Undifferentiated Sarcoma as Intermediate Step in the Progression of Malignant Melanoma to Rhabdomyosarcoma: Histologic, Immunohistochemical, and Molecular Studies of a New Case of Malignant Melanoma With Rhabdomyosarcomatous Differentiation.

Malignant melanoma (MM) may display highly variable phenotypic diversity, sometimes associated with loss of immunohistochemical melanocytic markers and acquisition of nonmelanocytic lineage of differentiation. Primary cutaneous MM with rhabdomyosarcomatous differentiation is extremely rare with only 5 reported cases in the literature. To date, a chronological progression of a MM to rhabdomyosarcoma has not been conclusively documented. A 96-year-old man underwent a re-excision of an "atypical fibroxanthoma" of the forearm, which revealed a small lentigo maligna melanoma associated with a dominant dermal high-grade spindle cell nodule admixed with a population of malignant polygonal epithelioid cells. On immunohistochemical studies, the spindle cells were completely negative for all melanocytic markers, whereas a small population of polygonal neoplastic cells at the periphery was positive for Desmin and Myo-D1, supporting early rhabdomyosarcomatous transformation. Several subsequent re-excisions demonstrated merely nodules of malignant pleomorphic epithelioid cells with rhabdomyosarcomatous differentiation and devoid of melanocytic markers. In addition, both rhabdomyosarcomatous component and original MM displayed identical mutations. Therefore, the histologic, immunohistochemical, and molecular findings documented for the first time a chronological progression from an invasive MM to a pleomorphic rhabdomyosarcoma through an intermediate stage of undifferentiated sarcoma/atypical fibroxanthoma. Interestingly, subsequent recurrences of pure rhabdomyosarcomatous component displayed skip lesions/microsatellitosis, marked tumor-infiltrative lymphocytes, and rare junctional nests of rhabdomyosarcomatous cells in the epidermis, histologic features that were not described in primary cutaneous rhabdomyosarcoma and therefore could serve as morphologic clues to the diagnosis of rhabdomyosarcomatous transformation in an MM.

Beta Human Papillomavirus Infection Is Prevalent in Elephantiasis and Exhibits a Productive Phenotype: A Case-Control Study.

Elephantiasis is considered a cutaneous region of immune deficiency with cobblestone-like surface caused by a wart-like eruption. Verrucosis is a diffuse human papillomavirus (HPV) infection linked to immunodeficiency disorders. The objective of this study was to examine the prevalence of HPV infection in lymphedema and its pathogenic role in elephantiasis. A retrospective case-control study was performed examining lymphedematous skin and controls of peritumoral normal skin. HPV infection was evaluated at the DNA, protein, and histopathologic levels by polymerase chain reaction, immunohistochemistry, and light microscopy, respectively. Overall, 540 HPV DNAs were detected in 120 of 122 cutaneous samples (median 4 HPV DNAs per sample, range 0-9). Compared with controls, no differences existed in type or number of HPVs identified. Instead, a diverse spectrum of HPV-related histopathologies were evident, likely reflecting the multiplicity of HPV genotypes detected. Most notably, increasing histopathologic lymphedema stage significantly correlated with markers of productive HPV infection such as altered keratohyaline granules and HPV L1 capsid expression. Limitations of this study are the absence of normal skin controls not associated with neoplasia or subclinical lymphedema, and lack of assessment of HPV copy number per keratinocyte infected. In conclusion, productive HPV infection, not HPV type or numbers detected, distinguished lymphedematous skin from controls. These findings support the theory that lymphedema creates a region of depressed immunity that permits productive HPV infection, manifested clinically by diffuse papillomatosis, characteristic of elephantiasis.

Erythema Nodosum Leprosum-Like Lesions Are a Histopathologic Pattern in Whipple's Disease and a Sign of the Immune Reconstitution Inflammatory Syndrome: A Case Series and Review of the Literature.

Inflammatory and subcutaneous nodules can arise in treated and untreated cases of Whipple disease (WD). The inflammatory immune reconstitution syndrome describes paradoxical clinical inflammatory worsening of a preexisting condition because of a return of immune function. Clinicopathologic examination of 4 patients with WD who presented with erythema nodosum leprosum (ENL)-like lesions and the findings of a systematic review of this phenomenon revealed that ENL-like lesions occurred in predominantly middle-aged male patients who suffered from WD, mostly on the legs. Patients showed a nonvasculitic, mostly septal panniculits with neutrophils, macrophages, and lymphocytes. Numerous bacteria-laden periodic acid-Schiff + macrophages and free bacilli were detected in the dermis, as well as subcutaneous septae and adipose lobules. These lesions occurred in both untreated and treated patients as part of inflammatory immune reconstitution syndrome. In conclusion, ENL-like lesions represent a characteristic histopathologic pattern associated with WD, which can occur in different contexts whenever there is a change in the immunological status of the patient. This change can be triggered by antimicrobial treatment, immunomodulatory and immunosuppressant therapy, or occur spontaneously, rarely.

