PT  - JOURNAL ARTICLE
AU  - Kim, Hyung-Jin
AU  - Kim, Tae Sook
AU  - Lee, Kyung-Hee
AU  - Kim, Young Mo
AU  - Suh, Chang Hae
TI  - Proliferating Trichilemmal Tumors: CT and MR Imaging Findings in Two Cases, One with Malignant Transformation
DP  - 2001 Jan 01
TA  - American Journal of Neuroradiology
PG  - 180--183
VI  - 22
IP  - 1
4099  - http://www.ajnr.org/content/22/1/180.short
4100  - http://www.ajnr.org/content/22/1/180.full
SO  - Am. J. Neuroradiol.2001 Jan 01; 22
AB  - Summary: 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 IV 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.