The skeletal muscles are rarely affected by tuberculosis because they are not a favorable site for the survival and multiplication of Mycobacterium tuberculosis. A case of tuberculous abscess in rectus abdominis muscle is described in a 20-year-old female in an apparently healthy individual without any past history of tuberculosis. The diagnosis was made by ultrasound-guided fine-needle aspiration and cytological examination which revealed caseating granuloma with central necrosis, lymphocytes, and giant cells, consistent with tuberculosis. After four weeks' antituberculous treatment, she responded well and the abscess regressed considerably. In most cases, the muscle involvement is secondary and is caused by either hematogenous route or direct inoculation from a tuberculous abdominal lymph node or extension from underlying tubercular synovitis and osteomyelitis. This case cautions the clinicians and radiologists about the possibility of tuberculosis in considering the differential diagnosis of any lesion even in any unlikely anatomical area, especially in those areas where tuberculosis is endemic.Laboratory investigation revealed: hemoglobin 11.5 g/dl; total leukocyte count 8510/cumm with a differential count of 54% neutrophils, 42% lymphocytes and 4% eosinophils; Erythrocyte Sedimentation Rate 70 mm and ELISA for HIV negative. The chest radiograph was unremarkable. Other biochemical blood investigations were within normal limits. Ultrasonography of the abdomen revealed a 6.5x8.5cm left iliac fossa cystic mass with a liquefied necrotic center in the anterior abdominal wall (Figure 1). Computerized Tomography scan of the abdomen showed an abscess in the left antero-lateral portion of the abdominal wall limited to the muscle layer (Figure 2). Ultrasound-guided fine-needle aspiration and cytological examination revealed caseating granuloma with central necrosis, lymphocytes, and giant cells, consistent with tuberculosis ( Figure 3). The patient was diagnosed to have tuberculous abscess of the anterior abdominal wall and antituberculosis treatment was started. She improved rapidly over the next few days. After four weeks' antituberculous treatment (ATT), she responded well to the
IntroductionThe skeletal type of muscles are rarely affected by tuberculosis (TB) because they are not a preferred site for the survival and multiplication of Mycobacterium tuberculosis [1]. Even in patients with widespread involvement by the disease, tuberculosis rarely involves muscles. Petter et al. recorded only one case of primary skeletal muscles tuberculosis in over 8,000 cases of all types of tuberculosis, with an incidence of 0.015% [2]. Few cases of tubercular myositis have been described in literature till now, mostly in the adults. This, together with the decline in tuberculosis in general, makes it unlikely that one would immediately consider tuberculosis as the cause of rectus sheath abscess.There are only limited cases reports of isolated tubercular involvement of the anterior abdominal wall even though tuberculosis ...