RESUMEN
BACKGROUND: Fibrous dysplasia (FD) and ossifying fibroma (OF) are benign fibro-osseous lesions (FOLS) that are generally considered to be separate entities distinguishable by histologic and radiographic features. The histological maturation of these lesions involves an initial fibrous state, an intermediate mixed and a final mineralised stage. OBJECTIVE: To correlate the mineralisation of OF and FD with the duration of the lesion. DESIGN: A retrospective histopathological analysis of archival material including sixteen cases documented over a three-year period was performed to distinguish FD from OF. SETTING: The relevant data of FOLs diagnosed as OF and FD were retrieved from the archival records of the Departments of Oral Surgery/Oral Pathology and Histopathology/Morbid Anatomy, Muhimbili University of Health and Allied Sciences. RESULTS: Remarkably, in this series, none of the FD and OF lesions occurred in patients aged below 10 or over 50 years. The histopathological comparison of the various non-mineralised components in both the lesions in relation to lesion age-maturity was not statistically significant (P>0.05). CONCLUSION: The histopathological ratio of the mineralised to non-mineralised components may not be directly indicative of the maturity of both OF and FD.
Asunto(s)
Neoplasias Óseas/patología , Fibroma Osificante/patología , Displasia Fibrosa Ósea/patología , Adolescente , Adulto , Factores de Edad , Niño , Femenino , Humanos , Masculino , Persona de Mediana Edad , Estudios Retrospectivos , Adulto JovenRESUMEN
Objective: The objective of the study was to study the histological pattern of intracranial meningiomas; provide a comprehensive data about its frequency in both adults and children and to correlate the site of the tumour with histological diagnosis. Design: A descriptive study. Place and duration of study: The study was carried out at the departments of Histopathology and Morbid Anatomy; Muhimbili National Hospital and Neurosurgery; Muhimbili Orthopaedic Institute in Tanzania; over a period of seven years (1998 to October 2004). Patients and methods :The histopathological data of 54 intracranial meningiomas of adults and children was evaluated on H et E stained sections of paraffin embedded tissue. Results: The ages ranged from 6 to 87 years with mean of 36.6 years. The male to female ratio was 1:1. All histological subtypes of meningiomas were in WHO grade I category and meningotheliomatous type comprised the largest subtype (37). Others were transitional (25.9); fibroblastic (22.2); angiomatous (7.4); psamommatous (5.6) and microcystic (1.9). Out of 54 meningiomas; 43 (79.6) were supratentorial and 11 (20.4) were infratentorial in location. Meningotheliomatous meningioma was the commonest histological subtype in supratentorial region (41.9) while in infratentorial region fibroblastic and transitional subtypes were the commonest (36.4each). Conclusion: All meningioma were in WHO grade I category and meningotheliomatous was the commonest overall and also the most predominant in the supratentorial region while in infratentorial location transitional and fibroblastic subtypes were the commonest with equal frequency. Meningioma gave an equal gender ratio in our study
Asunto(s)
Neoplasias Encefálicas , Identidad de Género , Meningioma/fisiopatologíaRESUMEN
Objective: The objective of the present study was to study the histopathological pattern of intracranial tumours and to provide a comprehensive data about their frequency in adults and children less than 16 years and to correlate the site with histological diagnosis.Design: A descriptive studyPlace and duration of study: The study was carried out at the departments of Histopathology and Morbid Anatomy; Muhimbili National Hospital and Neurosurgery; Muhimbili Orthopaedic Institute in Tanzania; over a period of seven years (1998- October 2004).Patients and Methods: The histopathological data of 104 brain tumours of all adults and children less than 16 years histopathologically evaluated was performed on H et E stained sections of paraffin embedded tissue. Special stains were performed whenever indicated.Results: The ages ranged from 2 to 90 years with an overall mean of 34.4 years while that of children below 16 years was 9.5 years and in adults was 41.9 years. The male to female ratio was 1.2:1. Meningiomas comprised the largest category (51.9) and Glial tumours ranked the second (21.4) of primary brain tumours and among all gliomas astrocytomas were the commonest comprising of 16.4 of all intracranial neoplasms. Out of 104 brain tumours; 83(79.8) were supratentorial and 21(20.2) were infratentorial in location while in adults 72(84.7) were in supratentorial region and 13(15.3) were in infratentorial region. In children below 16 years; 11(57.9) and 8(42.1) were in supratentorial and infratentorial in location respectively. The most common tumour overall in both supratentorial and infratentiorial regions were meningiomas (53) and all were in WHO grade I. When age was taken in consideration; meningiomas remained the commonest supratentorial tumours in adult (56.9) while in children below 16 years; cranioparyngioma was the commonest supratentorial neoplasm (45.4). In children less than 16 years medulloblastoma and pilocytic astrocytoma were the commonest neoplasms in the infratentorial region (37.5 of each).Conclusion: Meningioma was the commonest intracranial tumour overall in both supratentorial and infratentorial locations. However medulloblastoma and pilocytic astrocytoma were the most common tumours in the infratentorial region in children below 16 years of age
Asunto(s)
Adulto , Astrocitoma , Neoplasias Encefálicas/fisiopatología , Niño , Meduloblastoma , MeningiomaRESUMEN
Histology of 378 appendicectomy specimens submitted to the Histopathology Department of Muhimbili Medical Centre from its surgical wards over a 10 year period (1985 to 1994) were reviewed. There were 185 cases (48.9 pc) of acute appendicitis, 101 cases (26.7 pc) of chronic appendicitis, 74 (19.6 pc) normal appendices and 13 cases (3.5 pc) schistosomal appendicitis. There were two cases of tuberculous appendicitis and two cases of mucocele of the appendix. Apart from the high frequency of chronic appendicitis the histological findings in this study compare well with findings reported from other studies.