Laboratory Studies
In the case of malignant spiradenomas, tissue has been tested to determine the presence of hormonal receptors.
Imaging Studies
MRI, CT, and radiography can be used to assess the presence of metastatic foci in the case of malignant spiradenoma.
Han et al[31] noted malignant spiradenomas distributed in several parts of a patient's body. On MRIs, the spiradenomas manifested as multiple dispersive foci with clear circumferences in the skin and subcutis. The spiradenomas demonstrated low-signal intensity on T1-weighted images and high-signal intensity on short tau inversion recovery images. Although the signal intensities of spiradenomas were not characteristic of other benign tumors, malignant spiradenomas should be in the differential diagnosis of the tumors of the skin and the subcutis.
Procedures
A skin biopsy helps in establishing the diagnosis of these tumors. The best and really only treatment is surgical excision of these lesions one at a time.
Fine-needle cytology of a spiradenoma of the breast can be performed to aid in diagnosis.[32]
Histologic Findings
Spiradenomas consist of 1 or more large, sharply delineated, basophilic nodules in the dermis (cannon balls or big blue balls in the dermis). The nodules of spiradenoma are unattached to the epidermis and sometimes extend into the subcutis. The nodules consist of groups of cells in cords, islands, and/or sheets. A trabecular arrangement of cells can be present.
The 2 types of cells in the nodules of spiradenomas are small, dark, basaloid cells with hyperchromatic nuclei and cells with large, pale, vesicular, and ovoid nuclei. Pale cells tend to be at the center of the lesions. Ductlike structures can also be present at the center of the lesions. The lesions are peppered with lymphocytes. Strands of cells are positive for cytokeratin, and the lumina are positive for carcinoembryonic antigen.
Upon electron microscope examination, spiradenomas consist of cellular sheets separated into lobules by strands of amorphous and fibrillar material. Examination reveals translucent polygonal or round cells with mitochondria, small vesicles, and sometimes glycogen granules, which are the dominant population of cells in spiradenomas. Sparse, dark cells are also often noted. Lumina are not always noted, but, when present, they can have microvilli on the lining cells.
Jitsukawa et al[33] performed electron microscopic studies of spiradenomas. Apposite morphologic aspects of the parenchyma were an adenoid cystic organization composed of epithelial, myoepithelial, and nonepithelial cell types; intracytoplasmic lumina were also present in epithelial cells. No evidence indicated that the parenchyma produced any type of secretion. The stroma ramified in and around the parenchyma, occupying extensive areas. The stroma formed tenuous septa of the loose connective tissue that contained embedded blood vessels and nerve fibers. Close examination revealed profiles of cystoid spaces resulting from stromal invagination into the parenchyma.
Meybehm and Fischer[34] noted that spiradenomas and cylindromas express S-100 protein, ascribed to eccrine differentiation within their tubular and large, pale-staining cells.
Tubular cells in both spiradenomas and cylindromas expressed human milk fat globulin and lysozyme, 2 markers associated with apocrine differentiation. In addition, antibodies to alpha–smooth muscle actin tightly mark the small basaloid cells of both spiradenomas and cylindromas.
Both spiradenomas and cylindromas demonstrate identical cytokeratin patterns. As with the sundry aspects of eccrine and apocrine units, the expression of keratins 7, 8, and 18 by spiradenomas and cylindromas demonstrates differentiation in the direction of a parentage from secretory tissue. On the other hand, the expression of keratin 14 in some of the neoplastic cells suggested ductal differentiation.
Ishihara et al[35] have used a novel monoclonal antibody IKH-4, which stains the eccrine secretory coil but not the apocrine secretory segment. They saw positive staining in eccrine hidradenoma, eccrine poroma, spiradenoma, papillary eccrine adenoma, eccrine hidrocystoma, syringoma, eccrine carcinoma, and syringocystadenoma papilliferum (1 case). They noted negative staining in apocrine adenocarcinoma, hidradenoma papilliferum, erosive adenomatosis of the nipple, and primary and metastatic adenocarcinomas. IKH-4 antibody helped researchers differentiate eccrine neoplasms from apocrine neoplasms and eccrine carcinoma from metastatic adenocarcinomas.
Yasui et al[36] noted that DF3 (CA15-3) monoclonal antibody detects the 20–amino acid sequence of epithelial mucin. In normal skin, DF3 antibody reacts strongly and constantly with sebaceous and secretory parts of eccrine and apocrine sweat glands. DF3 stains spiradenomas.
Saboorian et al[37] noted an interesting case of malignant spiradenomas of the breast. Microscopically, the malignant spiradenoma demonstrated the typical features of a spiradenoma, with areas of adenocarcinoma, squamous cell carcinoma, and sarcoma. The sarcomatous component consisted of rhabdomyosarcoma and osteosarcoma. Immunoperoxidase staining demonstrated p53 protein only in carcinomatous and sarcomatous cells.
Kurokawa et al[38] found spiradenomas co-expression of cytokeratin and smooth muscle actin, suggesting differentiation toward myoepithelial cells.
Ko et al[39] noted a giant vascular spiradenoma that occurred in a 56-year-old Korean woman. They noted that the clinical differential diagnosis included an angiomatous lesion, a determination based on its florid vascularity and hemorrhagic manifestations.
Immunohistochemical stainings demonstrated 3 types of cells, specifically (1) pale epithelial cells, (2) small basal cells, and (3) myoepithelial cells.
Ohtsuki et al[40] performed a detailed immunohistochemical analysis on spiradenoma tissue from a 40-year-old woman. Immunohistochemically, antibodies to cytokeratins (AE1/AE3, CAM5.2) and CK 5/6 stained diffusely positive in all tumor cells. The intermingled Langerhans cells did not stain diffusely positive. These Langerhans cells harbored interdigitated nuclei, and their cytoplasm was positive for S-100 protein and CD1a; additionally, their nuclei were occasionally positive for S-100 protein.
In these Langerhans cells, antibody-to-epithelial membrane antigen positively stained for the surface of both intracytoplasmic and true glandular lumina. With fine structural examination, Langerhans cells were noted among the tumor cells, extending fine irregular processes among the tumor cells. Birbeck granules manifested clearly within the cytoplasm of the Langerhans cells. Intracytoplasmic lumina with microvilli on their surfaces occurred in some tumor cells. In these examinations of spiradenoma, 15 Langerhans cells were seen per low-power field.
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