A Pathological Analysis of Canaliculitis Concretions: More Than Just Actinomyces.

Purpose. Canaliculitis is classically associated with Actinomyces species, which are filamentous bacteria; the purpose of this study was to evaluate the extent to which nonfilamentous bacteria colonize canalicular concretions by using graded histopathological analysis. Methods. This is a series of 16 cases. The percentage of Gram-positive/Gomori's methenamine silver-positive filamentous bacteria (Actinomyces) versus the total bacteria identified was graded, and the types of bacteria seen were recorded. Nonfilamentous bacteria were categorized based upon Gram stain (positive or negative) and morphology (cocci or rods). Results. There were 11 females and 5 males. Nonfilamentous bacteria were identified in 16 of 16 (100%) specimens and filamentous bacteria were identified in 15 of 16 (94%) specimens. The mean percentage of filamentous bacteria relative to total bacteria was 57%. Regarding the nonfilamentous bacteria present, 69% of specimens had Gram-positive cocci only, 25% had Gram-positive and Gram-negative cocci, and 6% had Gram-positive cocci and Gram-positive rods. Conclusion. In the current study, there was a mix of filamentous and nonfilamentous bacteria in almost all canalicular concretions analyzed. Nonfilamentous bacteria may contribute to the pathogenesis of canaliculitis. In addition, the success of bacterial culture can be variable; therefore, pathological analysis can assist in determining the etiology.

Neutrophilic Dermatosis Limited to Lipo-Lymphedematous Skin in a Morbidly Obese Woman on Dasatinib Therapy.

Neutrophilic dermatosis (ND) confined to postmastectomy lymphedema, localized Sweet syndrome, is a newly recognized disease. In this study, the authors describe a 44-year-old obese woman with chronic myelogenous leukemia in molecular remission on dasatinib therapy, who presented with a painful urticarial eruption limited to lipo-lymphedematous skin and accompanied by malaise, episodic fever, diarrhea, neutrophilia, and leukocytosis. Initially transient and migratory, the rash became fixed, papular, and vesicular and showed minimal response to corticosteroids. Biopsy demonstrated sparse perivascular and interstitial dermal neutrophilic infiltrates, without vasculitis or significant dermal edema. Aggregates of neutrophils were found within and surrounding lymphangiectases. Biopsy of a new onset papule 3 weeks later demonstrated papillary dermal edema, denser neutrophilic infiltrate, and vasculitis-like changes. These 2 histopathologic patterns of ND, early and late, resemble neutrophilic urticarial dermatitis (also known as neutrophilic dermatitis with systemic inflammation) and Sweet syndrome, respectively. Extensive workup did not reveal evidence of relapsed chronic myelogenous leukemia, infection, or a coexisting systemic inflammatory disease. Dasatinib was discontinued and the eruption gradually resolved over 2.5 months. Still in molecular remission (no detectable BCR-ABL gene fusion), dasatinib therapy was recommenced at 3-month follow-up. After 10 months, she complains of malaise and arthralgia, but no cutaneous symptoms. The evolution and slow resolution of this ND in lipo-lymphedematous skin implicate poor lymphatic clearance of factors, antigenic and/or toxic, involved in the pathogenesis of ND.

Circumscribed cicatricial alopecia due to localized sarcoidal granulomas and single-organ granulomatous arteritis: a case report and systematic review of sarcoidal vasculitis.

Vasculitis associated with sarcoid granulomas is an uncommon phenomenon. A 72-year-old female presented with an expanding region of circumscribed alopecia and scalp atrophy of 2 months duration. Biopsy showed non-caseating granulomas, dermal thinning, loss of follicles, fibrosis and muscular vessels disrupted by mixed lymphocyte, macrophage and giant-cell infiltrates. Affected vessels had loss and fragmentation of the elastic lamina, fibrous replacement of their walls and luminal stenosis (endarteritis obliterans). Dermal and vascular advential intralymphatic granulomas and lymphangiectases were found by D2-40 expression, suggesting lymphatic obstruction and poor antigen clearance. No evidence of a post-zoster eruption, systemic sarcoidosis or systemic giant-cell arteritis was found. Two years later, prednisone had halted - but not reversed - progression of her alopecia. Review of the literature showed two types of vasculitis associated with sarcoid granulomas: (i) acute, self-limited leukocytoclastic vasculitis and (ii) chronic granulomatous vasculitis (GV). Persistence of non-degradable material or antigen contributes to the pathogenesis of granulomatous inflammation. In this case, lymphatic obstruction probably impeded clearance of nonimmunologic and/or immunologic stimuli permitting and sustaining the development of sarcoid granulomas and sarcoid GV, ultimately causing scarring alopecia and cutaneous atrophy.

