Simon Classification — Matching Grade to Technique

The Simon classification (Simon, Hoffman & Kahn, 1973) is the most widely used grading system for gynecomastia. Five decades after its publication it remains clinically relevant because it directly maps severity to surgical technique. This guide walks through each grade, the physical findings that distinguish them, and the technique typically indicated for each.

Grade I — Minor enlargement, no skin excess

The subtlest presentation. A small button of glandular tissue (typically 2–4 cm in diameter) lies directly behind the nipple-areolar complex, often with a modest surrounding fat component. Skin envelope is appropriate to the reduced contour after tissue removal — no skin excess, no nipple displacement. Often missed clinically until the patient points it out.

Physical findings:

• Pinch test at the areolar border reveals a firm disc 1.5–3 cm thick
• No visible deformity in loose clothing
• Patient often self-diagnoses from training photos or beach photos
• Nipple position anatomically correct

Recommended technique: Liposuction (if predominantly fat) or pull-through technique (if significant fibrous gland). The pull-through avoids a formal periareolar incision while still addressing the gland.

Grade IIa — Moderate enlargement, no skin excess

The most common presentation in adult men and the technical "sweet spot" for gynecomastia surgery. Clear visible protrusion (the patient avoids fitted shirts, bench press photos, etc.), mixed glandular-fatty composition, but skin tone remains sufficient to retract after tissue removal.

Physical findings:

• Visible fullness in the chest, worse when leaning forward
• Glandular disc 4–6 cm, sometimes with a "puffy nipple" appearance
• Skin still elastic — pinch returns promptly
• Nipple position acceptable

Recommended technique: Pull-through technique for mixed composition, or formal gland excision via inferior periareolar incision if the gland is dense / fibrous. Liposuction is the adjunct, not the primary modality in true Grade IIa.

Grade IIb — Moderate enlargement with minor skin excess

The borderline grade — sometimes called "2b" in shorthand. Tissue volume is similar to IIa but skin has stretched slightly beyond its elastic capacity. Skin will partially retract after resection, but not to the ideal male chest contour. Conservative periareolar skin excision delivers a better final result than relying on retraction alone.

Physical findings:

• Visible protrusion with early inferior pole laxity
• Minor "drooping" appearance when upright, less obvious supine
• Pinch test shows slightly slow skin recoil
• Nipple position still within acceptable male range (above inframammary fold line)

Recommended technique: Gland excision via periareolar incision, combined with conservative crescent-shaped skin excision at the inferior areolar border to tighten and slightly lift the nipple-areolar complex. Approximately 2–4 mm of skin removal is typical.

Grade III — Marked enlargement with significant skin excess

True breast-like appearance with glandular ptosis (sagging) and inferior displacement of the nipple-areolar complex below the inframammary fold. Skin excess is significant and does not retract meaningfully. The operation becomes a skin-driven case rather than a gland-driven one.

Physical findings:

• Breast-like fullness with ptotic inferior pole
• Nipple below inframammary crease line when assessed supine
• Significant skin excess on pinch test, no meaningful recoil
• Often after massive weight loss or longstanding disease

Recommended technique: Gland excision combined with formal skin excision and nipple-areolar repositioning. Incision pattern is commonly circumareolar (for mild Grade III) or a modified vertical/anchor pattern (for severe Grade III) — borrowing from the breast reduction surgical vocabulary. This is the only grade where an obvious surgical scar is anatomically unavoidable.

Grade summary table

Alternative classifications

Several other systems exist; Simon remains the most cited. Rohrich (2003) proposed a modified system incorporating tissue composition (glandular vs. adipose dominant) as a separate axis — useful in research contexts. Cordova-Moschella (2008) emphasised the role of the inframammary fold and nipple position for Grade III planning. Most working surgeons use Simon as the base language and mentally apply Rohrich's glandular/adipose distinction when planning.