Correct Answer: C. Microdochectomy
Microdochectomy is the surgical excision of a single lactiferous duct that is discharging pathological fluid (blood, serosanguinous, or purulent discharge). The procedure involves: (1) identification of the discharging duct orifice on the nipple-areola complex, (2) insertion of a probe into the duct to guide dissection, (3) a tennis racquet (or circumareolar) incision to access the duct, (4) careful dissection of the duct from surrounding breast tissue, and (5) complete excision of the affected duct. This is a conservative, duct-preserving approach used when a single duct shows pathological discharge—typically from intraductal papilloma, duct ectasia, or early malignancy. The term "micro" refers to excision of a single duct, as opposed to macrodochectomy (excision of multiple ducts). In Indian breast surgery practice, microdochectomy is the gold standard for managing single-duct discharge and allows histopathological examination to rule out malignancy while preserving breast tissue and lactation potential. The tennis racquet incision provides adequate exposure while maintaining cosmesis.
Why the other options are wrong
A. Cone excision — Cone excision refers to removal of a cone-shaped segment of tissue, typically used in cervical pathology (cervical intraepithelial neoplasia) or occasionally in breast lesions near the nipple. It is NOT the standard terminology for duct excision and does not specifically describe the probe-guided, single-duct removal described in the stem. This is a distractor that confuses breast surgery with gynecological terminology. B. Wide excision of the lactiferous duct — While 'wide excision' implies removal of the duct, it lacks the specificity and precision of the term 'microdochectomy.' Wide excision typically suggests removal of a larger volume of tissue with wider margins, which is not the goal in single-duct discharge. The procedure described is selective and limited to one duct, not a wide/extensive excision. This term is vague and not standard breast surgical nomenclature. D. Macrodochectomy — Macrodochectomy refers to excision of multiple lactiferous ducts (typically 4–6 ducts) and is performed for diffuse, multi-duct discharge (as in duct ectasia or fibrocystic disease affecting the entire nipple-areola complex). The clinical scenario describes a single discharging duct with a probe inserted into it, which is the hallmark of microdochectomy. Macrodochectomy would be inappropriate and over-treatment in this case.
High-Yield Facts
- Microdochectomy = excision of a single lactiferous duct with pathological discharge; macrodochectomy = excision of multiple ducts (4–6).
- Tennis racquet incision (circumareolar) is the standard approach for microdochectomy; provides access while maintaining cosmesis.
- Probe insertion into the discharging duct guides dissection and ensures complete removal of the affected duct.
- Indications for microdochectomy: single-duct discharge (blood, serosanguinous, purulent) from intraductal papilloma, duct ectasia, or suspected malignancy.
- Histopathology of excised duct is mandatory to exclude malignancy; microdochectomy is both therapeutic and diagnostic.
- Duct-preserving procedure: microdochectomy maintains lactation potential and breast tissue, unlike total mastectomy or wide excision.
Mnemonics
MICRO vs MACRO Dochectomy MICRO = Minor/Multiple-duct-NO (single duct only) | MACRO = Multiple ducts (4–6). Use: When you see 'single duct discharge' → microdochectomy; 'diffuse multi-duct discharge' → macrodochectomy. Tennis Racquet = Microdochectomy Tennis racquet incision (circumareolar) + probe-guided single-duct excision = Microdochectomy. Remember: the incision shape is your clue to the procedure name.
NBE Trap
NBE pairs the tennis racquet incision with 'wide excision' to trap students who confuse the precision of single-duct removal with the broader concept of 'wide' tissue excision. The key discriminator is single duct (micro) vs. multiple ducts (macro).
Clinical Pearl
In Indian breast clinics, a woman presenting with blood-stained discharge from a single duct orifice is a classic presentation for intraductal papilloma. Microdochectomy is the definitive procedure—it removes the offending duct, allows histology to exclude malignancy, and preserves the breast. This is far more common than macrodochectomy in routine practice.
_Reference: Bailey & Love's Short Practice of Surgery, Ch. 52 (Breast); Sabiston Textbook of Surgery, Ch. 36 (Breast Disorders)_