Polyarteritis Nodosa Presenting as Digital Gangrene and Breast Lesion following Exposure to Silicone Breast Implants.

Polyarteritis nodosa (PAN) is a rare systemic necrotizing vasculitis of small and medium sized arteries. We report a case of a 49-year old woman who presented with PAN following exposure to silicone breast implants. Although the relationship between silicone implants and connective tissue diseases has been investigated in the literature, no prior reports were found documenting PAN after silicone mammoplasty. While the pathogenesis of idiopathic PAN is not known yet, responsiveness to immunosuppressive therapy may suggest an immunologic mechanism. More robust research is needed to understand the connection between silicone breast implants and autoimmunity.

Primary cutaneous marginal zone lymphoma associated with juxta-articular fibrotic nodules in a teenager.

Primary cutaneous marginal zone lymphoma (PCMZL) has rarely been reported in teenagers and is occasionally associated with Borrelia burgdorferi infection. Juxta-articular fibrotic nodules represent a unique, localized fibrosing response to spirochete infections, namely Borreliosis. Herein, we report a 15-year-old healthy boy who presented with a 4-year history of progressive acquisition of asymptomatic, erythematous nodules, ≤ 3 cm, beginning with his right forearm (3), then right arm (1) and lastly his right inner thigh (1). Biopsy showed PCMZL in three of five samples, and inflamed, fibrotic nodules, near the elbow in two. The bottom heavy lymphomatous nodules consisted of mostly small CD20+ CD43+ lymphocytes, some with plasmacytoid features. Mature plasma cells were lambda light chain restricted by in situ hybridization. The juxta-articular fibrotic nodules were located in the deep dermis and subcutis, had peripheral plasma cell-rich infiltrates, and showed nodular sclerosis (morphea profunda-like) in one, and lamellar and angiocentric sclerosis in the other reminiscent of quiescent lesions of chronic localized fibrosing leukocytoclastic vasculitis. Immunohistochemistry for B. burgdorferi revealed rare positive organisms; however, polymerase chain reaction (PCR) and serology were negative for B. burgdorferi as were serologic and/or PCR assays for Bartonella henselae, Ba. quintana, Ehrlichia chaffeensis, Treponema pallidum, Helicobacter pylori and Babesia microti. No evidence of extracutaneous disease was found by the review of systems and imaging studies. A 4-week trial of doxycycline therapy failed, whereas intralesional (IL) corticosteroid therapy induced rapid regression of his nodules. After two local recurrences, also treated with IL corticosteroids, he is well, without cutaneous disease, 20 months later. A literature review of 19 pediatric cases PCMZL reveals a similar natural history as adult PCMZL. Despite negative serology and PCR for B. burgdorferi, the occurrence of ipsilateral juxta-articular fibrotic nodules, positive B. burgdorferi immunohistochemistry and rapid response to IL corticosteroids implicate the presence of a replicative or non-replicative infectious (spirochetal) antigen in the initiation and promotion of this teenager's PCMZL.

Role of TRPM in melanocytes and melanoma.

Transient receptor potential (TRP) cation channel superfamily plays important roles in variety cellular processes including polymodal cellular sensing, cell adhesion, cell polarity, proliferation, differentiation and apoptosis. One of its subfamilies are TRPM channels. mRNA expression of its founding member, TRPM1 (melastatin), correlates with terminal melanocytic differentiation and loss of its expression has been identified as an important diagnostic and prognostic marker for primary cutaneous melanoma. Because TRPM1 gene codes two transcripts: TRPM1 channel protein in its exons and miR-211 in one of its introns, we propose a dual role for TRPM1 gene where the loss of TRPM1 channel protein is an excellent marker of melanoma aggressiveness, while the expression of miR-211 is linked to the tumor suppressor function of TRPM1. In addition, three other members of this subfamily, TRPM 2, 7 and 8 are implicated in the regulation of melanocytic behaviour. TRPM2 is capable of inducing melanoma apoptosis and necrosis. TRPM7 can be a protector and detoxifier in both melanocytes and melanoma cells. TRPM8 can mediate agonist-induced melanoma cell death. Therefore, we propose that TRPM1, TRPM2, TRPM7 and TRPM8 play crucial roles in melanocyte physiology and melanoma oncology and are excellent diagnostic markers and theraputic targets.

