Syringocystadenoma papilliferum in an unusual location beyond the head and neck region: A case report and review of literature
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Syringocystadenoma papilliferum in an unusual location beyond the head and neck region: A case report and review of literature1. Department of Dermatology, Hospital Kuala Lumpur, Kuala Lumpur, Malaysia. firstname.lastname@example.org
Felix Boon-Bin Yap MD MRCP1, Bang Rom Lee MBBS MMed2, Roshidah Baba MBBS FRCP1
Dermatology Online Journal 16 (10): 4
2. Department of Pathology, Faculty of Medicine and Health Science, Universiti Putra Malaysia, Selangor Darul Ehsan, Malaysia
A case of syringocystadenoma papilliferum with multiple papulonodules in a linear fashion located in an unusual location of the right lower abdomen is presented. The presence of a large tumor at the inferior pole raised the suspicion of malignant transformation and the presence of discharge from the lesions raised the possibility of necrosis. However, histopathological examination showed the classical features of syringocystadenoma papilliferum without malignant transformation or tumor necrosis. The patient refused to undergo surgical excision of the nodules and subsequently was lost to follow-up. This case illustrates the atypical location of a rare disease and adds to the differential diagnosis of linear verrucous lesions on the abdomen. Review of all the cases with syringocystadenoma papilliferum outside the head and neck region in the English literature showed only one case of syringocystadenoma papilliferum arising on the abdomen; our patient is the second reported case with the unique feature of linear arrangement of lesions.
Syringocystadenoma papilliferum is a benign hamartomatous adnexal tumor. The histogenesis of this rare neoplasm is still unclear. It is theorized that syringocystadenoma papilliferum arises from the pluripotent cells of apocrine lineage . The tumor may occur de novo or within a nevus sebaceus . Most patients present with a solitary lesion in the head and neck region at birth or in early childhood [2, 3]. Presentation with multiple lesions is rare; those arising outside the head and neck region are even more uncommon. We present a case of syringocystadenoma papilliferum with multiple verrucous lesions, arranged in a linear fashion and located in the unusual site of the lower abdomen.
A 40-year-old woman presented with multiple nontender and nonpruritic verrucous papules and nodules on the right lower abdomen. She had these lesions since birth and they had gradually increased in number and size over the years. Currently, she presented with a 6-month history of progressive enlargement of the eruption, associated with foul smelling discharge. She admitted to have applied traditional topical treatment to the lesions. There were no associated systemic symptoms. She also had type 2 diabetes mellitus, for which she was taking oral metformin 750 mg twice daily. In addition, she had hypertension for which she was taking oral amlodipine 5 mg daily for the past 2 years.
On examination, multiple erythematous papules and nodules were observed on the right lower abdomen arranged in a linear fashion (Figures 1 and 2). These papules and nodules measured up to 1.5 cm in diameter with the largest on the inferior pole measuring 5 cm in diameter. Erosion was seen on the surface of some of the lesions. There was also yellowish creamy foul smelling discharge.
Two incisional skin biopsies were performed, one on the largest tumor and another on a small nodule. The histopathological examinations of both biopsies showed the presence of multiple cystic, papillary, and ductal invaginations extending into the dermis. These invaginations were connected to the epidermis, which showed acanthosis and papillomatosis (Figure 3). Double layers of cells consisting of an inner layer of cuboidal cells and an outer luminal layer of tall columnar cells were seen lining the invaginations (Figure 4). Decapitation secretion was seen in the luminal layer (Figure 4). The connective tissue core was filled with plasma cells. There were no histological features of nevus sebaceus or epidermal nevus. The histological findings were consistent with the diagnosis of syringocystadenoma papilliferum.
Culture of the discharge from the lesions grew Pseudomonas aeruginosa and she was treated with oral ciprofloxacin and intravenous amikacin for 2 weeks. The patient was later seen in the combined dermatology-plastic surgery consultation and was offered surgical excision with skin grafting. However, she refused the surgical treatment and instead opted for traditional Malay therapy. She also refused to be patch tested to the traditional topical medications she had used for the skin lesions. She subsequently was lost to follow-up.
Since the first description by Stokes in 1917 under the term nevus syringadenomatosus papilliferus, syringocystadenoma papilliferum has been increasingly reported in the English literature . The majority of the reported cases had lesions in the head and neck region. Mammino et al. reviewed 145 cases with syringocystadenoma papilliferum and found 108 cases (75.0%) occurring on the head and neck region, 29 cases (20.0%) on the trunk, and 8 cases (5.0%) on the extremities . However, over the past two decades there are increasing reports of syringocystadenoma papilliferum occurring in unusual locations outside the head and neck region.
