Solitary Testicular Myofibroma: A Case Report and Review of the Literature

Abstract Myofibromas are benign mesenchymal neoplasms of myofibroblastic origin. Most present as solitary lesions at any age, but the presentation of multiple lesions in newborns and infants is known as infantile myofibromatosis. Multicentric lesions commonly involve soft tissues and bone and may involve internal organs, where they are associated with an unfavorable prognosis. Solitary lesions involving the viscera are rare. We report a case of a 3-month-old male infant with a left testicular mass detected during an evaluation for suspected torsion. The patient underwent orchiectomy, revealing a nodular mass with grossly evident foci of necrosis. Histologically, the lesion exhibited small fascicles of plump eosinophilic, smooth muscle actin–positive spindle cells, alternating with larger areas of primitive cells with vesicular nuclei and scant cytoplasm arranged around a hemangiopericytoma-like vasculature. To our knowledge, this is the first report of a myofibroma localized within the testis.

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Temporal primary cutaneous carcinosarcoma in the ear: A case report

10.7241/ourd.20212.20 ◽

2021 ◽

Vol 12 (2) ◽

pp. 180-182

Author(s):

Issam Msakni ◽

Aya Khemir ◽

Nada Mansouri

Keyword(s):

Case Report ◽

Smooth Muscle Actin ◽

The Body ◽

Muscle Actin ◽

Epithelial Component ◽

Spindle Cells ◽

Stromal Component ◽

Peripheral Palisading ◽

Biphasic Tumor

Carcinosarcoma is a rare biphasic tumor made of two malignant components—the epithelial component and the stromal component—that can develop anywhere on the body, but mainly in sun-exposed areas. We report the case of a 78-year-old male who presented himself with a right temporal tumor in the ear 10 cm in diameter. A biopsy suggested a sarcoma. The patient underwent an extensive surgical resection of the temporal mass and the ipsilateral ear. A microscopic examination of the tumor revealed two intermixed malignant contingents. The epithelial component was made of atypical basaloid cells arranged in nests with peripheral palisading and expressing cytokeratin. The stromal component was made of atypical spindle cells expressing smooth muscle actin (SMA). A diagnosis of primary cutaneous carcinosarcoma with clear margins was reached. The patient is alive and without recurrence after twelve months of a follow-up period.

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Mammary-type Myofibroblastoma with Leiomyomatous Differentiation: A Rare Variant with Potential Pitfalls

International Journal of Surgical Pathology ◽

10.1177/10668969211031309 ◽

2021 ◽

pp. 106689692110313

Author(s):

Alexander M. Strait ◽

Julia A. Bridge ◽

Anthony J. Iafrate ◽

Marilyn M. Li ◽

Feng Xu ◽

...

Keyword(s):

Adipose Tissue ◽

Transcriptome Sequencing ◽

Smooth Muscle Actin ◽

The Body ◽

Muscle Actin ◽

Mature Adipose Tissue ◽

Spindle Cells ◽

Whole Transcriptome Sequencing ◽

Whole Transcriptome

Myofibroblastoma is a rare, benign stromal tumor with a diverse morphologic spectrum. Mammary-type myofibroblastoma (MTMF) is the extra-mammary counterpart of this neoplasm and its occurrence throughout the body has become increasingly recognized. Similar morphologic variations of MTMF have now been described which mirror those seen in the breast. We describe a case of intra-abdominal MTMF composed of short fascicles of eosinophilic spindle cells admixed with mature adipose tissue. The spindle cells stained diffusely positive for CD34, desmin, smooth muscle actin, and h-caldesmon by immunohistochemistry. Concurrent loss of RB1 (13q14) and 13q34 loci were confirmed by fluorescence in situ hybridization whereas anchored multiplex PCR and whole transcriptome sequencing did not reveal any pathognomonic fusions suggesting an alternative diagnosis. To the best of our knowledge this is the first documented case of leiomyomatous variant of MTMF.

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Benign Myoepithelioma of the Lung

Archives of Pathology & Laboratory Medicine ◽

10.5858/2001-125-1494-bmotl ◽

2001 ◽

Vol 125 (11) ◽

pp. 1494-1496

Author(s):

Ravindra Veeramachaneni ◽

Janis Gulick ◽

Ari O. Halldorsson ◽

Thanh T. Van ◽

Ping L. Zhang ◽

...

