Characteristics of pulmonary tuberculosis and extrapulmonary tuberculosis in immunocompetent adults

Objective: While tuberculosis is primarily considered a pulmonary disease, it has the potential to infect almost every organ via lymphohematogenous dissemination during the initial pulmonary infection. The aim of this study was to explore the importance of demographics, clinical characteristics and the various patterns of extrapulmonary tuberculosis among Saudi and non Saudi patients presenting to King Fahd Hospital of the University, Alkhobar, in the Eastern Province of Saudi Arabia. Methods: Prospective study of all adult patients (13 years of age and above) with tuberculosis over a period of 9 years between 1997 and 2005. Results: A total of 390 cases of tuberculosis were diagnosed during the 9-year period. There were 221 Saudis (57%), and 169 non-Saudis (43%). Pulmonary tuberculosis (PTB) was diagnosed in 132 cases (33 %), extrapulmonary tuberculosis (EPTB) in 244 cases (63%), and both pulmonary and extrapulmonary in 14 cases (4%). The proportion of EPTB was similar among Saudi and non Saudi patients. Constitutional symptoms were more common among PTB than EPTB patients. Lymphadenopathy was the most frequent site of involvement. Of the 244 EPTB patients, 113 (45%) had lymphadenopathy and more than half were located in the cervical region. Osteoarticular tuberculosis noted in 41 patients (17%) was the second most frequent involvement. Pleural, peritoneal, miliary, genitourinary, and central nervous system tuberculosis, each accounted for 2%10% of the total number of cases of EPTB. Co-morbidities were found in 56 patients, 12% from EPTB, and 16% from PTB. Human immunodeficiency virus test results were available for 234 patients; all were found to be seronegative. Conclusion: Extrapulmonary tuberculosis remains frequent even in patients lacking risk factors. Dealing with EPTB has been hampered by the absence of a quick and accurate diagnostic tool. Because the clinical presentation of EPTB is extremely variable, a high level of suspicion is required to diagnose and treat EPTB in a timely and health-preserving manner.