1,721,035 research outputs found
Acinic cell carcinoma arising in a lacrimal gland. First case report.
No full textAcinic cell carcinoma is a rare neoplasm nearly always observed in the salivary glands. Our experience documents a case of this pathology, occurring in the lacrimal gland, never reported in the literature before. A 59-year-old white woman was admitted with reduced vision and a painless swelling in the area of the
right lacrimal gland. Computerized axial tomography showed an intraorbital radio-opaque mass compressing the eyeball from behind. The patient underwent right temporal orbitotomy and total removal of the lesion. The surgical specimen was constituted by a cystic mass containing citrine liquid. Microscopic
examination proved the lesion to be an acinic cell carcinoma. Differential diagnostic problems and similarity to salivary gland acinic tumors are discussed
Optical coherence tomography angiography in nonarteritic anterior ischemic optic neuropathy due to optic nerve head drusen
Full text linkOptic nerve head drusen (ONHD) are typically benign hyaline and calcified concretions located within the optic nerve. Initially asymptomatic, they can increase slowly in size and number over time, and they can cause mechanical stress at the axons of the optic nerve and progressively lead to a loss of the visual field and papillary vascular changes. Here, we reported a rare case of a young patient with bilateral ONHD complicated by a nonarteritic anterior ischemic optic neuropathy (NAION) in the right eye. The aim of this case was to evaluate, using optical coherence tomography angiography (OCTA), the vascular network of the papillary region in both eyes in the presence of this ischemic event associated to ONHD. At OCTA examination, the whole papillary region revealed a general rarefaction of the vascular network, but it turned out to be greater in the right eye affected by nonarteritic anterior ischemic optic neuropathy than in fellow eye. Therefore, these findings demonstrated that ONHD may determine significant ischemic events of the optic nerve and OCTA represents a valid and noninvasive tool in the diagnosis and in the pathogenesis of these rare cases of NAION associated to ONHD in young patients
A case series of Merkel cell carcinoma of the eyelid: a rare entity often misdiagnosed
No full textMerkel cell carcinoma (MCC) is one of the rarest eyelid tumors, with high mortality rate due to lymphatic and metastatic spread. We hereby report six cases of patients with histological diag- nosis of MCC referred to our Orbit Unit between 2012 and 2018, focusing on diagnosis, treatment, and subsequent follow up. All patients underwent surgical excision and systemic work-up. Both MCC TNM and eyelid MCC TNM were used to stage lesions. MCC of the eyelid is usually misdiagnosed as benign or other malignant lesions. A prompt examination and a wide local excision are mandatory. A close follow-up of these patients is advised due to high recurrence rate and lymphatic sprea
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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