Aggressive Metastatic Inflammatory Myofibroblastic Tumor After Allogeneic Stem Cell Transplant With Fatal Pulmonary Toxicity From Crizotinib.

Inflammatory myofibroblastic tumors (IMTs) are rare tumors with an intermediate spectrum of biological behavior. IMTs are uncommon secondary malignancies after hematopoietic stem cell transplant. The presence of anaplastic lymphoma kinase rearrangements in 50% of IMTs has led to therapeutic trials with crizotinib, although limited experience remains with crizotinib use in children. We describe the first reported case of a highly aggressive and metastatic IMT (secondary malignancy) in an 8-year-old girl following umbilical cord blood transplant. Although tumor response was demonstrated with anaplastic lymphoma kinase inhibition, she later developed fatal pulmonary toxicity from diffuse alveolar damage, a feature felt most likely to be due to crizotinib.

Myofibroblastic tumor of the esophagus - a case report of long-term follow-up and literature review.

BACKGROUND: Inflammatory myofibroblastic tumor (IMT) is a rare mesenchymal neoplasm with intermediate malignant potential. Although most often seen in the lungs, it can occur at multiple anatomical locations, including the gastrointestinal tract. An esophageal lesion is extremely rare, however. IMTs present most commonly in children and young adults. The main therapeutic approach is surgical resection. CASE REPORT: We report on the follow-up of a case in a 13-year-old boy with IMT in the esophagus. He underwent surgical resection in 2013 and is free of disease to date. CONCLUSION: Surgical resection is the most preferred therapy. If the resection is complete, the risk of recurrence is low. Nevertheless, every patient should be carefully followed up after the resection.

Inflammatory myofibroblastic tumour causing intestinal obstruction in a patient with neurofibromatosis type 1.

Inflammatory myofibroblastic tumours (IMTs) are rare tumours with unpredictable biological behaviour ranging from benign to locally invasive and rarely, distant metastasis. While neurofibromatosis type 1 (NF1) may manifest with gastrointestinal soft tissue tumours, this is the first report in the literature that describes an IMT occurring in a NF1 patient who presented with intestinal obstruction. Our patient presented with intestinal obstruction secondary to an obstructing terminal ileum mesenteric tumour. En bloc bowel resection was performed, with histology revealing an IMT and an adjacent neurofibroma. The resection margins were clear and the patient was free of recurrence at six months.

Primary mouse myoblast purification, characterization, and transplantation for cell-mediated gene therapy.

The transplantation of cultured myoblasts into mature skeletal muscle is the basis for a new therapeutic approach to muscle and non-muscle diseases: myoblast-mediated gene therapy. The success of myoblast transplantation for correction of intrinsic muscle defects depends on the fusion of implanted cells with host myofibers. Previous studies in mice have been problematic because they have involved transplantation of established myogenic cell lines or primary muscle cultures. Both of these cell populations have disadvantages: myogenic cell lines are tumorigenic, and primary cultures contain a substantial percentage of non-myogenic cells which will not fuse to host fibers. Furthermore, for both cell populations, immune suppression of the host has been necessary for long-term retention of transplanted cells. To overcome these difficulties, we developed novel culture conditions that permit the purification of mouse myoblasts from primary cultures. Both enriched and clonal populations of primary myoblasts were characterized in assays of cell proliferation and differentiation. Primary myoblasts were dependent on added bFGF for growth and retained the ability to differentiate even after 30 population doublings. The fate of the pure myoblast populations after transplantation was monitored by labeling the cells with the marker enzyme beta-galactosidase (beta-gal) using retroviral mediated gene transfer. Within five days of transplantation into muscle of mature mice, primary myoblasts had fused with host muscle cells to form hybrid myofibers. To examine the immunobiology of primary myoblasts, we compared transplanted cells in syngeneic and allogeneic hosts. Even without immune suppression, the hybrid fibers persisted with continued beta-gal expression up to six months after myoblast transplantation in syngeneic hosts. In allogeneic hosts, the implanted cells were completely eliminated within three weeks. To assess tumorigenicity, primary myoblasts and myoblasts from the C2 myogenic cell line were transplanted into immunodeficient mice. Only C2 myoblasts formed tumors. The ease of isolation, growth, and transfection of primary mouse myoblasts under the conditions described here expand the opportunities to study muscle cell growth and differentiation using myoblasts from normal as well as mutant strains of mice. The properties of these cells after transplantation--the stability of resulting hybrid myofibers without immune suppression, the persistence of transgene expression, and the lack of tumorigenicity--suggest that studies of cell-mediated gene therapy using primary myoblasts can now be broadly applied to mouse models of human muscle and non-muscle diseases.

An inflammatory myofibroblastic tumor in the transplanted liver displaying quick wash-in and wash-out on contrast-enhanced ultrasound: A case report.

