Fine needle aspiration cytology of primary mucormycosis of the breast in a young immunocompetent pregnant woman

Mucormycosis: Cytomorphological Spectrum in Fine-Needle Aspiration Cytology

Background

Mucormycosis is a fungal infection that can affect multiple organs. The role of fine-needle aspiration cytology (FNAC) in its diagnosis is not well documented.

Aim

The objective of this study was to describe the detailed cytomorphologic features of mucormycosis on FNAC samples.

Materials and Methods

A retrospective analysis of all cases diagnosed as mucormycosis on FNAC between January 2014 and July 2021 was performed for detailed cytomorphological evaluation and correlation to clinical data and microbiological studies wherever available. FNA was computed tomography-guided (n = 38), ultrasonography-guided (n = 31) or palpation-guided (n = 12), and slides were reviewed in two cases.

Results

A total of 83 cases of mucormycosis were evaluated. An immunocompromised setting was observed in 48 cases. The most common site of FNA was the lung (n = 57) followed by liver, soft tissue, palate, mediastinum, orbital/ocular region, and lymph node. Isolated renal involvement, a unique feature, was seen in seven cases. The aspirates were necrotic to pus-like or blood-mixed particulate. Broad, nonseptate, foldable, ribbon-like fungal hyphae showing right-angled branching were seen. The tissue reaction was predominantly necro-inflammatory (n = 36), bland necrotic (n = 22), mixed inflammatory (n = 16), suppurative (n = 5), necrotizing granulomatous (n = 3), and granulomatous (n = 1). Immunocompromised patients showed mixed inflammatory responses more frequently. Fungal culture was positive for Rhizopus species in 2/13 cases and molecular testing in two additional cases corresponding to Rhizopus and Syncephalastrum spp.

Conclusion

FNA provides quick and conclusive diagnosis of mucormycosis from varied anatomic sites enabling prompt institution of therapy. The tissue response is variable and to some extent dependent on the immune status of the patient.

Breast Tuberculosis in Women: A Systematic Review

Breast tuberculosis (TB) is rarely reported and poorly described. This review aims to update the existing literature on risk factors, clinical presentations, constitutional symptoms, diagnostic procedures, and medical and surgical treatments for breast TB. In all, 1,478 cases of breast TB were collected. Previous history of TB was reported in 19% of cases. The most common clinical appearance of the lesion was breast lump (75%). The most common associated finding was axillary lymphadenitis (33%) followed by sinus or fistula (24%). The most common symptoms were pain and fever, reported in 42% and 28% of cases, respectively. The most used diagnostic method was fine-needle aspiration cytology (32%), followed by biopsy (27%), acid-fast bacteria Ziehl-Neelsen stain (26%), culture (13%), and polymerase chain reaction (2%). These tested positive in 64%, 93%, 27%, 26%, and 58% of cases, respectively. The majority (69%) of patients received a 6-month anti-TB treatment (isoniazid, rifampicin, pyrazinamide, and ethambutol). Surgery consisted of excision in 39% of cases, drainage in 23%, and mastectomy in 5%. The great majority of patients had a positive outcome. It often mimics breast cancer, which makes it difficult to diagnose. Most patients, when diagnosed in time, respond to antitubercular therapy alone.