Biomedical subjects

Antonio Augusto Velasco Cruz

Publications and source records attributed to Antonio Augusto Velasco Cruz.

6 recordsLinked to original sources

PubMed2006

Extraocular muscle quantification using mathematical morphology: a semi-automatic method for analyzing muscle enlargement in orbital diseases.

Mathematical morphology was used to quantify the dimensions of the human extraocular muscles in computed tomography orbital scans. Coronal images of 28 patients with Graves orbitopathy and 5 controls (218 orbital scans) were analyzed with an algorithm for extraocular muscle segmentation. The results showed that measurements of extraocular muscle area obtained with semi-automatic segmentation are highly correlated with manual tracing and provides a simple method to quantify orbital structures including the extraocular muscles.

Algorithms↗

PubMed2006

Atypical pneumococcal scleritis after pterygium excision: case report and literature review.

PURPOSE: To describe an unusual case of pneumococcal scleritis after pterygium excision and to review the literature on infectious scleritis associated with pterygium excision. METHODS: Case report and literature review. RESULTS: A 58-year-old white man underwent excision of a nasal pterygium of the right eye. Two weeks postoperatively, the patient developed an infectious scleritis caused by Streptococcus pneumoniae. The scleritis was complicated with hypopyon and a scleral necrosis area 6 mm away from the superior limbus with a positive Seidel test. Topical and systemic antibiotics resolved the case without any surgical procedures. CONCLUSION: Streptococcus pneumoniae must be considered as a possible agent in cases of necrotizing scleritis associated with pterygium excision.

Anti-Bacterial Agents↗

PubMed2005

Management of enophthalmos and superior sulcus deformity induced by the silent sinus syndrome.

BACKGROUND: Silent sinus syndrome is a dysfunction of the maxillary sinus that induces a progressive and asymptomatic enophthalmos with prominent deep superior sulcus deformity. METHODS: Two cases of silent sinus syndrome are reported, and the simultaneous management of both enophthalmos and superior sulcus deformity caused by this syndrome is discussed. RESULTS: The patients underwent surgical endoscopic maxillary meatotomy and transconjunctival subperiosteal implantation of porous polyethylene sheets. The treatment successfully corrected both the enophthalmos and the upper eyelid sulcus deformity. However, small degrees of vertical eye dystopia were observed. CONCLUSIONS: Silent sinus syndrome is a rare cause of enophthalmos and superior sulcus deformity. Orbital floor implants can be used to increase the volume of the orbital contents, but vertical eye dystopia is likely to be induced if this method of treatment is the only option chosen.

Adult↗

PubMed2005

Adult blindness secondary to vitamin A deficiency associated with an eating disorder.

OBJECTIVE: We examined an adult patient who lost one eye due to severe keratomalacia secondary to self-induced vitamin A deficiency. METHODS: This case report provides a clinical, ophthalmologic, and laboratory description in addition to a review of the medical literature. RESULTS: A 33-y-old woman with a 17-y history of an eating disorder presented with bilateral conjunctival xerosis, an infected corneal ulcer in the right eye and a large descemetocele in the left eye. Laboratory and clinical findings were consistent with vitamin A deficiency. Despite a tectonic penetrating keratoplasty, her left eye perforated and had to be eviscerated. In parallel, vitamin A replacement improved her clinical status and the ocular findings in her right eye. CONCLUSIONS: The present report indicates that vitamin A deficiency secondary to eating disorders should be considered in the differential diagnosis of patients with severe dry eye and corneal ulceration.

Adult↗

PubMed2004

Intraosseous hemangioma of the lateral orbital wall.

PURPOSE: To report the clinical and radiologic features of two patients with intraosseous orbital hemangiomas of the lateral wall. METHODS: Case reports and literature review. RESULTS: The first patient presented with an indolent mass over the lateral orbital rim. Intraosseous hemangioma was not considered in the differential diagnosis. A biopsy specimen was taken from the tumor, which caused significant bleeding. After biopsy, an orbital CT scan revealed a lesion involving the left lateral orbital rim and soft tissue of the temporal fossa. The rim was grossly enlarged, with several cavities of different sizes. The tumor of the second patient was located more posteriorly and extended into the roof. The patient complained of parietal headache, epiphora, and local pain. A CT scan revealed a round, lytic lesion involving the greater sphenoid wing and frontal bone. The tumor was approached through a coronal flap and resected en bloc without problems. CONCLUSIONS: The diagnosis of intraosseous hemangioma can be difficult, especially when tumors are located in the anterior part of the lateral wall. In this location, intraosseous hemangiomas tend to induce few symptoms and thus have a higher likelihood of biopsy being performed before a correct diagnosis. A CT scan with bone windows can play a beneficial role in the evaluation of lytic bone lesions in intraosseous hemangioma.

Adult↗

PubMed2002

Trachoma and ethnic diversity in the Upper Rio Negro Basin of Amazonas State, Brazil.

A trachoma survey was carried out among three culturally different populations of the Upper Rio Negro Basin in the Brazilian rain forest of Amazonas State. The results indicate that trachoma is prevalent in the region, reaching hyperendemic levels (between 50.9% and 56.4%) in all communities studied. However, the severity of the disease appears to be related to the ethnic origin of the tribes, following the rank of social and cultural values that regulate the complex interactions between the Indian groups of the region.

Adult↗