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Case Report an Exophytic and Symptomatic Lesion of the Labial Mucosa Diagnosed As Labial Seborrheic Keratosis

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Case Report an Exophytic and Symptomatic Lesion of the Labial Mucosa Diagnosed As Labial Seborrheic Keratosis Int J Clin Exp Pathol 2019;12(7):2749-2752 www.ijcep.com /ISSN:1936-2625/IJCEP0093949 Case Report An exophytic and symptomatic lesion of the labial mucosa diagnosed as labial seborrheic keratosis Hui Feng1,2, Binjie Liu1, Zhigang Yao1, Xin Zeng2, Qianming Chen2 1XiangYa Stomatological Hospital, Central South University, Changsha 410000, Hunan, P. R. China; 2State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, Sichuan, P. R. China Received March 16, 2019; Accepted April 23, 2019; Epub July 1, 2019; Published July 15, 2019 Abstract: Seborrheic keratosis is a common benign epidermal tumor that occurs mainly in the skin of the face and neck, trunk. The tumors are not, however, seen on the oral mucous membrane. Herein, we describe a case of labial seborrheic keratosis confirmed by histopathology. A healthy 63-year-old man was referred to our hospital for evalu- ation and treatment of a 2-month history of a labial mass with mild pain. Clinically, the initial impressions were ma- lignant transformation of chronic discoid lupus erythematosus, syphilitic chancre, or keratoacanthoma. Surprisingly, our laboratory results and histopathologic evaluations established a novel diagnosis of a hyperkeratotic type of labial seborrheic keratosis (SK). This reminds us that atypical or varying features of seborrheic keratosis make it difficult to provide an accurate diagnosis. Clinical manifestations of some benign lesions may be misdiagnosed as malignancy. Consequently, dentists should consider this as a differential diagnosis in labial or other oral lesions. Keywords: Seborrheic keratosis, exophytic lesion, symptomatic lesion, labial mucosa, oral mucous membrane Introduction findings were revealed in his medical history, and he had no known allergies to foods or me- Seborrheic keratosis is a common benign epi- dications. The patient reported about a forty- dermal tumor that occurs mainly on the skin of year history of smoking, but no other addic- the face, neck, and trunk [1, 2]. However, the tions. Physical examination revealed an exo- occurrence of seborrheic keratosis on an oral phytic, well-defined lesion in the middle portion mucous membrane is extremely unusual [1, 3, of the lower lip. There were radial short stretch 4]. These tumors are circumscribed and exo- marks around the swelling and tanned blood phytic lesions that are tender and “stuck-on the crusts and a little keratin-like material overlying skin” with a verrucous, rough appearance. Mo- the lesion. The basement of the mass appear- st are asymptomatic, but some lesions may ed to be relatively deep and extensive, but the exhibit signs of malignant transformation such texture was slightly ductile (Figure 1). The re- as rapid growth, itching, erosion, bleeding, or mainder of the oral examination result was pain [5]. Herein, we describe a case of a fast- normal and no skin lesions were detected. growing and symptomatic lesion on the labial Laboratory testing disclosed that the routine mucosa, suggesting malignancy, confirmed as blood count (RBC), blood coagulation, liver and labial seborrheic keratosis. kidney functions, C-reactive protein (CPR), Case report erythrocyte sedimentation rate (ESR), and glu- cagon levels were normal, as were the findings A man in his 60s presented with a 2-month his- from chest radiographs. Moreover, hepatitis B tory of a labial mass with slight itching, focal virus (HBV), human papilloma virus (HPV), hu- erosion, and mild pain. Self-medication with man immunodeficiency virus (HIV), and syphilis Latin cephalosporin capsules provided no im- were determined as negative. Based on medi- provement in his labial lesion. No significant cal history and clinical examination, the initial Symptomatic lesion of labial mucosa diagnosed as labial seborrheic keratosis postoperative scarring, the patient mentioned that no tumor recurrence or other discomfort was found at two and a half years follow-up after labial mass excision (Figure 4). Discussion Seborrheic keratosis is a common benign epi- dermal tumor of the skin in middle-aged and elderly individuals without any sex predilecti- on. The common sites include the skin of the face and neck, trunk, and particularly the inter- scapular areas [1, 2]. However, the occurrence Figure 1. Physical examination revealed a well-cir- cumscribed exophytic lesion in the middle portion of of seborrheic keratosis on oral mucous mem- lower lip. It had overlying tanned blood crusts or little brane is extremely unusual [1, 3, 4]. These keratin-like material, and surrounding radial short tumors are circumscribed and exophytic lesi- stretch marks. ons that