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This is a benign tumor of soft tissue. Most leiomyomas occur in the uterus, so-called fibroids. However, leiomyomas have occurred in nearly every organ and every location in the soft tissue. Under the microscope, they are nearly identical in every site. Clinically, it is one of the soft tissue tumors that present with pain.


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The Morphologic Spectrum of Kidney Tumors in Hereditary Leiomyomatosis and Renal Cell Carcinoma (HLRCC) Syndrome.

*Laboratory of Pathology †Urologic Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD.


Am J Surg Pathol. 2007 Oct;31(10):1578-1585. Abstract quote

Hereditary leiomyomatosis and renal cell carcinoma (HLRCC) is an autosomal dominant familial syndrome characterized by the development of cutaneous and uterine leiomyomas as well as renal tumors. The mutation of this condition has been identified in the fumarate hydratase (FH, 1q42.3-q43) gene. The histology of the renal cancers has not been well described or illustrated because of the newness of the syndrome.

We reviewed 40 renal tumors resected from 38 patients belonging to HLRCC families with proven fumarate hydratase germline mutation. Patients ranged in age from 17 to 75 years of age. Tumors were unilateral in all but 2 cases. The size of the tumors varied between 2.3 and 20 cm and there was no laterality preference. Several different architectural patterns were recognized: papillary (25 cases), tubulo-papillary (8 cases), tubular (2 cases), and solid (1 case). Mixed patterns were also present in 4 cases.

The most important histologic feature of these neoplasms, which we believe to be the hallmark of the HLRCC tumors, is the presence of a characteristic large nucleus with a very prominent inclusion like orangiophilic or eosinophilic nucleolus, surrounded by a clear halo. Immunohistochemical studies did not provide a specific marker for these tumors, however, loss of heterozygosity at 1q32 and 1q42-44 was frequently found. These tumors are associated with poor prognosis and frequent spread to regional lymph nodes.

At the moment, morphology is the best tool to recognize these tumors. Proper diagnosis of this syndrome by the pathologist may assist in early detection of these tumors.


Do Leiomyomas of Deep Soft Tissue Exist? An Analysis of Highly Differentiated Smooth Muscle Tumors of Deep Soft Tissue Supporting Two Distinct Subtypes

Steven D. Billings, M.D.; Andrew L. Folpe, M.D.; Sharon W. Weiss, M.D.

From the Department of Pathology and Laboratory Medicine, Emory University, Atlanta, Georgia, U.S.A.

Am J Surg Pathol 2001;25:1134-1142 Abstract quote

There is a prevailing view that leiomyomas of deep soft tissue are rare or nonexistent, but there are limited data on this subject in the form of large clinical studies with long follow-up information.

We reviewed 36 consultation cases that had been diagnosed as leiomyoma or probable leiomyoma based on absence of nuclear atypia, necrosis, and no/minimal mitotic activity. Follow-up information was obtained to determine whether these stringent histologic criteria could identify a biologically benign group of smooth muscle tumors of deep soft tissue.

The tumors occurred in two distinct locations. The first (n = 13) occurred in deep somatic soft tissue of the lower extremity (7), upper extremity (2), trunk (2), axilla (1), and back (1) and affected the sexes equally (7 male, 6 female). Composed of a circumscribed mass of mature smooth muscle cells, they were frequently calcified with a mean mitotic activity of <1 mitosis/50 high power fields (HPF) (range 1–4 mitoses/50 HPF). Estrogen receptor and progesterone receptor proteins were negative in the three cases tested. No tumors recurred or metastasized (mean follow-up 58.7 months, range 5–97 months). The second group (n = 23) occurred within the retroperitoneum (20) or abdominal cavity (3) of women (1 male, 22 female). Resembling uterine leiomyomas, they were always distinct from the uterus, occasionally multiple (n = 4), and sometimes occurred up to years after hysterectomy (n = 3). Four cases occurred with synchronous uterine leiomyomas. In the six cases tested, five of six were positive for the estrogen receptor protein and all were positive for progesterone receptor protein. Mean mitotic activity was 1 mitosis/50 HPF (range <1–10 mitoses/50 HPF). None developed metastasis within the follow-up period (mean 42.5 months, range 6–120 months); one tumor with a positive margin recurred at 10 months.

