Buttocks ; pathology ; Humans ; Muscle Neoplasms ; diagnosis ; Muscle, Skeletal ; pathology ; Synovitis, Pigmented Villonodular ; diagnosis

Child, Preschool ; Diagnosis, Differential ; Female ; Humans ; Inflammation ; pathology ; Neoplasms, Muscle Tissue ; diagnosis ; pathology ; surgery ; Prognosis

Diagnosis, Differential ; Female ; Humans ; Lymph Nodes ; pathology ; Middle Aged ; Neoplasms, Muscle Tissue ; diagnosis ; pathology

Objective: To investigate the clinicopathologic and molecular genetic characteristics, diagnosis, differential diagnosis, treatment and prognosis of histiocyte-rich rhabdomyoblastic tumor (HRRMT). Methods: The clinical data of two cases of HRRMT diagnosed in Fujian Provincial Hospital and Fujian University of Traditional Chinese Medicine Affiliated People's Hospital from 2020 to 2021 were collected. Histopathology and immunohistochemical (IHC) staining were used to assess morphological changes; the genetic changes were analyzed with next-generation sequencing. The relevant literature was reviewed. Results: Both cases showed well-defined solid nodules and soft masses. Microscopically, the tumors had a fibrous pseudocapsule with lymphocytic aggregation, and locally invaded the surrounding skeletal muscle tissue, and the tumor cells were fusiform to epithelioid with an intensive foamy histiocytic infiltrate. No necrosis or mitosis was observed. Immunophenotyping showed the tumor cells were positive for desmin, either one or both skeletal muscle markers (myogenin or MyoD1), and negative for h-caldesmon, ALK and SMA. The Ki-67 index was<5%. Using next-generation sequencing, one case was found to harbour KRAS (G12D) and MSH3 (Q470^*) mutations. Conclusions: HRRMT is a newly described skeletal muscle tumor with uncertain malignant potential. Its diagnosis and differential diagnosis depend on morphologic and IHC staining. No specific molecular genetics changes have been identified so far.
Biomarkers, Tumor/analysis* ; Diagnosis, Differential ; Histiocytes/pathology* ; Humans ; Molecular Biology ; Muscle Neoplasms/pathology* ; Prognosis

Malignant mesothelioma (MM) is a relatively rare carcinoma of the mesothelial cells, and it is usually located in the pleural or peritoneal cavity. Here we report on a unique case of MM that developed in the chest, abdominal and pelvic walls in a 77-year-old female patient. CT and MRI revealed mesothelioma that manifested as a giant mass in the right flank and bilateral pelvic walls. The diagnosis was confirmed by the pathology and immunohistochemistry. Though rare, accurate investigation of the radiological features of a body wall MM may help make an exact diagnosis.
Abdominal Neoplasms/diagnosis/*pathology ; Abdominal Wall ; Aged ; Female ; Humans ; Magnetic Resonance Imaging ; Mesothelioma/diagnosis/*pathology ; Muscle Neoplasms/diagnosis/pathology ; Pelvic Neoplasms/diagnosis/*pathology ; Thoracic Neoplasms/diagnosis/*pathology ; Tomography, X-Ray Computed

INTRODUCTIONThe clinical management of Smooth Muscle Tumours of Uncertain Malignant Potential (STUMPs) remains controversial because little is known about the natural history of these tumours and pathological classifications do not correlate well with clinical outcomes and therefore cannot direct management. The objective of this study was to review a single institution's experience with STUMP and recommend a rational clinical approach to the management of patients with this histological diagnosis.

MATERIALS AND METHODSA systematic review of all diagnoses of STUMP and leiomyosarcoma from the gynaecologic oncology and pathology databases between January 1970 and February 2006.

RESULTSA total of 18 diagnoses of STUMP and 72 diagnoses of Ieiomyosarcoma were made during the study period. None of these 72 cases of leiomyosarcoma had a prior diagnosis of STUMP. There were no recurrences in the 18 cases of STUMP with all 18 cases being registered as disease-free after 5 years.

