Ocular, Orbital, and Adnexal Toxicity With High-dose Volumetric Modulated Arc Radiation Therapy for Orbital Malignancies.

PURPOSE: Conventional modalities of external-beam radiation therapy (EBRT) are associated with high incidences of severe vision-threatening ocular and orbital toxicities when used to treat orbital malignancies. We investigate toxicities associated with high-dose volumetric modulated arc therapy (VMAT), a commonly used contemporary treatment modality for these tumors. METHODS: Retrospective analysis of malignant orbital tumors managed with adjuvant high-dose VMAT preceded by globe-salvaging surgical therapy (GST) or exenteration. Dosimetric quantitation of target volumes and critical structures was performed. Incidence and severity of ocular, orbital, and adnexal toxicities were evaluated and assessed with regard to conventional EBRT toxicities for orbital malignancies described in the literature. RESULTS: Eighty-four subjects (mean age = 65.9 ± 9.7 years) were included (N = 48 and N = 36 in GST and exenteration subgroups, respectively). Mean dose was 64.8 ± 2.1 Gy to the planning target volume. Dosing to critical structures typically did not surpass known tissue tolerance limits. Median follow up was 18.3 months. Visual acuity in the GST subgroup was not significantly different after VMAT (0.25 ± 0.06) compared with baseline (0.23 ± 0.02; P = 0.302). Whereas severe toxicities reported by major systematic analyses in the literature with older EBRT modalities were relatively common-for example, retinopathy (16-40%), optic neuropathy (16%), and corneal perforation (13%)-toxicities with VMAT were typically mild and less common. The most common toxicities with VMAT were mild dry eye (81.3%; 39/48), cataract (21.1%; 8/38 phakic eyes), and periocular dermatitis (15.5%; 13/84). Vision-threatening toxicities, including severe corneal pathologies, retinopathy, or optic neuropathy, were rare. There were no contralateral ocular or adnexal toxicities. CONCLUSIONS: High-dose VMAT for orbital malignancies demonstrated low incidence and severity of eye-related toxicity, in contradistinction to adverse events reported from conventional forms of radiotherapy.

[Bilateral orbital myeloid sarcoma: the circumstance of the discovery of acute myeloid leukemia (a case report)]. / Sarcome myéloïde orbitaire bilatérale: circonstance de découverte d´une leucémie aiguë myéloïde (à propos d´un cas).

Myeloid sarcoma is a rare ocular manifestation of acute myeloid leukemia. Bilateral manifestation preceding any clinical signs of leukemia is even rarer. We here report the case of a 16-month-old patient with rapidly progressive, inflammatory, acute bilateral exophthalmos associated with exposure keratitis. Computed tomography (CT) scan of the orbit and of the brain showed bilateral tissue-like infiltration into the orbital cavity. Blood tests showed biologic inflammatory syndrome, bicytopenia and circulating blasts 83%. Myelogram was performed based on the presence of circulating blasts; it showed acute myeloid leukemia (grade 4). Clinicians should suspect myeloid sarcoma in patients with bilateral exophthalmos and conduct a careful interpretation of blood test results.

[Orbital Manifestation of IgG4-Related Disease: Three Case Reports]. / Orbitale Manifestation der IgG4-assoziierten Erkrankung: eine Fallserie.

IgG4-related orbital disease is rare. It belongs to an entity of a multisystemic disorder - IgG4-related disease - which has emerged recently. Differential diagnosis comprises idiopathic orbital inflammation, endocrine orbitopathy and orbital neoplasms. MRI imaging and orbital biopsy are essential in making the diagnosis. Patients respond well to systemic steroids. We now describe three clinically markedly different manifestations of IgG4-related orbital disease.

A case of myeloid sarcoma presenting with an orbital mass, hearing loss, and multiple cranial neuropathies.

Lim SH, Nam HN, Lim KI, Jeon IS. A case of myeloid sarcoma presenting with an orbital mass, hearing loss, and multiple cranial neuropathies. Turk J Pediatr 2018; 60: 322-325. Primary myeloid sarcoma occurring in multiple sites; orbit, ear, brain, and spinal cord is a rare clinical entity. A 15-year-old male adolescent presented with bilateral orbital mass, hearing difficulty, and clinical signs of multiple cranial nerves palsy. Approximately 6 weeks later, acute myeloid leukemia was confirmed. This case alerts us that in patients with diverse sarcomatous lesions, acute myeloid leukemia presenting as myeloid sarcoma should be considered.