We conclude that clinically benign smooth muscle tumors of deep soft tissue are rare but can be identified using stringent histologic criteria. They comprise two distinct subtypes: leiomyomas of somatic soft tissue and retroperitoneal–abdominal leiomyomas. The latter probably arise from hormonally sensitive smooth muscle. Although similar to uterine leiomyomas, they are located at sites removed from the uterus and are likely independent soft tissue primaries rather than parasitic leiomyomas of the uterus. We suggest that these two groups of smooth muscle tumors be diagnostically approached in a site-specific fashion.

Germline fumarate hydratase mutations and evidence for a founder mutation underlying multiple cutaneous and uterine leiomyomata.

Chuang GS, Martinez-Mir A, Geyer A, Engler DE, Glaser B, Cserhalmi-Friedman PB, Gordon D, Horev L, Lukash B, Herman E, Cid MP, Brenner S, Landau M, Sprecher E, Garcia Muret MP, Christiano AM, Zlotogorski A.

Department of Dermatology, Columbia University, New York, New York, USA.

J Am Acad Dermatol. 2005 Mar;52(3 Pt 1):410-6. Abstract quote  

Multiple cutaneous and uterine leiomyomata syndrome (MCL) is an autosomal dominant disease characterized by the presence of concurrent benign tumors of smooth muscle origin (leiomyoma) in the skin and uterus of affected females, and in the skin of affected males. MCL can also be associated with type II papillary renal cell cancer (HLRCC). The genetic locus for MCL and HLRCC was recently mapped to chromosome 1q42.3-43 and subsequently, dominantly inherited mutations in the fumarate hydratase gene ( FH ) were identified. Importantly, analysis of the FH gene in tumors of MCL patients revealed a second mutation inactivating the wild-type allele in some tumors.

Based on these findings, it has been suggested that FH may function as a tumor suppressor gene in MCL. Here, we report the analysis of the FH gene in a group of 11 MCL families, with the identification of 8 different mutations accounting for the disease in all families. One of the mutations, 905-1G>A, has been identified in 4 families of Iranian origin. The analysis of highly polymorphic markers in the vicinity of the FH gene showed a shared haplotype in these 4 families, suggesting that 905-1G>A represents a founder mutation.

Collectively, identification of 5 novel and 3 recurrent mutations further supports the role of FH in the pathogenesis of MCL.


Penile Myointimoma in Children and Adolescents: A Clinicopathologic Study of 5 Cases Supporting a Distinct Entity.

*Department of Pathology, University of Arkansas for Medical Sciences ∥Arkansas Childrenʼs Hospital §Department of Urology, Arkansas Childrenʼs Hospital and University of Arkansas for Medical Sciences, Little Rock, AR †Cincinnati Childrenʼs Hospital Medical Center, Cincinnati, OH ‡Boston Childrenʼs Hospital, Harvard Medical School, Boston, MA.

Am J Surg Pathol. 2007 Oct;31(10):1622-1626. Abstract quote

Penile myointimoma is a rare benign myointimal proliferation occurring exclusively within the corpus spongiosum of the glans penis and is most commonly described in adult patients. To date, there is only one reported series of 10 penile myointimomas plus one case report, representing a total of 8 adults and 3 children/adolescents.

We report 5 penile myointimomas occurring in 5 patients less than 18 years of age (age range 4 to 15 y). All patients presented with a mass lesion on the glans penis ranging in size from 0.4 to 1.8 cm. All 5 lesions had the classic morphologic appearance: myointimal proliferation of the preexisting vascular spaces of the corpus spongiosum, creating a multinodular/plexiform architecture.

Immunohistochemically, all stained cases showed strong cytoplasmic immunoreactivity for smooth muscle actin in the lesional cells and a collarette of native smooth muscle highlighted by desmin. None of the lesions appeared completely excised, but all 5 patients were clinically free of disease at last clinical follow-up (2 to 45 mo).

In summary, we report only the second series of this distinctive, relatively rare myointimal proliferation within the corpus spongiosum of the glans penis, expand the number of published cases occurring in the pediatric/adolescent population, and confirm the benign clinical course after a marginal or incomplete excision.

A Distinctive Myointimal Proliferation (`Myointimoma') Involving the Corpus Spongiosum of the Glans Penis A Clinicopathologic and Immunohistochemical Analysis of 10 Cases

John F. Fetsch, M.D.; Robert W. Brinsko, M.D.; Charles J. Davis Jr., M.D.; F. Kash Mostofi, M.D.; Isabell A. Sesterhenn, M.D.