Alpha-interferon secreting blastic plasmacytoid dendritic cells neoplasm: a case report with histological, molecular genetics and long-term tumor cells culture studies.

We report a new case of blastic plasmacytoid dendritic cell neoplasm (BPDCN) with extensive immunophenoptyping, genotyping (karyotype, array-comparative genomic hybridization, and fluorescent in situ hybridization), and long-term tumor cells culture. BPDCN is a very rare and aggressive disease clinically characterized by a skin revealing localization more or less rapidly disseminating to the bone marrow and other organs with or without and leukemia. The disease was initially phenotypically characterized by the expression of both CD4 and CD56 antigens, whereas lymphoid and myeloid lineage antigens were negative. A phenotypic link with alpha-interferon (IFN-I)-producing plasmacytoid dendritic cells was demonstrated. The data collected in this case report provide additional biological and genotypical data on tumor cells of BPDCN. This study confirms the capability of tumor cells to secrete IFN-I, demonstrated by biological IFN-I activity of cultured cells and immunohistochemical expression of Mx-1 protein. Although a common genetic profile involving chromosomes 5, 6, 9, 12, 13, and 15 has been identified, no specific genetic marker has been demonstrated that is specific to BPDCN. The demonstration of ETV6 gene deletion in this case deserves further investigations as a putative BPDCN marker.

The evolution of osseous metaplasia in localized cutaneous nephrogenic systemic fibrosis: a case report.

Gadolinium (Gd) is associated with nephrogenic systemic fibrosis (NSF), a severe disorder mimicking scleroderma with involvement of the skin, lungs, heart, liver, and muscles. There is strong evidence that specific Gd-containing contrast agents (GCCAs) used in magnetic resonance imaging can cause NSF when administered to patients with chronic kidney disease. We present the 8-year history of cutaneous NSF with osseous metaplasia that occurred in a 56-year-old man with dialysis-dependent renal failure who was exposed to GCCA [gadopentate dimeglumine (Magnevist; Bayer Schering Pharma AG, Pittsburgh, PA)]. Three months after exposure to GCCA, he developed pruritic, pigmented patches that slowly coalesced and darkened over 8 years. Although not recognized at onset, skin biopsy showed typical histology of NSF affecting the entire dermis: CD34/procollagen I spindle cells associated with fibrosis. Biopsy performed 6 years later showed superficial scar-like fibrosis that was CD34/procollagen I and had numerous elastocollagenous balls (refractile elastic fibers surrounded by coarse collagen). Biopsy 7 years later showed the superimposition of osseous metaplasia on elastocollagenous balls. Both of these later biopsies had typical NSF histology affecting the deep dermis and subcutis. Over time, there was progressive diminishment of CD34 and procollagen I+ cells and an increase in FXIIIa+ and CD68 cells. Scanning electron microscopy and energy-dispersive x-ray spectroscopy showed Gd deposits in all areas of typical NSF histology but not in the regions of scar-like fibrosis, elastocollagenous balls, or osseous metaplasia. We suspect that the later changes may represent a late, involuting stage of NSF.

Delay in diagnosis: trauma- and coinfection-related cutaneous leishmaniasis because of Leishmania guyanensis infection.

Trauma can trigger the onset of some lesions of cutaneous leishmaniasis (CL). In this study, we present the case of a 65-year-old man who developed persistent, ulcerative, nodular lymphangiitis at the site of elbow abrasions from a fall during a trip to northeastern Brazil. Skin and lymph node biopsy showed tuberculoid granulomatous inflammation and Grocott-methamine silver-positive yeast forms consistent with Sporothrix and Staphylococcus lugdunensis was identified from tissue culture. Antibacterial and antifungal treatment produced short-term healing. Crusted papules recurred at the sites of injury 3 months later and persisted despite therapy. After 15 months, two punch biopsies showed scarring and granulomatous inflammation; cultures and histochemical stains were negative for microorganisms. Because of refractory disease, multiple polymerase chain reaction (PCR) assays for infectious agents on DNA extracted from the biopsy specimens were performed, and Leishmania guyanensis was detected in all specimens. The patient refused pentavalent antimonial therapy and elected for excision of the CL lesions. After 2 years of follow up, he is without disease. CL should be considered in the differential diagnosis in patients who present with ulcerative, nodular lymphangiitis; have a history of travel to endemic regions; and describe a traumatic insult to the affected region. PCR methods for infectious agents increase the sensitivity and specificity of detecting causative agents in these patients who are negative by routine methods. In some, leishmaniasis may be an occult infection whose presence is heralded by trauma. Coinfection, by altering the immune response, may have facilitated the clinical acquisition of CL.