RATIONALE: Inflammatory myofibroblastic tumor (IMT) is an uncommon mesenchymal neoplasm, and its presence in a grafted liver is exceedingly rare. PATIENT CONCERNS: A 54-year-old woman was admitted to our hospital with a half-month history of intermittent melena. She had undergone deceased-donor liver transplantation (LT) for hepatitis B virus related liver cirrhosis without hepatocellular carcinoma 5 months previously. DIAGNOSIS: Laboratory examination showed impaired liver and renal functions and Epstein-Barr virus (EBV) infection, but tumor markers within normal ranges. Gastroscopy showed esophageal varices. Ultrasound and computed tomography angiography revealed an ill-defined and irregular solitary lesion in the porta hepatis, encasing both the portal vein and the hepatic artery. The lesion was characterized by arterial hyper-enhancement and hypo-enhancement in the remaining phases with contrast-enhanced ultrasound (CEUS). The lesion was finally confirmed as an IMT by ultrasound-guided biopsy. INTERVENTION: The patient received conservative treatment, including immunosuppression, endoscopic variceal ligation, antibiotics, steroids, and antiviral agents. OUTCOME: The patient's gastrointestinal bleeding was controlled, but the symptoms associated with portal hypertension worsened. Attempts to perform a transjugular intrahepatic portosystemic shunt were unsuccessful, and she unfortunately died soon after. LESSONS: A differential diagnosis of IMT should be considered in LT recipients presenting with EBV infection, normal tumor markers, and a de novo hepatic lesion with quick wash-in and wash-out on CEUS. Ultrasound is associated with the advantages of convenience and nonionizing radiation, and should thus be the priority approach for monitoring transplanted liver.

Spindle cell lipoma-like tumor, solitary fibrous tumor and myofibroblastoma of the breast: a clinico-pathological analysis of 13 cases in favor of a unifying histogenetic concept.

We reviewed the clinico-pathological features of a series of 13 cases of benign spindle stromal tumors (BSSTs) of the breast relating to a basic common theme consisting of a well-circumscribed proliferation of vimentin+/CD34+/BCL-2+/CD99+ spindly to oval-epithelioid cells, variably arranged in haphazard to short fascicular growth pattern, with interspersed thick or thin collagen bands. Morphological variations included atypical mono- or multi-nucleated cells in five cases and a mature lipomatous tumor component, varying from focal to prominent, in eight cases. Based on morphological and immunophenotypical features, a distinction was made between two main subtypes of these tumors--fibroblastic and myofibroblastic. The former subtype included two cases respectively represented by a typical solitary fibrous tumor (SFT) and a neoplasm labeled "spindle-cell lipoma (SCL)-like tumor", closely reminiscent of soft tissue SCL. Both tumors had cells with fibroblastic-like appearance, haphazardly arranged and immunoreactive for vimentin, CD34, BCL-2, and CD99. The latter subtype, comprised nine cases exhibiting evidence of myofibroblastic differentiation (desmin and alpha-smooth muscle actin) which were classified as myofibroblastomas (MFBs). The remaining two cases were defined as "mixed BSSTs", having typical features of diverse neoplasms, respectively represented by a case of MFB with focal SFT and pleomorphic/SCL-like areas, and SFT with focal MFB-like component. The common basic morpho-immunophenotypical features, the possibility that both fibroblastic and myofibroblastic tumors may contain an additional mature lipomatous component, and the existence of hybrid stages (mixed BSSTs) strongly support the view that such tumors belong to the same category of lesions. We postulate that the precursor of all these neoplasms is the vimentin+/CD34+ cells of the mammary stroma, the well-known inherent plasticity of which to differentiate toward several mesenchymal lines, provides the explanation for the phenotypic heterogeneity of these neoplasms. Accordingly, the encompassing term "benign spindle stromal tumors of the breast" is advocated for such tumors.

Possible reasons for the high resistance of muscle to cancer.

Muscle, particularly striated muscle, is highly resistant both to primary and to metastatic cancer. This resistivity is thought to be connected with the lactic acid producing activities of tumors. Lactic acid is an anoxia signal in the body, to which blood vessels tend to respond with a sprouting reaction, new vessels seeking out the source of anoxia and vascularising it. The reaction of the body to incipient cancer is probably two-fold. Fibroblasts treat them as foreign bodies and attempt to encapsulate them, while blood vessels tend to perpetuate them by supplying them with nutrients. The fate of the tumor may be decided by the relative speed of the two reactions. Muscles are lactic acid producers themselves, hence their blood vessels must be conditioned to a greater tolerance of it than in other tissues. This may be the crucial factor in preventing incipient tumors from establishing themselves in muscle.

Changes in the frequency and size of smooth muscle tumors in Japanese quail lines differing in body weight.