Keyword(s):

Positron Emission Tomography ◽

Smooth Muscle ◽

Smooth Muscle Actin ◽

Emission Tomography ◽

Muscle Actin ◽

Computed Tomographic ◽

Spindle Cells ◽

Positron Emission ◽

Computed Tomographic Scan ◽

Wedge Biopsy

Abstract This report describes a benign myoepithelioma of the lung that occurred in a 60-year-old woman. The patient had experienced hoarseness for 6 weeks, and a computed tomographic scan showed a nodule of approximately 2 cm in diameter at the peripheral portion of her right upper lung. Positron emission tomography showed no uptake of F-18 fluorodeoxyglucose in the nodule. Wedge biopsy of the lesion showed benign spindle cells arranged in a whorled pattern. The cells were positive for both cytokeratin and smooth muscle actin, which corresponded to the presence of tonofilaments and myofilaments that were identified ultrastructurally. The features of the present case of benign myoepithelioma that differ from features of previously reported benign and malignant cases of myoepithelioma in the lung are discussed in the report.

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Case Report: A giant myopericytoma involving the occipital region of the scalp - a rare entity

F1000Research ◽

10.12688/f1000research.10505.1 ◽

2016 ◽

Vol 5 ◽

pp. 2905 ◽

Cited By ~ 1

Author(s):

Sunil Munakomi ◽

Pramod Chaudhary

Keyword(s):

Smooth Muscle ◽

Case Report ◽

Histological Examination ◽

Rare Case ◽

Smooth Muscle Actin ◽

Positive Staining ◽

Occipital Region ◽

Rare Entity ◽

Muscle Actin ◽

Complete Excision

Herein we report a rare case of a giant myopericytoma presenting in a 16-year-old girl as a slowly progressive swelling involving the scalp in the occipital region. It was managed by complete excision. Histological examination of the lesion revealed spindle-shaped cells forming characteristic rosettes around the blood vessels, and positive staining with smooth muscle actin.

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Primary prostatic extragastrointestinal stromal tumor: a case report and literature review

Journal of International Medical Research ◽

10.1177/0300060518791677 ◽

2018 ◽

Vol 46 (10) ◽

pp. 4343-4349 ◽

Cited By ~ 3

Author(s):

Yong-hao You ◽

Yi Zhang

Keyword(s):

Literature Review ◽

Rectal Wall ◽

Smooth Muscle Actin ◽

Treatment Method ◽

Stromal Tumor ◽

Anterior Rectal Wall ◽

Muscle Actin ◽

Pelvic Tumor ◽

Extragastrointestinal Stromal Tumor ◽

Spindle Cells

Objective This study was performed to discuss the characteristics, diagnosis, and treatment of primary prostatic extragastrointestinal stromal tumor (EGIST). Methods The case history data of a patient with an EGIST were analyzed and discussed with a literature review. Results The patient was diagnosed with a pelvic tumor, possibly malignant. We ascertained the diagnosis by exploratory surgery and pathological biopsy. The tumor was present in the prostate and infiltrated and pressed against the anterior rectal wall. Pathological biopsy showed that the tumor comprised spindle cells, which were also present at the junction of the tumor and prostate tissue. Immunohistochemically, the tumor cells were positive for CD117, DOG-1, CD34, and smooth muscle actin and negative for S100 and desmin; Ki-67LI was about 10%. These results support the diagnosis of primary prostatic EGIST. Conclusion The rarity and nonspecific clinical manifestation of prostatic EGIST facilitate misdiagnosis. Diagnosis mainly depends on imaging examination and characteristic histopathological and immunohistochemical features, and GIST must be excluded. Surgery is the main treatment method, and imatinib is suggested for unresectable and malignant EGISTs.

