Humans ; Neoplasms, Muscle Tissue ; congenital ; diagnosis

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

Tumor-mimicking lesions in the musculoskeletal system can be defined as lesions mistaken as tumors due to the presence of palpation upon physical examination or a tumor-like appearance upon radiological examination. Moreover, tumor-mimicking lesions show diverse etiologies and anatomic locations. We illustrated the various tumor-mimicking lesions involving bone and soft tissue. In this review, the tumor-mimicking lesions were classified into those based on clinical examination and those based on radiological examination in musculoskeletal radiology. Awareness of the various causes of tumor-mimicking lesions, correctly obtaining clinical information, and the proper selection of imaging modality are important for the differentiation of tumor-mimicking lesions from true neoplasms.
Bone Neoplasms/diagnosis ; Diagnosis, Differential ; *Diagnostic Imaging ; Humans ; Muscle Neoplasms/diagnosis ; Musculoskeletal Diseases/*diagnosis ; Physical Examination ; Soft Tissue Neoplasms/diagnosis

Adult ; Aged ; Female ; Humans ; Laryngeal Neoplasms ; diagnosis ; surgery ; Male ; Middle Aged ; Neoplasms, Muscle Tissue ; diagnosis ; surgery

Female ; Humans ; Middle Aged ; Neoplasms, Muscle Tissue ; diagnosis ; Vaginal Neoplasms ; diagnosis

Intramuscular sparganosis is not common, and its rarity makes it difficult to be distinguished from soft tissue tumors. A case of rare intramuscular sparganosis is reported. A 44-year-old man presented with a painful mass in the left thigh for 8 months, which was initially diagnosed a as soft tissue tumor. Ultrasonography and MRI revealed a multilobulated mass in the sartorius muscle. After the needle biopsy under the guidance of ultrasonography, sparganum was discovered under microscopic examination of the excised tissue. Surgical excision was performed, and a live larva of sparganum was removed. Sparganosis should be considered in the differential diagnosis of soft tissue tumors, especially among Koreans who have frequently ingested mountain water and consumed raw snakes or frogs.
Adult ; Diagnosis, Differential ; Human ; Male ; Muscle Neoplasms/*diagnosis ; Sparganosis/*diagnosis/parasitology/radiography/ultrasonography

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

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

Mammary-type myofibroblastoma of the soft tissue is a benign mesenchymal tumor, and it is a recently established clinical entity. We report a case of myofibroblastoma of the chest wall with a prominent epithelioid feature, that occurred in a 12-year old female. Although the lesion occurred in the breast area, there was no breast parenchyma in or around the mass, which favored soft tissue of the chest wall origin. The tumor was immunohistochemically identical to the mammary-type myofibroblastoma with diffuse and strong positivity against CD34 and desmin. The myoepithelial differentiation of the tumor was further supported by the electron microscopic analysis. This case indicates that mammary-type myofibroblastoma can occur in a young girl. The mammary-type myofibroblastoma should be considered a differential diagnosis, among epithelioid soft tissue neoplasms in the chest wall when the proper immunohistochemical work-up is done.
Breast ; Child ; Desmin ; Diagnosis, Differential ; Female ; Humans ; Neoplasms, Muscle Tissue* ; Soft Tissue Neoplasms ; Thoracic Wall* ; Thorax*

Adult ; Female ; Humans ; Hysterectomy ; Leiomyoma ; diagnosis ; Middle Aged ; Muscle Neoplasms ; complications ; surgery ; Uterine Neoplasms ; complications ; surgery