From the Departments of Soft Tissue Pathology and Genitourinary Pathology, Armed Forces Institute of Pathology, Washington, DC 20306-6000, U.S.A.

Am J Surg Pathol 2000;24:1524-1530 Abstract quote

This study details the clinicopathologic and immunohistochemical features associated with 10 cases of a distinctive myointimal proliferation involving the corpus spongiosum of the glans penis.

Patients ranged in age from 2 to 61 years old (mean age, 29 yrs) and presented with a mass that varied in size from 0.5 to 1.9 cm in greatest dimension. The process was said to be present from 4 days to more than 6 months before surgical intervention. In each case, microscopic examination revealed almost identical histology. There was a prominent, often occlusive, fibrointimal proliferation with plexiform architecture involving the vasculature of the corpus spongiosum. The proliferation consisted of stellate-shaped and spindled cells embedded in abundant fibromyxoid matrix. Occasional lesional cells had well-developed myoid characteristics with moderately abundant eosinophilic cytoplasm, blunt-ended nuclei, and juxtanuclear vacuoles. Foci with degenerative changes, including ``ghost cell'' morphology, were also present. The myointimal process was extensively immunoreactive for -smooth muscle actin, muscle-specific actin (HHF-35), and calponin, but it was minimally reactive for the D33 and D-ER-11 desmin clones. In contrast, native vascular smooth muscle encompassing the proliferation was strongly immunoreactive for all five markers. The myointimal cells were nonreactive for CD34, S-100 protein, and keratin. Factor VIIIrAg, CD31, and CD34 highlighted intact endothelial cells lining suboccluded vessels, scattered capillaries that penetrated the proliferation, and the normal uninvolved vasculature. The examined specimens were punch, incisional, or excisional biopsies, and in each instance, the process microscopically extended to the tissue margin. Followup data are available for 8 cases (median follow-up interval, 5 yrs 8 mos): one incompletely excised lesion with 6 months follow-up is stable but persistent, one lesion with 10 years follow-up regressed spontaneously after a punch biopsy, and the remaining six lesions have not recurred.

A differential diagnosis of myofibroma, late-stage intravascular (nodular) fasciitis, vascular leiomyoma, and plexiform fibrohistiocytic tumor is discussed.

Retroperitoneal Leiomyomas A Clinicopathologic and Immunohistochemical Study of 56 Cases With a Comparison to Retroperitoneal Leiomyosarcomas

Edina Paal, M.D. ; Markku Miettinen, M.D. , Ph.D.

From the Department of Soft Tissue Pathology, Armed Forces Institute of Pathology, Washington, DC, U.S.A.

Am J Surg Pathol 2001;25:1355-1363 Abstract quote

Most retroperitoneal smooth muscle tumors are believed to be malignant, and leiomyomas are considered very rare.

This study was undertaken to determine the clinicopathologic features and long-term follow-up of 56 tumors diagnosed as retroperitoneal leiomyomas (LM) or smooth muscle tumors with an uncertain malignant potential (SMTUMP) in an effort to correlate their behavior and clinicopathologic features.

These tumors were compared with a series of 11 cases of retroperitoneal leiomyosarcomas (excluding gastrointestinal stromal tumors). Histologic slides and immunohistochemistry for SMA, desmin, S-100 protein, HMB45, CD34, C-KIT, estrogen (ER) and progesterone (PR) receptor proteins, and MIB-1 were analyzed. All tumors diagnosed as LM and all but one SMTUMP were well-differentiated smooth muscle tumors that lacked atypia and coagulative necrosis. There was <1 mitosis per 50 high power field (HPF) in 38 tumors; no tumor had >3 mitoses/50 HPF. Most tumors had a striking resemblance to uterine smooth muscle tumors with common hyaline change and trabecular patterns.

There were 51 females and 5 males ranging in age from 25 to 79 years (mean 45 years, median 43 years). These tumors were typically large, with a mean size of 16.2 cm and weight of 1600 g. Immunohistochemically, all 35 tumors studied were positive for -SMA, 30 of 35 tumors were positive for desmin, and all were negative for CD117, S100 protein, and HMB45 and all but one for CD34. Steroid receptors were commonly present: ER in 20 of 29 cases and PR in 26 of 31 cases in the tumors of female patients. MIB-1 score was <2% in all of 28 cases.