CONCLUSIONSWe recommend that patients with a diagnosis of STUMP be expectantly managed given the low likelihood of leiomyosarcomatous transformation, the lack of any evidence that adjuvant treatments result in better long-term outcomes and that recurrences are amenable to surgical resection with good outcomes.

Adult ; Female ; Humans ; Leiomyoma ; diagnosis ; pathology ; surgery ; Retrospective Studies ; Smooth Muscle Tumor ; diagnosis ; pathology ; surgery ; Uterine Neoplasms ; diagnosis ; pathology ; surgery ; Uterus ; pathology ; surgery

Primary leiomyosarcoma of the nipple-areola complex is extremely rare. Less than ten such cases have been reported in English literature so far. Herein we describe a 52-year-old female presenting with a 1.5 cmx1.1 cmx0.7 cm nodular lesion over her left nipple, and leiomyosarcoma was proved by pathological examination of the excised specimen. Positron emitted tomogram (PET) revealed no abnormal signal other than the primary site. Microscopically, this poorly circumscribed tumor was composed of interlacing bundles of smooth muscle cells with bizarre and pleomorphic nuclei, as well as prominent nucleoli. Its mitotic count was up to 7 mitoses per 10 high power fields (HPF). Immunohistochemical study of tumor cells revealed positive stain for alpha-smooth muscle actin and vimentin; and negative for cytokeratin, CD34 and S-100. Left simple mastectomy was undertaken and no residual mass lesion was noted on the resected specimen. Related literatures about the diagnosis and treatment for breast leiomyosarcoma will be presented here.
Antigens, CD34 ; biosynthesis ; Breast ; pathology ; Breast Neoplasms ; diagnosis ; pathology ; Cell Nucleus ; metabolism ; Female ; Humans ; Immunohistochemistry ; methods ; Leiomyosarcoma ; diagnosis ; pathology ; Mastectomy ; Middle Aged ; Myocytes, Smooth Muscle ; pathology ; Nipples ; pathology ; S100 Proteins ; biosynthesis ; Smooth Muscle Tumor ; diagnosis ; pathology ; Treatment Outcome

PURPOSE: To present a case of inflammatory myofibroblastic tumor which was manifested as an idiopathic subretinal mass without underlying pathology. METHODS: The subretinal mass was surgically excised and evaluated histopathologically. Fluorescein angiography and optical coherence tomography were performed pre- and post-operatively. RESULTS: The mass was histologically composed of lymphoplasma cell infiltration and fibrous proliferation without microorganisms or malignant cells. Immunohistochemistry for smooth muscle actin revealed myofibroblasts as a major cellular component. Preoperative optical coherent tomography showed that the lesion was contiguous to the retina while inducing foveal detachment. Postoperatively, the fovea was attached with visual recovery, and the subretinal lesion did not recur during the follow up. CONCLUSIONS: Inflammatory myofibroblastic tumors may be included in the differential diagnoses of subretinal masses.
Tomography, Optical Coherence ; Retina/pathology ; Neoplasms, Muscle Tissue/diagnosis/*pathology ; Male ; Inflammation/pathology ; Humans ; Fundus Oculi ; Fluorescence ; Eye Neoplasms/*pathology ; Choroid/pathology ; Atrophy ; Angiography ; Adult

Biopsy ; Humans ; Male ; Middle Aged ; Muscle Neoplasms ; diagnosis ; pathology ; Neoplasm Metastasis ; Nerve Sheath Neoplasms ; diagnosis ; pathology ; Recurrence ; Sciatic Nerve ; pathology ; Tomography, X-Ray Computed

Myolipoma is a rare benign tumor, composed of irregularly admixed adipose tissue and smooth muscle fibers. Few literature studies have described the radiologic appearance of myolipoma, especially in the soft tissue. No MRI findings in subcutaneous myolipoma of an extremity have been reported. Here, we report on the case of a 34-year-old woman with myolipoma in the subcutaneous tissue of the ankle and describe MRI features of the lesion.
Adult ; *Ankle ; Female ; Humans ; Lipoma/*diagnosis/pathology ; *Magnetic Resonance Imaging ; Muscle, Smooth/pathology ; Soft Tissue Neoplasms/*diagnosis/pathology ; Subcutaneous Fat/pathology