Conclusion
Not all is about tuberculosis in sub-Saharan Africa. We describe an original report of a giant mature cyst teratoma that required excision with left lung decortication in a young female Congolese after she has been treated twice as having pulmonary tuberculosis. This is the first documented case in the region. Diagnosis is difficult via non-invasive procedure but clinicians should bear it in mind as a differential diagnosis to avoid delaying surgery.