Localized lymphedema (elephantiasis): a case series and review of the literature.

BACKGROUND: Lymphedema typically affects a whole limb. Rarely, lymphedema can present as a circumscribed plaque or an isolated skin tumor. OBJECTIVE: To describe the clinical and pathologic characteristics and etiologic factors of localized lymphedema. METHODS: Case-control study of skin biopsy and excision specimens histologically diagnosed with lymphedema and presenting as a localized skin tumor identified during a 4-year period. RESULTS: We identified 24 cases of localized lymphedema presenting as solitary large polyps (11), solid or papillomatous plaques (7), pendulous swellings (4), or tumors mimicking sarcoma (2). Patients were 18 females and 6 males with a mean age of 41 years (range 16-74). Anogenital involvement was most frequent (75%)--mostly vulva (58%), followed by eyelid (13%), thigh (8%) and breast (4%). Causative factors included injury due to trauma, surgery or childbirth (54%), chronic inflammatory disease (rosacea, Crohn's disease) (8%), and bacterial cellulitis (12%). Eighty-five percent of these patients were either overweight (50%) or obese (35%). Compared with a series of 80 patients with diffuse lymphedema, localized lymphedema patients were significantly younger (41 vs. 62 years old, p = 0.0001), had no history of cancer treatment (0% vs. 18%, p = 0.03), and had an injury to the affected site (54% vs. 6%, p = 0.0001). Histologically, all cases exhibited dermal edema, fibroplasia, dilated lymphatic vessels, uniformly distributed stromal cells and varying degrees of papillated epidermal hyperplasia, inflammatory infiltrates and hyperkeratosis. Tumor size significantly and positively correlated with history of cellulitis, obesity, dense inflammatory infiltrates containing abundant plasma cells, and lymphoid follicles (p < 0.05). A history of cellulitis, morbid obesity, lymphoid follicles and follicular cysts predicted recurrent or progressive swelling despite excision (p < 0.05). CONCLUSIONS: Localized lymphedema should be considered in the etiology of skin tumors when assessing a polyp, plaque, swelling or mass showing dermal edema, fibrosis and dilated lymphatics on biopsy. A combination of lymph stasis promoting factors (trauma, obesity, infection and/or inflammatory disorders) produces localized elephantiasis.

Plasmacytoid squamous cell carcinoma of the vulva.

Although neoplastic cells with a plasmacytoid appearance have been reported in a variety of tumors, to the best of our knowledge, a plasmacytoid squamous cell carcinoma (SCC) of the vulva or skin has heretofore not been described. We document the case of a 92-year-old female patient with a history of multiple excisions for vulvar verrucous and SCCs, who presented with a 3-cm, symptomatic, polypoid mass of the left upper vulva. Histologically, sheets of dyscohesive relatively monotonous plasmacytoid and spindle cells were found dispersed throughout the dermis. The neoplastic cells expressed cytokeratins AE3, 5/6, and 903, p63, and the plasma cell markers CD138 (syndecan-1) and VS38. The neoplastic cells did not label with S-100 protein, Melan-A, smooth muscle actin, desmin, Kappa and Lambda light chains, epithelial membrane antigen, MOC-31, uroplakin III, thrombomodulin, and E-cadherin. Based on the tumor location, morphology, and immunohistochemical results, the diagnosis of plasmacytoid SCC of the vulva was rendered. Six months after complete excision, she developed regional inguinal lymph node and pulmonary metastases and died. Like other plasmacytoid malignancies, vulvar plasmacytoid SCC is a rare and likely aggressive variant of SCC, which can pose significant diagnostic challenges. Squamous cell carcinoma should also be considered in the differential diagnosis of neoplasms with plasmacytoid cytology. To correctly classify plasmacytoid malignancies, a wide panel of immunohistochemical markers must be used.

Neutrophilic myositis as a manifestation of celiac disease: a case report.

A 42-year-old white man presented with recurrent attacks of muscle pain and swelling. Clinically, he looked like he had severe pyogenic infection. He failed to respond to multiple courses of wide-spectrum antibiotics. Repeated cultures from muscle lesions and from the blood were negative. Hospital course was very hectic and life threatening at times. Upon further questioning, the patient gave a history of frequent loose-bowel movements for many years. A duodenal biopsy with villous blunting and positive antiglidin antibodies confirmed the diagnosis of celiac disease. The patient had complete recovery and remained in remission on a gluten-free diet.