Incidental Orbital Neuroendocrine Metastases on 111In-OctreoScan and MRI.

Neuroendocrine tumors have a propensity to metastasize, but rarely to the orbits. A 69-year-old woman with history of neuroendocrine tumor of pancreatic primary underwent routine follow-up In-pentetreotide (OctreoScan) imaging, with 24-hour whole-body planar images showing subtle right periorbital tracer uptake that localized to extraocular muscles on subsequent SPECT/CT. Orbital MRI further defined the location of these highly suspicious orbital metastases, which were treated with external radiation, with follow-up MRI showing decreased size of the orbital metastases. Early identification and treatment of orbital metastases is critical to help preserve vision and quality of life.

Orbital Extranodal Marginal Zone Lymphoma Following Radiotherapy: A Report of 2 Cases.

PURPOSE: To present 2 patients in whom orbital radiation preceded the development of periorbital extranodal marginal zone lymphoma by more than a decade and to investigate the likelihood of this representing irradiation-induced malignancy. METHODS: Retrospective chart review and histopathologic study with immunohistochemistry of 2 cases. RESULTS: The first patient was a 58-year-old woman who developed an orbital mass within the vicinity of the lateral rectus muscle 17 years after external beam proton radiation therapy for an inferotemporal choroidal melanoma. The second patient was a 32-year-old woman who developed a mass in the right lacrimal gland 12 years after external beam photon radiation therapy for chronic inflammatory dacryoadenitis. Histopathologic and immunohistochemical studies confirmed orbital extranodal marginal zone lymphoma in both cases. Retrospective review of older histopathologic slides from the second patient revealed underlying immunoglobulin G4-related disease. DISCUSSION: The unusual sequence of events in these 2 cases raises the question of whether orbital radiation may in rare instances promote the development of orbital extranodal marginal zone lymphoma. The literature pertaining to irradiation-induced secondary malignancy in the orbit is reviewed. CONCLUSIONS: Clinicians should consider the possibility of a secondary malignancy when evaluating a patient with an orbital mass and a history of prior local radiation exposure.

Melanotic neuroectodermal tumor of infancy (MNTI) of the head and neck: A French multicenter study.

OBJECTIVES: Melanotic neuroectodermal tumor of infancy (MNTI) of the head and neck is a rare entity with uncertain clinical behavior. Radical surgical resection is the current recommended treatment, however this can cause severe aesthetic and functional sequelae. The aim of this study was to clinically characterize MNTIs and to stratify risk factors that may influence locoregional recurrence. METHODS: A retrospective multicenter study, including 11 patients from eight centers with a confirmed diagnosis of MNTI, was conducted. Epidemiological, clinical, radiological, pathological, and immunohistochemical examinations were reviewed. A statistical analysis using a t-test was conducted to calculate parameters correlating with tumor recurrence. RESULTS: MNTIs mainly occurred in the maxilla, with a mean age at diagnosis of 3.18 months (range: 0-6 months). Primary surgery was performed on 10 patients, with a clear margin resection on two patients. Overall recurrence rate was 27% with a survival of 100% at time of follow-up. No statistical correlation between recurrence rate, age at diagnosis, localization, resection margins, and pathological and immunohistochemical characteristics could be established. CONCLUSION: In our study, locoregional tumor recurrence did not seem to correlate with resection margins, so a conservative surgical approach may need to be considered to avoid functional and aesthetic sequelae.

Intravascular Papillary Endothelial Hyperplasia as an unusual diagnosis for peri-orbital tumour - A case report.

Intravascular papillary endothelial hyperplasia (IPEH) is a rare cause of orbital mass which can affect healthy individuals of any age/sex/race/region. It usually requires a histopathological examination, characterized by the appearance of papillary proliferation of vascular endothelial cells within the lumen of the blood vessel, for the final diagnosis. One should be aware that this is a highly vascular lesion which can cause excessive intraoperative bleeding and incomplete removal can lead to recurrences. IPEH of the orbit/eyelid has been reported in few parts of the world as isolated case reports but none from India so far.

