OBJECTIVE: Hemophilic pseudotumor (HP) is a very rare complication of hemophilia seen in only 1-2% of the cases. Although it is much more common in long bones, pelvis and small bones of hands and feet and very rarely involving jaw bones.
RESULTS: In the present case, the presence of a rare hemophilic pseudotumor of the mandible with the positive history of Hemophilia B justifies that the history, clinical and radiological examinations were sufficient to arrive at conclusive diagnosis precluding invasive diagnostic procedures such as biopsy hence avoiding the risk of hemorrhage, infection, or fistula. This case also highlights that patient was conservatively managed with Factor IX replacement alone with a very good clinical outcome.
CONCLUSIONS: HP should be considered as a differential diagnosis of any progressive swelling of hard and soft tissues occurring in a patient with severe haemophilia.

The uncommon and mysterious pulmonary inflammatory myofibroblastic tumor (PIMT) primarily affects children and young people. PIMT is characterized by the proliferation of myofibroblastic spindle cells mixed with inflammatory cells. It can resemble both benign and malignant disorders, both radiographically and clinically. PIMT typically manifests as a solitary lung tumor. The genesis of the tumor is linked to genetic anomalies, including those related to the ALK gene (anaplastic lymphoma kinase); nonetheless, some cases are not ALK-positive, indicating genetic variability. Clinically, patients may have non-specific symptoms such as cough, chest pain, or hemoptysis, or they may not exhibit any symptoms at all. In these cases, imaging tests may unintentionally reveal unrelated conditions. From a histopathological perspective, PIMT is characterized by a heterogeneous cellular makeup, encompassing lymphocytes, myofibroblasts, plasma cells, and histiocytes, which generally exhibit a fascicular or storiform pattern. The diagnosis is verified using immunohistochemical labeling, molecular research, and histological examination. The cornerstone of treatment is still surgical resection, which has a good prognosis and a low recurrence rate. On the other hand, specific treatments, such as ALK inhibitors, have shown promise for incurable or recurring instances. Even though PIMT usually has a benign history, it is important to comprehend its biological behavior and molecular foundations for precise diagnosis and efficient management. This underscores the need for additional study into the pathophysiology and potential treatments of PIMT. This report presents a case of a 53-year-old female who presented with complaints of breathlessness and chest pain and was diagnosed with the condition accidentally.

Meningitis is a significant health concern globally, with enterovirus (EV) being the most common cause of viral meningitis in adults. We discuss the case of a 57-year-old female patient with enteroviral meningitis manifesting as pseudotumor cerebri, posing significant clinical challenges. She presented with symptoms, signs, and radiological evidence suggesting idiopathic intracranial hypertension. The CSF analysis showed pleocytosis, which led to further investigations that unveiled a positive case of EV by real-time reverse transcription polymerase chain reaction analysis. This case highlights the fact that not all cases of raised intracranial pressure are detrimental or recalcitrant. It accentuates the need for thorough diagnostic evaluation and emphasizes the potential for favorable outcomes with conservative management.

Unilateral hypertrophy of the Tensor Fasciae Latae (TFL) muscle is a rare condition often characterized by a palpable mass in the lower limbs or hip pain. Despite its rarity, several causative factors have been identified, necessitating accurate diagnosis and appropriate management. Here, we present the case of a 53-year-old patient who sought outpatient consultation for a mass in the anterolateral aspect of the right thigh. Through this case study, we aim to contribute to the limited literature on this condition by discussing our diagnostic approach, management plan, and outcomes. Upon presentation, the patient underwent a thorough physical examination, revealing a non-tender, sessile mass seemingly originating in the deep connective tissue of the thigh. A magnetic resonance image (MRI) was performed to confirm the diagnosis and assess the extent of muscle involvement. This noninvasive modality provided valuable insights into the nature and localization of the mass, providing the diagnosis and guiding subsequent management decisions. Given the benign nature of the condition and absence of associated symptoms, conservative management was favored. Physical therapy focusing on stretching and strengthening exercises was initiated to address the underlying probable causes and improve functional capacity. Close monitoring through regular follow-up appointments was also recommended to track the progression of the hypertrophy and ensure symptomatic relief. Unilateral hypertrophy of the TFL muscle is a rare entity that presents diagnostic and management challenges. Through our case study, we have highlighted the importance of a comprehensive diagnostic workup, including imaging studies, in confirming the diagnosis and guiding management decisions. Conservative approaches, such as physical therapy, can effectively manage symptoms and improve quality of life in affected individuals. Continued research and documentation of cases are essential to expand our understanding of this condition and refine treatment strategies.

