Echinococcosis, or hydatid disease, is a parasitic infection caused by a cestode from the Taeniidae family, mainly by Echinococcus multilocularis or granulosus. It is predominantly seen in the lungs or the liver. The hydatid disease rarely manifests as a palpable mass in the muscles. This study reports a case of a 70-year-old male who has presented with a swelling in the anterolateral aspect of his right upper thigh, which was progressive over the past two years. The swelling was initially painless and is now associated with pain. The clinical diagnosis of an abscess was suspected. The diagnosis of his swelling was later made as a hydatid cyst in a muscle of the thigh based on the imaging modalities, the ultrasound, and an MRI. The patient underwent surgical excision of the cyst, following which the diagnosis of a hydatid cyst was confirmed on the biopsy.

In this study, we discuss the clinical, radiological, and histopathological characteristics of intramuscular myxomas (IMM), a rare form of benign soft tissue tumors. We report the case of a 47-year-old female patient presenting with a painless, non-inflammatory mass in the right thigh, which was mobile relative to both superficial and deep planes. Imaging, biopsy, and subsequent histopathological study established the diagnosis of intramuscular myxoma. The patient underwent surgical excision of the mass, with a straightforward postoperative course. It is important to distinguish IMM from malignant tumors, such as soft tissue sarcomas, through comprehensive examinations including imaging and biopsy. The recommended treatment is surgery for complete excision of the mass, with an exceptionally low recurrence rate.

Synovial sarcoma (SS) is a rare tumour of unknown origin with peak incidence between 10 and 35 years. Although it arises in juxta-articular location, SS is a misnomer and has no true relationship with synovium. In this case report, we present an elderly female patient with a long-standing history of thigh mass which was initially misdiagnosed as metastatic adenocarcinoma deposits on fine needle aspiration cytology, and again misdiagnosed as malignant adnexal skin tumour on core needle biopsy and referred for further management. Here, we discuss the challenges faced in the diagnosis of SS on a small biopsy and ways to differentiate it from other morphological mimickers. Therefore, we aim to increase the awareness of soft tissue tumours that microscopically appear like adenocarcinoma, which is a potential diagnostic pitfall. We also highlight the importance of morphological diagnosis and the utility of molecular testing using fluorescence in situ hybridisation, to arrive at the correct diagnosis of SS.

A 55-year-old female presented with elastofibroma of the thigh. On presentation, she complained of a palpable, painful mass on the anterolateral right thigh that had been present for one year. She had a history of surgery for a right femur fracture. On MRI, a soft-tissue mass was seen in the vastus intermedius muscle, as a heterogeneous lesion with streaky fatty and fibrous components. The fibrous component was isointense to the muscle, and the fatty component had a high signal on both T1- and T2-weighted images. Histopathological analysis after biopsy established the diagnosis of elastofibroma.

Lymphangiomas are benign tumours, almost exclusively found in children. Primary work-up includes imaging. We report a case of lymphangioma in the leg in an adult patient, initially masked as a myxoma. Our patient underwent ultrasound, computerised tomography, and magnetic resonance imaging, which were suggestive of myxoma. Treatment for lymphangioma varies from sclerotherapy to definitive surgical management. In our case, surgical management was selected under consideration of myxoma; however, histopathology confirmed lymphangioma. Lymphangiomas in adult patients can be masked by other conditions and should be considered as a differential in lower leg swellings.

Aneurysmal bone cysts (ABCs) are benign lesions that are locally invasive. The prevalence of soft tissue ABCs is far lower than the intraosseous type. Here, we report a case of ABC in thigh muscles who presented with distal thigh pain.

Hypertrophy of the tensor fascia lata muscle is a rare entity that may be observed in patients presenting with a palpable mass in the antero-lateral aspect of the proximal thigh area. Imaging confirms the diagnosis of such a rare entity. This case report highlights a case of isolated hypertrophy of the tensor fascia lata muscle with no identifiable etiology. Biopsy and surgical intervention were not needed due to the interval stability throughout a three-year period. The orthopedic oncology team reassured the patient and followed up the patient annually.

Ganglionic cysts are common swellings of the hands. Various mechanisms are thought to generate these lesions, such as cystic mucoid degeneration and inflammation. Typically, ganglionic cysts are asymptomatic but can cause pain. They usually originate from soft tissues like ligaments, joint capsules, and sheaths of tendons. We present the case of a 37-year-old man with mid-thigh swelling with intermittent mild pain. However, no systemic symptoms like fever or weight loss were present. Workup unmasked the presence of a rare intratendinous ganglionic cyst. Ultrasonography (USG) and magnetic resonance imaging (MRI) can confirm the presence of ganglionic cysts and estimate their sizes and relationships with the surrounding structures. Treatment options range from observation and conservative management to interventions like aspiration and surgical excision.

UNASSIGNED: Morel-Lavallée (MLL) is an uncommon entity that is missed by many physicians, it is the result of a shearing force that leads to degloving of the subcutaneous fat from the underlying deep fascia.
UNASSIGNED: We present a case of a 15-year-old male patient who presented 3 months after the initial crush injury with a large MLL lesion at the lateral aspect of the right proximal thigh. He was treated with incision and drainage with compressive dressing and a negative pressure drain.
UNASSIGNED: Diagnosis of MLL is usually clinical and can be aided with radiological tools like MRI that is the gold standard of imaging in this lesion. Several treatment options are available, ranging from conservative treatment with compressive bandages to percutaneous drainage, injection of sclerotic agents, and surgical treatment with incision, drainage, and debridement. Diagnosis and treatment should be familiar to all caregivers to prevent further complications that could be life or organ-threatening.

Adiposis dolorosa or Dercum\'s disease is a rare lipomatous disorder characterized by painful lipomas. In this article, we report a case of rather large exophytic adiposis dolorosa causing difficulties with ambulation, and our surgical management of the disorder. To our knowledge, this is the first reported case of a large exophytic adiposis dolorosa of the upper medial thigh causing problems with mobility. This is also the first reported case of the use of a delayed split-thickness skin graft (STSG) after interval use of wound vacuum-assisted closure (VAC) following dermolipectomy. A 77-year-old female presented with a chronic mass on the medial aspect of her right thigh for over 40-50 years. She had noticed a recent rapid increase in size, causing some discomfort and interference with mobility and activities of daily living. The patient underwent an MRI with finding consistent with adiposis dolorosa. She underwent dermolipectomy and reconstruction of the resulting defect with a combination of partial primary closure, wound VAC, and delayed closure using STSG. Dermolipectomy with interval application of a wound VAC combined with delayed reconstruction with STSG is a feasible option for patients with large lesions of the extremity that causes difficulty with mobility and activities of daily living.