Orbital diffuse large B-cell lymphoma with combined variable immunodeficiency.

Common variable immunodeficiency (CVID) is a primary immunodeficiency manifesting as a reduction in the level of total immunoglobulin (Ig) G, a reduction in the level of either IgA or IgM, poor response to polysaccharide vaccine, and usually frequent infections. The association of CVID with an increased risk of malignancy, specifically lymphoma, is well known. A 63-year-old female with a past medical history significant for CVID presented with a 1-month history of dull, left eye pain with proptosis, hypoglobus, and left upper lid fullness without a discrete palpable mass. Magnetic resonance imaging (MRI) of the orbits revealed a diffuse infiltrating orbital mass superonasally with extension into the superior rectus muscle, medial rectus muscle, and optic nerve up to the orbital apex and ethmoid sinus. A superonasal orbital biopsy with a caruncular approach was performed and demonstrated a sparse lymphoid infiltrate that was suggestive for a large B-cell neoplasm. Positron emission tomography (PET) scan demonstrated a hypermetabolic right lymph node, anterior to the right submandibular gland, which was biopsied and histopathology confirmed diffuse large B-cell lymphoma (DLBCL). Our patient achieved a very good response to chemotherapy with minimal residual disease on PET scan at the end of treatment. She attained a complete remission after radiation therapy. In conclusion, patients with new orbital and adnexa masses in the setting of a primary immunodeficiency can have an aggressive malignancy such as DLBCL and early diagnosis and systemic treatment carries a good prognosis.

Can the onset of orbital cancer be the result of a prosthetic eye?

Orbital exenteration is a disfiguring procedure performed for unresponsive orbital infections and control of recurrent benign tumours and malignancies arising from the eyelids (basal cell carcinoma, squamous cell carcinoma, conjunctival malignant melanoma), lachrymal glands (adenoid cystic carcinoma) or surrounding sinuses. In extremely rare cases the use of a prosthetic eye after enucleation can lead to anophthalmic socket tumours. We report the case of a 54-year-old man who had left eye enucleation due to recurring events of retinal detachment and who developed an invasive fast growing epidermoid carcinoma 30 years later. We review the literature to evaluate the rarity of the occurrence, time of onset after enucleation, treatments and outcomes. Our case illustrates the management of the pathology and emphasises the necessity of careful examination of the anophthalmic socket and the ocular prosthesis to identify any irregularities or damage on its surface even after exenteration that is not performed for malignant disease. Long-term follow up is necessary because this tumour could occur at long time periods after enucleation.

Contribution of Endothelial-to-Mesenchymal Transition to the Pathogenesis of Human Cerebral and Orbital Cavernous Malformations.

BACKGROUND: The analysis of gene-targeted mouse mutants has demonstrated that endothelial-to-mesenchymal transition (EndMT) is crucial to the onset and progression of cerebral cavernous malformations (CMs). It has also been shown that Notch and ephrin/Eph signaling are involved in EndMT. However, their roles in the pathogenesis of human intracranial CMs remain unclear. OBJECTIVE: To elucidate the contribution of EndMT, the Notch pathway, and ephrin-B2/EphB4 signaling to the pathogenesis of human intracranial CMs. METHODS: Eight human intracranial CMs (5 cerebral and 3 orbital CMs) were immunohistochemically investigated. RESULTS: CD31 (an endothelial marker) and EndMT markers, such as α-smooth muscle actin (a mesenchymal marker) and CD44 (a mesenchymal stem cell marker), were expressed in the endothelial layer of vascular sinusoids in all cases, suggesting that endothelial cells (ECs) have acquired mesenchymal and stem-cell-like characteristics and undergone EndMT in all cerebral and orbital CMs. EndMT was observed in about 70% and 35% of ECs in cerebral and orbital CMs, respectively. In all cases, Notch3 was expressed in the endothelial layer, indicating that ECs of vascular sinusoids have acquired mesenchymal features. In all cases, both ephrin-B2 and EphB4 were detected in the endothelial layer, suggesting that ECs of vascular sinusoids are immature or malformed cells and have both arterial and venous characteristics. CONCLUSION: EndMT plays a critical role in the pathogenesis of human cerebral and orbital CMs. Modulating EndMT is expected to be a new therapeutic strategy for cerebral and orbital CMs.

