Papillary eccrine adenoma

A 28-year-old man came to us with a solitary skin colored, mildly tender nodule of 6 months duration on the dorsum of the right hand. On histological examination, multiple dilated ducts without apparent continuity with the surface were found in the dermis. These dilated ducts had branching tubules with eosinophilic amorphous material filling most of the lumina. The peripheral cells of the tubules resembled myoepithelial cells, whereas the luminal border cells were cuboidal or low columnar. Papillary projections arising from the inner cells were seen extending into the lumen. These features were diagnostic of a rare tumor, papillary eccrine adenoma.     

Papillary eccrine adenoma. A histopathological and immunohistochemical study

A case of papillary eccrine adenoma of the thigh of a 63-year-old woman is reported. Histologically, the tumor was composed of cystic dilated and branching tubular structures with papillary projections into the lumen, surrounded by a fibrous stroma. In addition, in some areas it was composed almost exclusively of solid strands of epithelial cells. The tumoral eccrine differentiation was assessed by immunohistochemical studies. Problems of differential diagnosis with low-grade sweat gland carcinoma and with tubular apocrine adenoma are discussed.     

Papillary eccrine adenoma. Immunohistochemical and ultrastructural analyses

A case of papillary eccrine adenoma was analysed with immunohistochemical and ultrastructural methods regarding their direction of differentiation. It was found that the majority of the structures show either eccrine ductal or glandular differentiation. There were some segments, particularly in those exhibiting papillary growth, where cells similar to eccrine secretory (clear) cells or cells with characteristics of both ductal basal cells and glandular myoepithelial cells were present.     

Papillary eccrine adenoma: an electron microscopic study

A case of papillary eccrine adenoma was studied by electron microscopy. Dilated ducts that contained granular eosinophilic material, often associated with intraluminal papillary projections were observed. The ductlike structures were composed of basal and luminal cells. Within the luminal cells there were intracytoplasmic cavities, but neither secretory granules nor glandular structure were observed. On the basis of our observations, papillary eccrine adenoma appears to differentiate toward ductal structures of the eccrine sweat apparatus.     

Papillary eccrine adenoma: immunohistochemical studies of keratin expression

Despite various studies, there are serious disagreements about the cellular differentiation of papillary eccrine adenoma. In the present study, 2 specimens of papillary eccrine adenoma were analyzed by immunohistochemical techniques, using a panel of monoclonal antibodies against keratins, to elucidate its differentiation. Histopathologically, the tumor was composed of multiple tubular structures lined by two or more layers of epithelial cells. The luminal cells of the tubules were flattened or cuboidal. The former were noted in large dilated tubules. The latter were usually observed in small-to-moderate-sized tubules, and formed intra-luminal papillary projections in some tubules. Immunohistochemically, there were two kinds of cuboidal cells in the luminal layers of the tubules. Most of the large dilated tubules and some of the small-to-moderate-sized tubules expressed immunophenotypes similar to those of the eccrine dermal duct. The other tubular structures, including the small tubules resembling those of syringoma, expressed immunophenotypes similar to those of the transitional portions between the dermal ducts and the secretory segments of eccrine glands. From the above comparative studies, papillary eccrine adenoma is considered to differentiate towards the dermal duct and the transitional portions between the dermal ducts and the secretory segments of eccrine glands.     

Papillary eccrine adenoma: Immunohistochemicai study and literature review

A case of papillary eccrine adenoma on the right forearm of a 78-year-old Japanese woman is reported. The tumor was 1.3 cm in diameter, occupying the whole thickness of the dermis. Histologically, the tumor was composed of dilated tubules of various sizes with intraluminal papillary projections, and was surrounded by a fibrous stroma. An immunohistochemical study revealed that the proliferating tubules were composed of a single outermost layer of α-smooth muscle actin-and keratin 14-positive myoepithelial cells, and keratin 8-positive inner cells. This antigen expression pattern was comparable to that of the normal eccrine secretory coil, which indicates that the tumor differentiated toward the secretory coil of an eccrine sweat gland.     