Long-term follow-up (mean 140 months) did not reveal metastases, but two patients had local recurrence; however, neither patient with recurrence demonstrated disease progression in follow-up. By contrast, all 11 leiomyosarcomas had at least mild atypia, and all were ER and PR negative. All cases had MIB-1-positive nuclei, but only four had >10% nuclei positive. Four patients died of disease, four were alive with recurrence, and three had no evidence of disease.

A group of benign leiomyomas can be identified among retroperitoneal smooth muscle tumors. Most of these tumors resemble uterine leiomyomas by histology and positive hormone receptors, and they seem to have a good long-term prognosis with a small potential for local recurrence.



Criteria for malignancy in nonvisceral smooth muscle tumors.

Hornick JL, Fletcher CD.

Department of Pathology, Brigham and Women's Hospital, Boston; and Harvard Medical School, Boston, MA.

Ann Diagn Pathol 2003 Feb;7(1):60-6 Abstract quote

Reliable prediction of the behavior of smooth muscle tumors is notoriously problematic at many anatomic locations. Relatively few studies have addressed the minimal histologic criteria for malignancy in smooth muscle tumors of soft tissue and the presently available criteria are not only inconsistently applied but also vary at different anatomic sites.

It has been widely believed that the presence of any mitotic activity in a deep-seated smooth muscle tumor should lead to a diagnosis of leiomyosarcoma. Until very recently, the existence of leiomyomas in deep soft tissue has been disputed. Using presently available data, this review examines criteria for malignancy in smooth muscle tumors in each of the following anatomic compartments: deep soft tissue, including retroperitoneum/abdominal cavity; skin; subcutis; and external genitalia.

Distinct criteria for assessing malignancy should be applied to smooth muscle tumors at each of these locations.


Derived from the smooth muscle of subcutaneous vessels

Four types:


Intravascular angioleiomyoma J Cutan Pathol 1999;26:165
Intravenous leiomyomatosis  

Intravenous leiomyomatosis: molecular and cytogenetic analysis of a case.

Quade BJ, Dal Cin P, Neskey DM, Weremowicz S, Morton CC.

Departments of Pathology (BJQ, PDC, SW, CCM) and Obstetrics, Gynecology, and Reproductive Biology (DMN, CCM), Brigham and Women's Hospital and Harvard Medical School (BJQ, PDC, SW, CCM), Boston, Massachusetts.

Mod Pathol 2002 Mar;15(3):351-6 Abstract quote

Apart from its hormone responsiveness, little about the pathobiology of intravenous leiomyomatosis (IVL), a rare smooth muscle proliferation, is known.

We investigated the cytogenetics and molecular biology of IVL in a 40-year-old female who presented with an abrupt onset of dyspnea. In addition to the intracaval tumor mass composed of histologically benign smooth muscle, four distinct retroperitoneal "fibroids" were cytogenetically investigated. An identical abnormal karyotype, 45,XX,der(14)t(12; 14)(q15;q24),-22, was observed in all five specimens. Fluorescence in situ hybridization revealed three copies of HMGIC (alias HMGA2), two on the normal chromosomes 12 at 12q15, as well as another on the der(14) in the breakpoint region, suggesting that the 12q breakpoint occurred 5' (centromeric) to HMGIC (HMGA2), as has been frequently observed in uterine leiomyoma. Such similarity in chromosomal rearrangements suggests that there may be a pathogenetic relationship between IVL and uterine leiomyomata with t(12;14). Skewed X inactivation was observed in each tumor sample, but not in the myometrium. In each tumor, the lower molecular weight allele of HUMARA was nonrandomly inactivated.

This pattern of X inactivation is most consistent with origin from a single transformation event, and in this regard, IVL more closely resembles disseminated peritoneal leiomyomatosis than typical uterine leiomyomata.

Ossified soft tissue leiomyoma in a patient with sickle cell anemia.

Xu Y, Lacouture M, Petronic-Rosic V, Soltani K, Shea CR.

Section of Dermatology, Department of Medicine, University of Chicago Hospitals, Chicago, IL, USA.