Recurrence after exenteration for canine orbital malignant schwannoma.

A 14-year-old Maltese dog presented with progressive exophthalmos and external deviation of the right eye. Ultrasonography revealed the presence of a retrobulbar mass and fine-needle aspiration cytology was performed, which detected a malignant mass. There was no evidence of metastasis on thoracic and abdominal radiography. Computed tomography showed no invasion into the bony orbit and no metastasis to the lung or lymph nodes. Exenteration was performed to remove the mass completely. Malignant peripheral nerve sheath tumor was confirmed by histopathological examination.

Orbital medulloepithelioma in an adult patient: Radiation-induced second neoplasia?

Second cancers in survivors of hereditary retinoblastoma occur much more commonly than in the general population. This can be attributed both to the germline mutation of the RB gene and chemoradiation used for treatment of this paediatric cancer. Medulloepithelioma is an uncommon tumor of neuroectodermal origin, seen largely in the paediatric population and rarely reported in adults. Though the incidence of second malignancies is common in retinoblastoma, medulloepithelioma as a second malignancy in retinoblastoma survivors is rare, with only one case reported so far. Herein, we present a case of a 29-year-old patient presenting with medulloepithelioma of the right orbit, arising in the radiation field of previously treated retinoblastoma. This case was also peculiar in that though the origin of tumor was in the eyeball it had a very aggressive clinical course.

A case of radiation-induced mucosal melanoma in an immunohistochemically S-100-negative patient.

We report a case of radiation-induced mucosal melanoma in a 41-year-old woman with a history of childhood rhabdomyosarcoma of the nasal cavity that had been treated with radiotherapy. During the workup for the melanoma, the patient was found to be negative for S-100 protein on immunostaining. While many melanotic markers for the histologic confirmation of melanoma exist, they can be negative in some cases, such as ours. To the best of our knowledge, only 1 case of radiation-induced melanoma has been previously reported in the English-language literature, and in that case the patient was S-100-positive. Although our case is rare, it suggests another possible long-term adverse effect of radiotherapy. We also describe the morphologies and histology associated with diagnosing melanoma in an S-100-negative patient.

Traumatic Presentation of a Periorbital Dermoid Cyst: A Case Report.

Dermoid cysts are largely considered benign, developmental neoplasms that frequently present during childhood. Orbitofacial dermoids represent a unique group of embryologically derived soft tissue masses that often present as localized, well-circumscribed swellings along the embryonal suture lines. Clinical presentation is variable, but in rare instances, may be preceded by local trauma, possibly suggesting an inciting event as the initial stimulus to cyst enlargement. Although dermoid cysts tend to remain clinically benign, their natural history of gradual enlargement necessitates complete surgical excision to prevent complications.

Unusual case of traumatic neuroma of the orbit.

Traumatic or amputation neuromas are neoformations developing after damage to a peripheral nerve. They are not proper tumors but rather a reactive process or a frustrated attempt of nerve regeneration. Traumatic neuromas are potentially found in every sensory peripheral nerve and often at the site of past surgical intervention, including orbital surgery. A 29-year-old Northern African migrant presented progressive exophthalmos and progressive loss of acuity in left eye, which had started about 6 months before after a cranio-facial trauma caused by a violent assault. MRI of the orbits showed a massive intra-orbital, intra-conical lesion, clearly compressing and dislocating the optic nerve and extending posteriorly to the orbital apex. Surgery was performed through lateral approach of Kroenlein and led to complete excision of the lesion. Histology revealed fibrotic, adipose and striated muscle tissues, a disordered, non-neoplastic overgrowth of small and large fascicles of nerves, inflammatory infiltrates, and fibrosis with sparse calcifications were diffusely observed in a background of fat, scar and striated muscle tissued. Patient was discharged on the fifth day in good health condition, without deficit of eye motion but without recovery of visual acuity. In conclusion, this case demonstrates that traumatic neuromas may arise in the orbit in patients with minor direct trauma to nerves and without previous surgical treatment.