Background
The histogenesis of spiradenomas remains in question, but many lesions demonstrate apocrine differentiation. The term eccrine spiradenoma may join the list of other misnomers in dermatology, including mycosis fungoides and granuloma faciale. Lesions usually manifest as solitary, 1-cm-diameter, gray, pink, purple, red, or blue nodules on the upper half of the ventral side of the body. Spiradenomas can be painful, often in paroxysms. Multiple spiradenomas have been reported. Their initial elaboration is attributed to Kersting and Helwig.[1]
Spiradenomas are usually benign. It can occur in infancy but most commonly arises in persons aged 15-35 years. About 15 cases of linear/zosteriform/nevoid/blaschkoid multiple spiradenomas exist in the literature.[2, 3] About 50 case reports of malignant spiradenoma exist in the literature. Dabska[4] first described malignant spiradenoma in 1972.
Spiradenomas can occur in Brooke-Spiegler syndrome, which manifests with cylindromas, spiradenomas, and trichoepitheliomas. In this syndrome, lesions can have combined features of both cylindromas and spiradenomas.[5, 6]
Pathophysiology
A defective tumor suppressor gene is believed to result in the development of spiradenomas. In Brooke-Spiegler syndrome, of which spiradenomas are a manifestation, the defective gene is the CYLD gene on chromosome 9. Work remains to be performed on the genetic defect causing isolated and sporadic spiradenomas. The CYLD seems to be a hot spot of mutations as novel mutations continue to be reported.[7]
The expression of p53 in malignant spiradenomas seems to be increased.
The cells of origin of spiradenomas appear to have apocrine and trichoepitheliomatous differentiation, ie, they have complex hair follicle (folliculosebaceous apocrine) differentiation rather than eccrine differentiation.
In cases of linear/zosteriform/nevoid/blaschkoid multiple spiradenomas, an abnormal clone arising during embryogenesis is postulated to produce the multiple abnormal cells that result in such spiradenomas.
In a cytogenetic study, Dijkhuizen et al[8] found a spiradenoma and 2 lymph node metastases, with a growth pattern and microscopic appearance typical for benign spiradenoma, a 46,XY-5,del(16)(q22),+mar(t(?;5)(?::5q13----5qter)) karyotype.
These similar genetic defects seem to support a relationship between the chromosomal abnormalities and the clinical malignant action of this benign-appearing neoplasm.
Epidemiology
Frequency
Spiradenomas are rare worldwide. Malignant spiradenomas are very rare worldwide.
Mortality/Morbidity
Spiradenomas can be painful. The rate of malignant transformation is very low, and, sometimes, malignant transformation has been reported to develop spontaneously. The rate of metastasis is about 50% and can result in death.
Race
No racial link exists for spiradenomas.
Sex
No sexual predilection exists for spiradenomas or malignant spiradenomas.
Age
Spiradenomas have been reported to arise in infancy but this is rare. However, most spiradenomas arise in persons aged 15-35 years. Malignant spiradenomas tend to develop after age 50 years. Malignant spiradenomas presents at an average age of 59 years (range, 21-92 y).
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