The purpose of this investigation was to study the incidence and size of smooth muscle tumors in several Japanese quail lines and to report recent correlated changes in mature BW and egg production. Laying females from lines selected solely (HW) or partly (HW-HP; HW-LP) for increased 4-wk BW or for decreased 4-wk BW (LW) and from the corresponding randombred control (R1) were used. Lines HW-HP and HW-LP were sublines of Line HW in which males were selected for increased 4-wk BW and females were selected for high or low level of total plasma phosphorus, respectively. Laying hens were examined for the presence of smooth muscle tumors after about 170 d of egg production (240 d of age). During Generations 19 through 26, mature BW was increasing in the HW line and decreasing in the LW line. Selection for either increased or decreased 4-wk BW resulted in decreased egg production, but the only significant change with generations was a decrease of 2.7 eggs per hen for a 120-d laying period in the LW line. Frequency and weight of the smooth muscle tumors were greater for females from the large-bodied lines than females from Line R1. No tumors were detected in LW females. Based on the linear regression of response on generations, tumor frequency was increasing in Line HW-LP but tumor weight was decreasing in this line. Tumor weight was increasing in the HW line. No other changes in tumor frequency or size were noted across generations. Weight of the tumors was not correlated with egg production. The presence of tumors did not seem to affect mortality during the laying period. The Japanese quail lines may serve as a useful animal model for the study of smooth muscle tumors in humans, chickens, and turkeys.

[Present status of granular cell tumors. Apropos of 8 new cases with tracheobronchial localization]. / Actualité des tumeurs à cellules granuleuses. A propos de 8 nouvelles observations de localisation trachéo-bronchique.

The authors report 8 new cases of granular cell tumour of Abrikossoff's tumour located in the trachea or bronchus. After briefly recalling the generally accepted features of this disease, they report several new aspects: the obviously under-estimated frequency, the absence of progression, requiring therapeutic abstention and regular follow-up, the epidemiological problems posed by the association with chronic bronchitis or the coexistence with a malignant bronchial tumour, the uncertainties which still surround the histogenesis, which is partly mesenchymal and partly nervous tissue, more particularly Schwann cells, which can be supported by ultrastructural arguments.

[Granular-cell tumor of the larynx]. / Tumor de células granulares de laringe.

Laryngeal granular cell tumors are rare. The interest of this subject is their peculiar histogenesis, because there is no general agreement on it. The AA. rapport one case in a woman aged 32, and review closely the related literature.

Inflammatory myofibroblastic tumor of the urinary tract following a TVT.

The complications related to the retropubic placement of polypropylene mesh (TVT) for stress urinary incontinence have been extensively described in the literature. The occurrence of an inflammatory myofibroblastic tumor, however, has not been previously reported as a complication of placement of a mesh sling. We report such a case in a patient with neurofibromatosis who had undergone a TVT for stress urinary incontinence and present a brief review of the literature.

Pediatric multifocal myofibroblastic tumors with involvement of the gallbladder: HIV- and Epstein-Barr virus-associated smooth muscle cell tumors.

Epstein-Barr virus associated smooth muscle cell tumors are commonly found in immunocompromised patients. These tumors occur most commonly in patients with AIDS and with greater incidence in children. The incidence of gallbladder tumors in these patients is rare, however. We report the case of a 10-year-old female patient who presented to our unit. She is HIV positive and on antiretroviral treatment. She required an emergency cholecystectomy to relieve external compression of the common bile duct where an empyematous gallbladder was found. Histopathology confirmed the presence of an Epstein-Barr virus-associated smooth muscle tumor. She is noted to have other asymptomatic lesions. Surgical intervention is reserved for symptomatic lesions and improves the immunocompromised state, although there is a propensity for local recurrence of the tumor.

Agressive inflammatory myofibroblastic tumor of the liver with underlying schistosomiasis: a case report.

Inflammatory myofibroblastic tumor (IMT) occurs infrequently in the liver. It is controversial whether it represents a low grade mesenchymal neoplasm or a reactive inflammatory lesion. Local recurrence and metastasis are rare and some tumors are associated with infectious agents. We report on a case of a large and partially resected IMT with local recurrence and diaphragm and kidney infiltration detected on routine surveillance two years later. Histologically, the tumor showed spindle cells without atypia, mitosis or necrotic areas in a myxoid and collagenized background with inflammatory cells. In the liver portal tracts, granulomatous lesions with viable eggs of Schistosoma mansoni were identified. Immunohistochemistry demonstrated spindle cells which were smooth-muscle actin and vimentin positive. In conclusion, this case points out that these histological patterns do not predict the aggressive biological behavior of the lesion. A reason for the recurrence and the infiltration may be incomplete tumor resection. Further investigation is necessary in order to better clarify an infectious cause in some IMTs.