Kamla, a 30-yr-old lady examined for infertility by hysterosalpingography, reveals 'Bead - like' fallopian tube and clubbing of ampulla. The most likely cause is:

The following findings on hysterosalpingogram strongly suggest tubercular salpingitis: • A rigid nonperistaltic pipe like tube, called lead pipe appearance • Beading and variation in filling density • Calcification of the tube • Cornual block • A jagged fluffiness of the tubal outline • Vascular or lymphatic intravasation of the dye • Tobacco-pouch appearance seen on naked eye examination. Also Note: • In a proven case of genital tuberculosis, hysterosalpingography is contraindicated as it may spread the infection. • In TB Endometritis on HSG: The uterine cavity is shrivelled and obliterated by adhesions giving honeycomb appearance. • On USG: Incomplete septation of the tubal wall “Cogwheel sign” is a marker for acute disease. Thin wall and beaded string appearance is a marker for chronic disease.