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 ; Diagnostic Errors ; Humans ; Male ; Maxillary Sinus Neoplasms ; diagnosis ; Neoplasms, Muscle Tissue ; diagnosis

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

OBJECTIVETo summarize the clinical features of extraorbital inflammatory myofibroblastic tumor (IMT) of the head and neck.

METHODSFourteen cases of extraorbital IMT treated in recent 20 years were analyzed retrospectively.

RESULTSOf the 14 patients, 9 cases with limited lesion in maxilla (n = 5), mandible (n = 2) or neck (n = 2) underwent local resection, and no recurrences were found after 1.5 to 20.0 years; 3 cases diagnosed as maxillary IMT involved in orbit, hard palate or pterygopalatine fossa received conservative therapy (prednisone, prednisone plus radiotherapy or prednisone plus chemotherapy), and no disease progression was found after 6, 9 or 2 years respectively; and 1 case diagnosed as maxillary IMT involved in orbit and pterygopalatine fossa was confirmed with cervical metastases after two operations and died of brain invasion within 17 months. One patient with localized lesion around the common carotid artery was treated with prednisone and had no disease progression with a 2-year follow-up.

CONCLUSIONSExtraorbital IMT of the head and neck is a rare clinical entity. Pathology examination is required for final diagnosis. Corticosteroid administration may be a choice of treatments, and radical resection should be taken selectively for limited lesions.

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

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

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