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Primary Glomangioma of the Liver: A Case Report and Review of the Literature

Archives of Pathology & Laboratory Medicine ◽

10.5858/2004-128-e46-pgotla ◽

2004 ◽

Vol 128 (3) ◽

pp. e46-e49 ◽

Cited By ~ 2

Author(s):

Vilkesh R. Jaiswal ◽

Julie G. Champine ◽

Suash Sharma ◽

Kyle H. Molberg

Keyword(s):

Tumor Cells ◽

Smooth Muscle Actin ◽

Vascular Network ◽

Pericellular Matrix ◽

Muscle Actin ◽

Review Of The Literature ◽

Deep Soft Tissue ◽

Large Tumor ◽

Glomus Tumors

Abstract Glomangiomas are a subset of glomus tumors that have a rich vascular network. Although a majority of the glomus tumors occur in the skin of the hand, they have also been reported in the deep soft tissue, bone, lungs, and gastrointestinal tract, especially the stomach. To our knowledge, only one such case has previously been reported primarily occurring in the liver. We report a case of a glomangioma primarily arising in the liver of a 57-year-old man who presented with right flank pain of several months' duration. A 3.0-cm hepatic mass was excised and consisted of numerous, small-to-medium branched vessels with the stroma containing small, round, regular cells with sharply outlined round-to-oval nuclei. Immunostains showed the tumor cells to be diffusely positive for vimentin and smooth muscle actin and to be focally positive for calponin. Collagen IV stained the pericellular matrix. The immunostain for CD34 highlighted the vascular network as well as outlined the tumor cells in many areas. Coexpression of actin and CD34 in glomus tumors, although unusual, has recently been reported in the literature. Despite its bland histology, the large tumor size and deep visceral location were suggestive of aggressive behavior; thus, a close clinical follow-up was recommended. The patient had an unremarkable postoperative course and has no evidence of metastatic disease 12 months after the procedure. An accurate diagnosis and an understanding the biology of this rare disease, especially in an unusual location, are crucial to its management.

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Solitary Fibrous Tumor of the Larynx: A Case Report and Review of the Literature

Archives of Pathology & Laboratory Medicine ◽

10.5858/2006-130-213-sftotl ◽

2006 ◽

Vol 130 (2) ◽

pp. 213-216 ◽

Cited By ~ 5

Author(s):

Jorge E. Dotto ◽

William Ahrens ◽

David J. Lesnik ◽

Diane Kowalski ◽

Clarence Sasaki ◽

...

Keyword(s):

Case Report ◽

Solitary Fibrous Tumor ◽

Review Of The Literature ◽

Solitary Fibrous Tumors ◽

Subsequent Investigation ◽

Mesenchymal Neoplasms ◽

Fibrous Tumor

Abstract Solitary fibrous tumors are relatively rare mesenchymal neoplasms that were originally described as pleural- or peritoneal-based lesions. Although they were considered a form of mesothelioma, subsequent investigation failed to reveal mesothelial differentiation. Characterization of their histologic and immunohistochemical features, as well as identification in a multitude of nonmesothelial-based locations has further served to distinguish these lesions from the more diffuse and aggressive mesothelioma. Reports of solitary fibrous tumor in the larynx are extremely rare. We report a case of solitary fibrous tumor of the larynx in a 38-year-old man.

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Inflammatory myofibroblastic tumor of the pancreas in a dog

Journal of Veterinary Diagnostic Investigation ◽

10.1177/1040638719879737 ◽

2019 ◽

Vol 31 (6) ◽

pp. 879-882

Author(s):

Mariarita Romanucci ◽

Sabrina V. P. Defourny ◽

Marcella Massimini ◽

Laura Bongiovanni ◽

Giovanni Aste ◽

...

Keyword(s):

Inflammatory Myofibroblastic Tumor ◽

Distress Syndrome ◽

Plasma Cells ◽

Smooth Muscle Actin ◽

S100 Protein ◽

Variable Number ◽

Postmortem Examination ◽

Muscle Actin ◽

Coagulative Necrosis ◽

Spindle Cells

A large, ill-defined, firm, multinodular mass involving the pancreas was confirmed on postmortem examination of a 5-y-old, male Rottweiler that died following acute respiratory distress syndrome, after a period of anorexia and lethargy. Histologically, the mass consisted of plump spindle cells admixed with a variable number of macrophages, lymphocytes, plasma cells, and neutrophils. Foci of coagulative necrosis and hemorrhage were also observed. Spindle cells strongly reacted to antibodies against vimentin, α–smooth muscle actin, and calponin, whereas desmin was expressed only mildly and focally. Pan-cytokeratin, KIT, glial fibrillary acidic protein, and S100 protein were nonreactive. Variable numbers of MAC 387–positive cells, CD3+ lymphocytes, and numerous blood vessels were also detected throughout the mass. Histologic and IHC findings were consistent with a diagnosis of inflammatory myofibroblastic tumor of the pancreas.

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