Total hip arthroplasty (THA) is the best surgical approach for treating advanced hip degeneration, providing pain relief, and improved function in most cases. In the past, MR imaging quality has been highly compromised by in-plane distortions, inadequate fat saturation, and other artifacts due to metal components of THA. Technological advancements have made pathologic conditions, which were previously hidden by periprosthetic artifacts, outstanding features due to the optimization of several sequences. To date, several short and long-term complications involving bony and soft-tissue structures may be detected through magnetic resonance imaging (MRI). The use of MRI with adapted sequences and protocols may drastically reduce artifacts thereby providing essential pre-operative elements for planning revision surgery of failed THA. This review has the purpose of conveying new insights to musculoskeletal radiologists about the techniques to suppress metal-related artifacts and the hallmark MRI findings of painful THA. CRITICAL RELEVANCE STATEMENT: Advancements in metal-suppression have given radiologists the opportunity to play an emerging role in THA management. This article provides technical and imaging insights into challenges that can be encountered in cases of THA, which may present complications and characteristic imaging findings. KEY POINTS: Imaging total hip arthroplasty requires adapted MRI protocol and awareness of the common complications. We have reported the available metal-suppression sequences for evaluating total hip arthroplasty. Many structures and conditions should be considered when dealing with painful aseptic or septic arthroplasty.

Inflammatory myofibroblastic tumors (IMTs) of the lung are a rare type of mesenchymal tumors that tend to occur more in the lungs of children. They are extremely rare in adults. IMTs require extensive pulmonary resection because they are commonly locally invasive. The key to preventing recurrence is complete resection, and the prognosis is excellent after surgery. We report a case of a patient with an inflammatory pseudotumor of the lung. The patient is a 27-year-old female who presented with a dry cough. A chest radiograph and computed tomography showed a lesion in the left main bronchus and near-total left lung collapse. As surgery was necessary to establish the diagnosis, left pneumonectomy was performed followed by a histological examination of the surgical specimen which confirmed inflammatory pseudotumor.

UNASSIGNED: Fibromatosis colli (FC) is a rare pseudotumor of the sternocleidomastoid muscle with an incidence of 0.4%, generally diagnosed using ultrasound between 2 and 4 weeks of age. This is an important entity considering the clinical concerns it causes due to its appearance as a cervical mass with torticollis. Few magnetic resonance imaging (MRI) descriptions of its appearance have been made, with the existing reported cases being sporadic. We aim to provide a thorough description of this paediatric entity.
UNASSIGNED: We conducted a retrospective study by searching our hospital\'s database for previous cases of FC where an MRI had been performed. We found six cases of FC where an MRI had been performed. Of these cases, five out of six were contrast-enhanced. We examined the MRIs to be able to discern and describe the MRI characteristics of FC.
UNASSIGNED: We found that FC presents a T1 signal isointense to the muscle, a T2 signal hyperintense to the muscle, a variable diffusion signal and a thick enhancing peripheral ring after contrast administration.
UNASSIGNED: Our results match what has been reported in the literature to date regarding the MRI signal of FC, confirming previous reports. However, we provide new data regarding the characteristic appearance post-enhancement, which was previously unreported.
UNASSIGNED: The MRI characteristics of FC have rarely been described, with only a few isolated case reports in the medical literature. We review the current literature, describe the key MRI characteristics of the pathology, and provide the most thorough description to date.