J Cutan Pathol. 2005 Nov;32(10):696-9. Abstract quote  

Osseous metaplasia in leiomyomas is extremely rare. Here, we report the case of an ossified subcutaneous leiomyoma in a 34-year-old African American man with sickle cell thalassemia who presented with a painful nodule of the scapular region, which appeared as a heavily mineralized soft tissue mass on chest radiographs.

Histopathologic and immunohistochemical examination of the resected nodule revealed a benign soft tissue leiomyoma composed of intersecting fascicles of spindle cells that strongly expressed smooth muscle actin and caldesmon. Extensive intratumoral calcification and ossification were noticed.

Only eight cases of ossified leiomyoma have been reported, of which two arose in the deep soft tissue. Those cases are briefly reviewed and discussed.

J Cutan Pathol 2000;27:526-528

May show prominent Verocay-like body formation


Atypical Pilar Leiomyoma Cutaneous Counterpart of Uterine Symplastic Leiomyoma?

Meera Mahalingam, M.D., Ph.D.; Lynne J. Goldberg, M.D.

From the Dermatopathology Section, Department of Dermatology, Boston University School of Medicine Boston, Massachusetts.

Am J Dermatopathol 2001;23:299-303 Abstract quote

Four cases of cutaneous leiomyoma with cytologic atypia are reported. All four cases were adult men ranging in age from 33 to 92 years of age. Clinical diagnoses were diverse and included epidermal inclusion cyst, scar, nevus, dermatofibroma, squamous cell carcinoma, and basal cell carcinoma.

Histological examination of all four lesions revealed a relatively circumscribed, mild to focally moderately cellular, dermal proliferation of large, irregularly shaped spindle cells in a fascicular arrangement. Some cells contained large irregular nuclei and abundant cytoplasm; others were multinucleate. Moderate to focal marked pleomorphism and rare mitotic figures were present, raising the possibility of leiomyosarcoma; however, the sparse mitotic activity and low cellularity did not warrant this diagnosis.

This study suggests that cutaneous leiomyomas may exhibit bizarre or ``symplastic'' patterns analogous to their uterine counterparts.

A case of cutaneous symplastic leiomyoma - a rare variant of cutaneous pilar leiomyoma.

Department of Dermatology, Leeds General Infirmary, Leeds, UK.

J Cutan Pathol. 2008 Mar;35(3):329-31. Abstract quote

We describe the case of a cutaneous symplastic leiomyoma in a 37-year-old woman who presented with a 4-year history of a painful slow growing lesion on the left upper arm. The lesion was excised and subjected to histological examination.

A poorly circumscribed lesion was seen in the dermis composed of spindle shaped cells with marked nuclear pleomorphism. No mitotic figures or necrosis were seen. The cells stained strongly positive with desmin and smooth muscle actin, and negative with S100, melan A, MNF116 a mouse monoclonal antibody to cytokeratin and CK5/6. The diagnosis was felt to be in keeping with a cutaneous symplastic leiomyoma, a rarely reported variant of the pilar leiomyoma.

Histologically, it shows features similar to the symplastic variant of uterine leiomyoma with cytological atypia, nuclear pleomorphism and minimal mitotic activity. Although the long-term outlook is probably benign, the presence of cytological atypia and mitoses in any spindle cell tumor is generally a concerning feature and warrants long-term follow up.
Tranexamic Acid-associated Necrosis and Intralesional Thrombosis of Uterine Leiomyomas: A Clinicopathologic Study of 147 Cases Emphasizing the Importance of Drug-induced Necrosis and Early Infarcts in Leiomyomas.

Departments of *Pathology †Obstetrics and Gynaecology ‡Medicine, The University of Hong Kong, Queen Mary Hospital, Pokfulam Road, Hong Kong.


Am J Surg Pathol. 2007 Aug;31(8):1215-1224. Abstract quote

INTRODUCTION: Women with menorrhagia have increased levels of plasminogen activators in the endometrium. Tranexamic acid (cyklokapron), an antifibrinolytic agent, is commonly prescribed worldwide to women with menorrhagia, including those with fibroids. Necrosis in uterine leiomyomas may be associated with pregnancy, and progestogen or oral contraceptive use but its association with tranexamic acid has not been investigated. Four hundred ninety patients with uterine leiomyomas in 2004 and 2005 were reviewed. Their ages ranged from 22 to 86 (mean 47.2). One hundred forty-seven (30%) were treated with tranexamic acid.