Mixed tubulopapillary hidradenoma and syringocystadenoma papilliferum occurring as a verrucous tumor

Tubulopapillary hidradenoma (TPH)1 is a term proposed to describe morphological dermal ductal tumors with both eccrine and apocrine differentiation. The term TPH encompasses a spectrum of lesions that includes tubular apocrine adenoma (TAA) and papillary eccrine adenoma (PEA):2 PEA and TAA can be indistinguishable both clinically and histologically. We described a case of TPH with both prominent eccrine and apocrine differentiation combined with syringocystadenoma papilliferum (SCAP) over the distal extremity. This rarely encountered dermatopathological phenomenon is the sixth reported case from the literature in which PEA or TAA and SCAP were present in the same lesion.3-7 Furthermore, the tumor had a warty surface, which is histologically consistent with a typical viral verruca. Although PCR and DNA probe hybridization for human papilloma virus (HPV) types 2, 6/11, 16 and 18 failed to reveal positive results, the location and clinicopathologic correlation convinced us that superimposed HPV could not be excluded.     

皮脂腺痣并发乳头状汗管囊腺瘤及管状乳头状顶泌汗腺腺瘤

报告1例皮脂腺痣并发乳头状汗管囊腺瘤及管状乳头状顶泌汗腺腺瘤.患者女,26岁.因右侧头皮黄色无毛斑块26年就诊.体格检查示右侧头皮黄色无毛斑块,边界清楚,表面粗糙,局部糜烂渗液.组织病理检查示表皮疣状增生,皮脂腺和顶泌汗腺增生.一部分顶泌汗腺与表皮相连,形成乳头状突起,其间质中有较多浆细胞浸润;另一部分顶泌汗腺位于真皮深部,不与表皮相连,形成较多管腔样结构,管腔内见顶泌汗腺呈乳头状突入管腔.结合临床资料及组织病理学改变,本病为1例罕见的皮脂腺痣并发乳头状汗管囊腺瘤及管状乳头状顶泌汗腺腺瘤.     

A single lesion showing features of pigmented eccrine poroma and poroid hidradenoma

Poroid hidradenoma (PH) is a variant of poroma. This entity was defined by Abenoza and Ackerman in 1990. This neoplasm shows architectural characteristics of hidradenoma (tumor cells confined entirely within the dermis in both solid and cystic components) and cytologic characteristics of poroid neoplasm (poroid and cuticular cells, the latter showing ductal differentiation). We herein document a case of single poroid lesion with the features of both eccrine poroma and PH. The patient was a 55-year-old woman with a pigmented nodular lesion on her upper back for 7 years. The histopathologic features of the lesion were consistent with those of eccrine poroma and PH. Unlike most eccrine poromas, this case was pigmented, clinically and microscopically.     

Tubular apocrine adenoma and papillary eccrine adenoma. Entities or unity?

A case of a tubulopapillary hidradenoma was studied by light and electron microscopy and by immunohistochemistry. The tumor, the first reported from the axilla, demonstrated both eccrine and apocrine differentiation and may have arisen from the recently described apoeccrine gland located at this site.     

Basal cell tumor with eccrine differentiation (eccrine epithelioma)

A case of eccrine epithelioma is presented. A 62-year-old woman was seen for with a lesion on the left forearm present for 36 years, and complicated by multiple recurrences. Histopathologically, it was composed of numerous small nests of basaloid cells, cystic and syringoid epithelial structures within the reticular dermis and invading the contiguous fat mid muscle tissues. Tubular structures and cystic spaces contained PAS-positive, diastate-resistant, and alcian blue-positive material. Although the tumor was very aggressive locally, no metastasis had occurred throughout its long course.     

Penile basal cell carcinoma with eccrine differentiation

Basal cell carcinoma (BCC) is rare on the penis. There have been only 17 cases of penile BCC reported in the literature. Eccrine differentiation may not be uncommon in BCC but has not been reported in penile BCC. We report here a 75-year-old man with multiple penile BCC with histological features of eccrine differentiation. A brief review of the literature is included.