UNASSIGNED: IgG4-related disease is a rare and emerging pathology, characterized by the appearance of pseudotumors. Due to the ability to mimic other pathologies, it is essential to consider it as a differential diagnosis in multisystemic processes. The diagnosis is challenging, requiring a multidisciplinary approach, to minimize the associated morbidity and mortality.
UNASSIGNED: IgG4-related disease (IgG4-RD) is a rare, emerging, systemic and chronic pathology, characterized by the appearance of pseudotumors resulting from tissue infiltration by IgG4-positive plasma cells that promote eosinophilic inflammation of the tissue with subsequent fibrosis. We present the case of a male, 45-year-old patient, with marked weight loss and skin pallor detected by his family doctor during a child health consultation of his daughter. When questioned, the patient referred complaints of postprandial discomfort in the left hypochondrium with a feeling of fullness, weight loss, chronic fatigue and hyperhidrosis that had lasted for a month. On physical examination, he was pale, and had pain at palpation of the left hypochondrium. Laboratory data showed increased inflammation markers, abdominal ultrasound and CT demonstrated numerous enlarged lymph nodes in the upper quadrants, raising concern for a malignant lymphoproliferative process. Serological, imaging, clinical and laparoscopic excisional biopsy revealed features of IgG4-related disease and excluded malignant lymphoproliferative disease. The immediate response to treatment with oral prednisolone 30 mg/day also contributed for diagnosis confirmation. Due to refractory disease after gradual prednisolone reduction, second-line therapy with rituximab was initiated. Over the 6 years of follow-up, the patient presented multiple exacerbations characterized by the emergence of systemic symptoms, being maintained under close clinical and imaging follow-up by reumathology, infectious diseases, and family medicine specialists.

OBJECTIVE: Inflammatory myofibroblastic tumors (IMTs) are rare, solid, potentially malignant lesions of uncertain etiology. Histologically, IMTs exhibit a combination of lymphocytes and inflammatory cells within a fibroblastic myxoid layer. The diagnosis of IMTs poses a challenge for various medical specialties, including surgeons, pathologists, and oncologists, due to their non-specific clinical presentation. Furthermore, radiologists face difficulties in interpreting computed tomography (CT) or magnetic resonance imaging (MRI) results, which often yield polymorphic and inconclusive findings. Ultimately, histopathologists play a crucial role in reaching a definitive diagnosis based on the tumor\'s histological characteristics. They are detected in every system of the human body, most commonly in the lungs. Here, we report an uncommon occurrence of IMT in the spleen of a patient with nonspecific abdominal pain.
METHODS: A 56-year-old Caucasian female presented to Konstantopouleio General Hospital of Nea Ionia, Athens, Greece, with abdominal pain and discomfort. The patient had no significant medical history and normal laboratory tests. An abdominal CT revealed a large mass in the spleen. A splenectomy was performed. Histopathological analysis of the tumor revealed IMTS.
CONCLUSIONS: Splenic IMT is a rare benign tumor with moderate malignant potential. It lacks a distinct clinical presentation and is typically identified either incidentally or during the examination of abdominal pain.

Tuberculosis poses a significant public health challenge, especially in highly endemic countries. Rarely, it appears as an abdominal mass resembling a malignant abdominal tumor and can be misleading on imaging, so early diagnosis remains a challenge, and confirmation may require invasive examinations such as laparotomy. The most characteristic radiological appearance is that of a solid, hypervascular, or peripherally enhancing mass with a hypodense center. We present a case of retroperitoneal tuberculosis that simulated a teratoma on imaging. This case highlights the diagnosis difficulties even in endemic countries, despite advances in imaging techniques such as ultrasound and computed tomography.