RESULTS: Infarct-type necrosis was observed in the leiomyomas of 38 patients, 22 of whom had tranexamic acid (15%) whereas the remaining 16 had no drug exposure (4.7%) (odds ratio=3.60; 95% confidence interval: 1.83-6.07; P=0.0003). Two patients who took the drug less than 2 weeks before surgery had early infarcts with appearance resembled coagulative type necrosis. Eleven of the 22 cases of drug-induced necrotic leiomyoma (50%) also showed intralesional thrombus formation, and 4 showed organization of the thrombi.

CONCLUSIONS: Infarct-type necrosis and thrombosis of leiomyoma was more commonly observed in patients treated with tranexamic acid. Although the drug is effective for menorrhagia, clinicians should be aware of the possible complications associated with leiomyoma necrosis such as pain and fever. Distinguishing between types of necrosis may not always be straightforward particularly in early infarcts when the reparative connective tissue reaction between the viable and necrotic cells is not well-developed, resulting in an appearance similar to coagulative necrosis. When the overall gross and microscopic features of a leiomyoma with coagulative necrosis favor a benign lesion, the drug history should be reviewed so that this type of early and healing infarct-type necrosis is considered as the underlying cause of the apparent coagulative necrosis. This may otherwise result in a diagnosis of smooth muscle tumor of uncertain malignant potential, leading to prolonged follow-up and unnecessary further surgical intervention.



h-Caldesmon as a specific marker of smooth muscle cell differentiation in some soft tissue tumors of the skin.

D'Addario SF, Morgan M, Talley L, Smoller BR.

Department of Pathology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; USA Department of Dermatology, University of Arkansas for Medical Sciences, Little Rock, Arkansas; USA Department of Pathology, University of South Florida, Tampa, FL, USA.

J Cutan Pathol 2002 Aug;29(7):426-429 Abstract quote

BACKGROUND: An existing problem in contemporary pathology is the classification and distinction of spindle cell soft tissue tumors of the skin. Markers such as alpha-smooth muscle actin (alpha-SMA) and desmin, considered specific for smooth muscle cell (SMC), have been shown to be expressed in a variety of fibroblastic and myofibroblastic processes. High-molecular-weight caldesmon (h-caldesmon), one of two isoforms, is reported to be expressed exclusively by SMC and has recently been shown to be a specific marker of SMC tumors.

METHODS: Tumors were obtained from 11 patients taken from the surgical pathology archives of the University of South Florida and cases were coded as smooth muscle hamartoma, myofibroma, and dermatomyofibroma.

RESULTS: The case of smooth muscle hamartoma had greater than 90% of tumor cells labeling with anti-h-caldesmon antibodies. Three of three cases of myofibroma had focal areas of positivity representing less than 10% of total tumor cells. Seven of seven dermatomyofibromas showed no apparent labeling with anti-h-caldesmon antibody. Dense reactivity was noted in vascular wall smooth muscle, indicating internal controls.

CONCLUSIONS: We can conclude that h-caldesmon is a specific marker of fully differentiated smooth muscle and that it can serve to differentiate spindled SMC soft tissue tumors of the skin from tumors of myofibroblastic and/or fibroblastic origin.


Treatment Excision

Macpherson and Pincus. Clinical Diagnosis and Management by Laboratory Methods. Twentyfirst Edition. WB Saunders. 2006.
Rosai J. Ackerman's Surgical Pathology. Ninth Edition. Mosby 2004.
Sternberg S. Diagnostic Surgical Pathology. Fourth Edition. Lipincott Williams and Wilkins 2004.
Robbins Pathologic Basis of Disease. Seventh Edition. WB Saunders 2005.
DeMay RM. The Art and Science of Cytopathology. Volume 1 and 2. ASCP Press. 1996.
Weedon D. Weedon's Skin Pathology Second Edition. Churchill Livingstone. 2002
Fitzpatrick's Dermatology in General Medicine. 6th Edition. McGraw-Hill. 2003.
Weiss SW and Goldblum JR. Enzinger and Weiss's Soft Tissue Tumors. Fifth Edition. Mosby Elesevier 2008

Commonly Used Terms

Smooth muscle actin-These are specific for smooth muscle. Antibodies directed against these intermediate filaments can be used to confirm the identity of this tumor.

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