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Proliferating trichilemmal tumors: CT and MR imaging findings in two cases, one with malignant transformation.

Authors
  • Kim, H J
  • Kim, T S
  • Lee, K H
  • Kim, Y M
  • Suh, C H
Type
Published Article
Journal
AJNR. American journal of neuroradiology
Publication Date
Jan 01, 2001
Volume
22
Issue
1
Pages
180–183
Identifiers
PMID: 11158906
Source
Medline
License
Unknown

Abstract

We report the imaging findings in two patients with proliferating trichilemmal tumors. In the first patient, the tumor arose on the lower lip, a very unusual location for this type of tumor, and showed malignant transformation with metastasis to a regional lymph node. It was seen as a poorly marginated soft-tissue mass with isointense signal on T1-weighted MR images and hyperintense signal on T2-weighted images. Large areas of high signal intensity caused by necrosis were also found within the tumor on T2-weighted images. After i.v. administration of contrast material, the mass showed significant enhancement, with considerable portions remaining unenhanced. In the second patient, the tumor originated from a preexisting trichilemmal cyst and occurred in the hair-bearing area of the posterior part of the neck. CT scans showed a well-encapsulated cystic mass that contained multiple speckled calcifications in a wall of variable thickness. There were several foci of smooth soft-tissue elevations from the inner wall of the mass, which corresponded histologically to proliferating portions of trichilemmal cyst.

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