibers (D) (H&E, A: × 40, B-D: × 200).

Reference

1. Enzinger FM, Weiss SW. Benign tumors and tumorlike lesions of fibrous tissue. In : Enzinger FM, Weiss SW, editors. Soft tissue tumors. 2nd ed. St. Louis: Mosby;1988. p. 102–135.

2. Kang TW, Lee SE, Kim SC. A case of nuchal fibroma. Korean J Dermatol. 2007; 45:168–170.

3. Michal M, Fetsch JF, Hes O, Miettinen M. Nuchal-type fibroma: a clinicopathologic study of 52 cases. Cancer. 1999; 85:156–163.

4. Shek TW, Chan AC, Ma L. Extranuchal nuchal fibroma. Am J Surg Pathol. 1996; 20:902–903.

5. Hameed M, Benevenia J, Blacksin M, Aisner SC. Nuchal fibroma of the shoulder involving skeletal muscle: a radiographic and clinicopathological study. A case report. J Bone Joint Surg Am. 1998; 80:1684–1686.

6. Balachandran K, Allen PW, MacCormac LB. Nuchal fibroma. A clinicopathological study of nine cases. Am J Surg Pathol. 1995; 19:313–317.

7. Dawes LC, La Hei ER, Tobias V, Kern I, Stening W. Nuchal fibroma should be recognized as a new extracolonic manifestation of Gardner-variant familial adenomatous polyposis. Aust N Z J Surg. 2000; 70:824–826.

8. Michal M. Non-nuchal-type fibroma associated with gardner's syndrome. A hitherto-unreported mesenchymal tumor different from fibromatosis and nuchal-type fibroma. Pathol Res Pract. 2000; 196:857–860.

9. Diwan AH, Graves ED, King JA, Horenstein MG. Nuchal-type fibroma in two related patients with Gardner's syndrome. Am J Surg Pathol. 2000; 24:1563–1567.