are tender and “stuck-on the skin” with a verrucous, rough appearance. Most are as- ymptomatic, but some lesions might exhibit clinical impressions of the malignant trans- signs of malignant transformation such as ra- formation of chronic discoid lupus erythemato- pid growth, itching, erosion, bleeding, or pain sus, syphilitic chancre, or keratoacanthoma we- [5]. Seven major histopathologic variants have re given. Subsequently, an incisional biopsy of been described: acanthotic, hyperkeratotic, cl- the labial lesion was performed. onal, adenoid, irritated, Bowenoid, and mela- noacanthoma. Often, the hyperkeratotic type Surprisingly, the histopathologic examination shows a verrucous appearance with “church revealed pronounced papillomatosis with a “ch- spire” pattern. There is prominent hyperortho- urch-spire” appearance, prominent hyperortho- keratosis, while hyperpigmentation and horn keratosis and squamous hyperplasia (Figure cysts are inconspicuous or absent [1]. Some 2A). The pathologic diagnosis was reported as studies showed that seborrheic keratosis is a labial seborrheic keratosis (Hyperkeratotic ty- hyperproliferative disease with an epidermal pe). Furthermore, special stain tests failed to CK composition and cytokeratin 10 (CK10) is reveal any acid-fast bacilli, and the periodic one of prominent markers of suprabasaloid Figure 2B acid-Schiff stain (PAS) was negative ( , differentiation stages in this disease [6-8]. 2C), suggesting that there were tuberculosis Additionally, Ki67, a cellular marker for prolifer- and fungal infections in the lesions. ation, may be positive in seborrheic keratosis [6]. These clinical and pathologic characteris- After the pathologic diagnosis was provided, we tics play an important role in the differential re-evaluated the patient’s condition. The shar- diagnosis, including actinic keratosis, squa- ply demarcated and tender mass suggested mous or basal cell carcinoma, melanoma, and that this was more likely to a benign tumor, but verruca vulgaris [9-11]. the possibility of an underlying malignant le- sion would not be excluded because of its his- Long-term observation of seborrheic keratosis tory of sudden enlargement and some signs of without symptom is feasible, while the lesions pruritus, erosion, crusting, and pain. Therefore, are mostly removed specially for cosmetic rea- our patient was admitted to the hospital and sons. The common operative therapies of seb- underwent a complete excision of the tumor, orrheic keratosis include surgical resection, which on pathologic examination was consis- cryosurgery, electrodesiccation, curettage and tent with the previous histopathologic diagno- ablative laser [5, 12]. Local or systemic drugs sis of seborrheic keratosis (Figure 3A). Me- such as vitamin D, tazarotene, calcipotriene, anwhile, the significant expression of CK10 dobesilate, ammonium lactate, and imiquimod and Ki67 proteins further proved the above are the alternative treatment methods for seb- diagnosis in our case (Figure 3B, 3C). He was orrheic keratosis [5, 12-14]. These proposed ap- discharged on hospital day 7. In addition to proaches have shown certain curative effects 2750 Int J Clin Exp Pathol 2019;12(7):2749-2752 Symptomatic lesion of labial mucosa diagnosed as labial seborrheic keratosis on seborrheic keratosis, thou- gh none are universally effec- tive and some problems or complications such as scar- ring, hyperpigmentation, and even recurrence may exist [5, 12]. Moreover, an association between seborrheic keratosis and malignant lesions such as squamous cell carcinoma, and malignant melanoma has been proposed [11]. Therefore, regu- lar follow-up is advised. The diversity of labial lesions is one of the diagnostic challeng- es for clinicians. The lesions might indicate a common dis- ease in a highly unusual loca- tion. In some instances, appar- ently indolent lesions demon- strate a diagnosis with a dis- Figure 2. (A) The biopsy revealed prominent papillomatosis with a “church- couraging prognosis. Conver- spire” appearance, hyperorthokeratosis, and squamous hyperplasia. (B) sely, certain fast-growing tu- Acid-Fast stain (AFS) and (C) Periodic acid-Schiff stain (PAS) tests were mors, suggesting malignancy, negative. (Hematoxylin and eosin, 10 × and 100 ×). are in fact benign lesions with favorable outcomes. Our re- port indicated that seborrheic keratosis could occur on oral mucous membranes, although this is an unusual location. Th- is reminds us that atypical or variant features of seborrheic keratosis make accurate diag- nosis difficult. Clinical manifes- tations of some benign lesions may be misdiagnosed as malig- nancy. Consequently, dentists should consider this as a dif- ferential diagnosis in labial or other oral lesions. Acknowledgements We thank the National Natural Science Foundations of China (document No. 81700988, 81- 771081). Figure 3. (A) During labial
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