We reviewed the English literature for cases of syringocystadenoma papilliferum outside the head and neck region and found 69 cases with such characteristics (Table 1). There were 67 cases with syringocystadenoma papilliferum in one body location and 2 cases with the tumor in 2 different body locations. There were 38 (53.5%) syringocystadenoma papilliferum tumors seen on the trunk, 24 (33.8%) on the extremities, and 9 (12.5%) on the genitalia. Of the 38 neoplasms on the trunk, 3 tumors were reported on the breast, 2 on the back, 1 on the abdomen, 1 on the chest, and 31 on the trunk (not specified). On the extremities, 9 were reported on the lower limbs, 3 on the upper limbs, 2 on the buttocks, and 10 on the limbs (not specified). On the genitalia, 5 syringocystadenoma papilliferum were seen on the vulva and 4 on the scrotum. The sizes of the skin lesions ranged from 5 to 160 mm. There were 13 cases (18.8%) that had the lesions since birth. Associated lesions were seen in 12 cases (17.3%). These associated lesions included viral warts, nevus sebaceus, linear nevus verrucosus, nevus comedonicus, apocrine poroma, apocrine hidrocystoma, tubulopapillary hidradenoma, hidradenoma papilliferum, papillary eccrine adenoma, verrucous carcinoma, and syringocystadenocarcinoma papilliferum.
To date, there is only one reported case of syringocystadenoma papilliferum arising on the abdomen . That 65-year-old Japanese man had syringocystadenoma papilliferum associated with apocrine poroma for 4 years prior to his presentation. In contrast our patient had the lesions since birth with no associated skin lesion. Moreover, there were multiple lesions arranged in a linear fashion in our patient compared to a solitary ulcerated lesion in the elderly man.
Syringocystadenoma papilliferum presents as a brownish or erythematous papule, nodule, or tumor of varying sizes. The surface can be smooth, flat, papillomatous, or verrucous . Most patients present with a solitary lesion. However, if there are multiple papules, they tend to be arranged in a linear configuration . The latter lesions are usually associated with nevus sebaceus . Syringocystadenoma papilliferum is also associated with apocrine poroma, apocrine acrosyringeal keratosis, apocrine hidrocystoma, tubular apocrine adenoma, papillary eccrine adenoma, eccrine nevus, tubulopapillary hidroadenoma, hidroadenoma papilliferum, poroma folliculare, linear nevus verrucosa, atypical fibroxanthoma, clear cell syringoma, basal cell epithelioma, sebaceous epithelioma, trichoepithelioma, verruca vulgaris, and nevus comedonicus [10, 17, 20, 23, 26, 30-38]. Fujita et al noted that the most common associated lesion is nevus sebaceus (31.7%) followed by basal cell epithelioma (10.3%), sebaceous epithelioma (3.2%), apocrine hidrocystoma (3.2%), trichoepithelioma (1.6%), and eccrine spiradenoma (0.8%) .
Clinically, the differential diagnoses of these linear lesions include linear epidermal nevus, nevus comedonicus, basaloid follicular hamartoma, cylindroma, and eccrine nevus . Other possible diagnoses include verrucous carcinoma, viral warts, pyogenic granuloma, subcutaneous fungal infection, tuberculosis verrucosa cutis, and giant lymphangioma .
Histopathological examination of syringocystadenoma papilliferum frequently shows multiple cystic invaginations in a background of fibrous tissue. The upper regions of the cystic invaginations are commonly lined by keratinizing squamous epithelial cells whereas the lower regions, which contain papillary projections, are lined by glandular epithelium. These papillary projections are the most characteristic pattern . The glandular epithelium is lined by two layers of cells namely the tall columnar cells at the luminal surface and the cuboidal cells at the base. Decapitation secretion or “apical snouts” are often seen at the luminal surface. Another diagnostic feature of this neoplasm is the presence of mononuclear inflammatory infiltrates consisting of mainly plasma cells in the fibrous tissue of the papillary projections . Positive staining in the luminal cells for alcian blue, colloidal iron, and periodic acid-Schiff (PAS), which is diastase resistant, favor the apocrine differentiation of this tumor [40, 41]. Moreover, the positivity for immunohistochemical staining of gross cystic disease fluid protein 15 (GCDFP-15; BRST 2), Leu-M1 antigen (CD 15), lysozymes, carcinoembryonic antigen (CEA), and epithelial membrane antigen (EMA) further support the theory of apocrine origin [4, 15, 42, 43]. Nevertheless, there are also some studies that showed an eccrine differentiation of the neoplasm [44, 45]. Thus, the jury is still out on the etiology of this benign tumor.
The development of the large tumor on the inferior pole in our patient was worrisome because of the possibility of malignant transformation. Syringocystadenoma papilliferum is associated with malignant tumors such as verrucous carcinoma, basal cell carcinoma, sebaceus carcinoma and ductal carcinoma [6, 7, 8]. Syringocystadenocarcinoma papilliferum, a malignant counterpart of syringocystadenoma papilliferum, can also arise in the benign hamartoma . Fortunately, there were no features to suggest malignant change in the histopathological examination of our patient.
Another interesting note in our patient was the foul smelling discharge from the syringocystadenoma papilliferum. We suspect that this was a secondary skin infection associated with the allergic contact dermatitis caused by the application of traditional topical treatment. There was also the possibility of spontaneous necrosis of the syringocystadenoma papilliferum lesions giving rise to the discharge. However, we did not detect any features of necrosis on the histopathological examination to support this theory.
In conclusion, we have added another case of linear syringocystadenoma papilliferum in an unusual location beyond the head and neck region. Syringocystadenoma papilliferum must be included in the differential diagnosis of linear verrucous lesions on the abdomen.
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